Pinvoke help

[Ringo]

the LeafProject http://www.leafproject.org has a DLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;
namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo
System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa feNativeMethods .IMsoComponentM anager.FPushMes sageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()

[Nicholas Paldino [.NET/C# MVP]]

Can you show the header file for C++ to access this? You woud probably
have more people able to help if you provided that, and it would be easier
to show you the declarations you would need.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Ringo" <ri*********@gm ail.comwrote in message
news:11******** **************@ n59g2000hsh.goo glegroups.com.. .

the LeafProject http://www.leafproject.org has a DLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;
namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo
System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa feNativeMethods .IMsoComponentM anager.FPushMes sageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()

[Ringo]

I jsut got the .H file used. i was going by the LISP code. I'm not a C+
+ guy at all, but I don't see anything in the .H file that has to do
with the function names called. Am I missing somethign here?
// FaceRecog.h : main header file for the FACERECOG DLL
//

#if !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)
#define
AFX_FACERECOG_H __484912E7_8723 _407A_91D6_39A2 4AD3B3E4__INCLU DED_

#if _MSC_VER 1000
#pragma once
#endif // _MSC_VER 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h " // main symbols

/////////////////////////////////////////////////////////////////////////////
// CFaceRecogApp
// See FaceRecog.cpp for the implementation of this class
//

class CFaceRecogApp : public CWinApp
{
public:
CFaceRecogApp() ;

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(C FaceRecogApp)
public:
//}}AFX_VIRTUAL

//{{AFX_MSG(CFace RecogApp)
// NOTE - the ClassWizard will add and remove member functions here.
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_MSG
DECLARE_MESSAGE _MAP()
};
/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LO CATION}}
// Microsoft Visual C++ will insert additional declarations
immediately before the previous line.

#endif // !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)
On May 7, 1:20 pm, "Nicholas Paldino [.NET/C# MVP]"
<[e-mail] d.caspershouse. comwrote:

Can you show the header file for C++ to access this? You woud probably
have more people able to help if you provided that, and it would be easier
to show you the declarations you would need.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ n59g2000hsh.goo glegroups.com.. .

the LeafProjecthttp ://www.leafproject .orghas a DLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;

namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo

System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa *feNativeMethod s.IMsoComponent Manager.FPushMe ssageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()- Hide quoted text -

- Show quoted text -

[Ringo]

On May 7, 1:29 pm, Ringo <ringo.da...@gm ail.comwrote:

I jsut got the .H file used. i was going by the LISP code. I'm not a C+
+ guy at all, but I don't see anything in the .H file that has to do
with the function names called. Am I missing somethign here?

// FaceRecog.h : main header file for the FACERECOG DLL
//

#if !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)
#define
AFX_FACERECOG_H __484912E7_8723 _407A_91D6_39A2 4AD3B3E4__INCLU DED_

#if _MSC_VER 1000
#pragma once
#endif // _MSC_VER 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h " // main symbols

///////////////////////////////////////////////////////////////////////////*//
// CFaceRecogApp
// See FaceRecog.cpp for the implementation of this class
//

class CFaceRecogApp : public CWinApp
{
public:
CFaceRecogApp() ;

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(C FaceRecogApp)
public:
//}}AFX_VIRTUAL

//{{AFX_MSG(CFace RecogApp)
// NOTE - the ClassWizard will add and remove member functions here.
// DO NOT EDIT what you see in these blocks of generated code !
//}}AFX_MSG
DECLARE_MESSAGE _MAP()

};

///////////////////////////////////////////////////////////////////////////*//

//{{AFX_INSERT_LO CATION}}
// Microsoft Visual C++ will insert additional declarations
immediately before the previous line.

#endif // !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)

On May 7, 1:20 pm, "Nicholas Paldino [.NET/C# MVP]"

<[e-mail] d.caspershouse. comwrote:

Can you show the header file for C++ to access this? You woud probably
have more people able to help if you provided that, and it would be easier
to show you the declarations you would need.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ n59g2000hsh.goo glegroups.com.. .

the LeafProjecthttp ://www.leafproject .orghasa DLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;

namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo

System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa **feNativeMetho ds.IMsoComponen tManager.FPushM essageLoop(Int3 2
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()- Hide quoted text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Also here are the definitions at the begginning of the .cpp file
extern "C" __declspec(dlle xport) int GetNum();
extern "C" __declspec(dlle xport) int DoEigen();
extern "C" __declspec(dlle xport) int LookForFaces(ch ar* place);
extern "C" __declspec(dlle xport) int AddFace();
extern "C" __declspec(dlle xport) int StartCamera();
extern "C" __declspec(dlle xport) int StopCamera();

[Dave Shooter]

Hi Ringo

I don't know for sure if the argument to the DllImportAttrib ute is case
sensitive or not, but I notice that the first one is in lower case in
your code:

[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();

Ringo wrote:

the LeafProject http://www.leafproject.org has a DLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;
namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo
System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa feNativeMethods .IMsoComponentM anager.FPushMes sageLoop(Int32

dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()

[Ringo]

On May 7, 2:15 pm, Dave Shooter
<alwayskeepitlo aded@delete_thi s.googlemail.co mwrote:

Hi Ringo

I don't know for sure if the argument to the DllImportAttrib ute is case
sensitive or not, but I notice that the first one is in lower case in
your code:

[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();

Ringo wrote:

the LeafProjecthttp ://www.leafproject .orghas a DLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;

namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo

System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa *feNativeMethod s.IMsoComponent Manager.FPushMe ssageLoop(Int32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()- Hide quoted text-

- Show quoted text -

I've tried uppercase, lowercase, etc. I copied the name of the file
directly from the file itself and pasted that to be sure and still get
the same error. I have commented out all the other pinvokes except the
start camera and it still crashes. Must be something I'm missing. any
other ideas?
Ringo

[Nicholas Paldino [.NET/C# MVP]]

Have you tried hard-coding the path to the dll just to see if it works?
Also, is the facerecog.dll stand-alone? If so, place it in the same
directory as your application and it should work.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Ringo" <ri*********@gm ail.comwrote in message
news:11******** **************@ h2g2000hsg.goog legroups.com...
On May 7, 1:29 pm, Ringo <ringo.da...@gm ail.comwrote:

I jsut got the .H file used. i was going by the LISP code. I'm not a C+
+ guy at all, but I don't see anything in the .H file that has to do
with the function names called. Am I missing somethign here?

// FaceRecog.h : main header file for the FACERECOG DLL
//

#if !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)
#define
AFX_FACERECOG_H __484912E7_8723 _407A_91D6_39A2 4AD3B3E4__INCLU DED_

#if _MSC_VER 1000
#pragma once
#endif // _MSC_VER 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h " // main symbols

///////////////////////////////////////////////////////////////////////////*//
// CFaceRecogApp
// See FaceRecog.cpp for the implementation of this class
//

class CFaceRecogApp : public CWinApp
{
public:
CFaceRecogApp() ;

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(C FaceRecogApp)
public:
//}}AFX_VIRTUAL

//{{AFX_MSG(CFace RecogApp)
// NOTE - the ClassWizard will add and remove member
functions here.
// DO NOT EDIT what you see in these blocks of
generated code !
//}}AFX_MSG
DECLARE_MESSAGE _MAP()

};

///////////////////////////////////////////////////////////////////////////*//

//{{AFX_INSERT_LO CATION}}
// Microsoft Visual C++ will insert additional declarations
immediately before the previous line.

#endif // !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)

On May 7, 1:20 pm, "Nicholas Paldino [.NET/C# MVP]"

<[e-mail] d.caspershouse. comwrote:

Can you show the header file for C++ to access this? You woud
probably
have more people able to help if you provided that, and it would be
easier
to show you the declarations you would need.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ n59g2000hsh.goo glegroups.com.. .

the LeafProjecthttp ://www.leafproject .orghasa DLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;

namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo

System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa **feNativeMetho ds.IMsoComponen tManager.FPushM essageLoop(Int3 2
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()- Hide quoted
text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Also here are the definitions at the begginning of the .cpp file
extern "C" __declspec(dlle xport) int GetNum();
extern "C" __declspec(dlle xport) int DoEigen();
extern "C" __declspec(dlle xport) int LookForFaces(ch ar* place);
extern "C" __declspec(dlle xport) int AddFace();
extern "C" __declspec(dlle xport) int StartCamera();
extern "C" __declspec(dlle xport) int StopCamera();

[Ringo]

I've tried somethign like
[DllImport("c:\W indows\system32 \FaceRecog.dll" )]
public static extern int StartCamera();

But it did not like the "\"'s.

I also tried putting the dll where the .sln file goes and down 1
directory where the rest of the files go and got the same result.
still no luck.

On May 7, 2:39 pm, "Nicholas Paldino [.NET/C# MVP]"
<[e-mail] d.caspershouse. comwrote:

Have you tried hard-coding the path to the dll just to see if it works?
Also, is the facerecog.dll stand-alone? If so, place it in the same
directory as your application and it should work.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ h2g2000hsg.goog legroups.com...
On May 7, 1:29 pm, Ringo <ringo.da...@gm ail.comwrote:

I jsut got the .H file used. i was going by the LISP code. I'm not a C+
+ guy at all, but I don't see anything in the .H file that has to do
with the function names called. Am I missing somethign here?

// FaceRecog.h : main header file for the FACERECOG DLL
//

#if !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)
#define
AFX_FACERECOG_H __484912E7_8723 _407A_91D6_39A2 4AD3B3E4__INCLU DED_

#if _MSC_VER 1000
#pragma once
#endif // _MSC_VER 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h " // main symbols

///////////////////////////////////////////////////////////////////////////**//
// CFaceRecogApp
// See FaceRecog.cpp for the implementation of this class
//

class CFaceRecogApp : public CWinApp
{
public:
CFaceRecogApp() ;

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(C FaceRecogApp)
public:
//}}AFX_VIRTUAL

//{{AFX_MSG(CFace RecogApp)
// NOTE - the ClassWizard will add and remove member
functions here.
// DO NOT EDIT what you see in these blocks of
generated code !
//}}AFX_MSG
DECLARE_MESSAGE _MAP()

};

///////////////////////////////////////////////////////////////////////////**//

//{{AFX_INSERT_LO CATION}}
// Microsoft Visual C++ will insert additional declarations
immediately before the previous line.

#endif // !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)

On May 7, 1:20 pm, "Nicholas Paldino [.NET/C# MVP]"

<[e-mail] d.caspershouse. comwrote:

Can you show the header file for C++ to access this? You woud
probably
have more people able to help if you provided that, and it would be
easier
to show you the declarations you would need.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

>news:11******* *************** @n59g2000hsh.go oglegroups.com. ..

the LeafProjecthttp ://www.leafproject .orghasaDLL for Face
recognition. it is written in C++ but they interface to it from Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;

namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo

System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender, EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage&m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa ***feNativeMeth ods.IMsoCompone ntManager.FPush MessageLoop(Int 32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()- Hide quoted
text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Also here are the definitions at the begginning of the .cpp file
extern "C" __declspec(dlle xport) int GetNum();
extern "C" __declspec(dlle xport) int DoEigen();
extern "C" __declspec(dlle xport) int LookForFaces(ch ar* place);
extern "C" __declspec(dlle xport) int AddFace();
extern "C" __declspec(dlle xport) int StartCamera();
extern "C" __declspec(dlle xport) int StopCamera();- Hide quoted text -

- Show quoted text -

[Nicholas Paldino [.NET/C# MVP]]

Ringo,

If the path to the DLL is this:

"c:\Windows\sys tem32\FaceRecog .dll"

Then your DllImport needs to be this:

[DllImport(@"c:\ Windows\system3 2\FaceRecog.dll ")]

Or this:
[DllImport("c:\\ Windows\\system 32\\FaceRecog.d ll")]

Also, you say you put the dll one directory down from where the .sln
file is, which would be the project directory, but that isn't where the
output EXE is built. Place it in that directory and see if it works without
the full path.
--
- Nicholas Paldino [.NET/C# MVP]
- mv*@spam.guard. caspershouse.co m

"Ringo" <ri*********@gm ail.comwrote in message
news:11******** **************@ o5g2000hsb.goog legroups.com...
I've tried somethign like
[DllImport("c:\W indows\system32 \FaceRecog.dll" )]
public static extern int StartCamera();

But it did not like the "\"'s.

I also tried putting the dll where the .sln file goes and down 1
directory where the rest of the files go and got the same result.
still no luck.

On May 7, 2:39 pm, "Nicholas Paldino [.NET/C# MVP]"
<[e-mail] d.caspershouse. comwrote:

Have you tried hard-coding the path to the dll just to see if it
works?
Also, is the facerecog.dll stand-alone? If so, place it in the same
directory as your application and it should work.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ h2g2000hsg.goog legroups.com...
On May 7, 1:29 pm, Ringo <ringo.da...@gm ail.comwrote:

I jsut got the .H file used. i was going by the LISP code. I'm not a C+
+ guy at all, but I don't see anything in the .H file that has to do
with the function names called. Am I missing somethign here?

// FaceRecog.h : main header file for the FACERECOG DLL
//

#if !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)
#define
AFX_FACERECOG_H __484912E7_8723 _407A_91D6_39A2 4AD3B3E4__INCLU DED_

#if _MSC_VER 1000
#pragma once
#endif // _MSC_VER 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h " // main symbols

///////////////////////////////////////////////////////////////////////////**//
// CFaceRecogApp
// See FaceRecog.cpp for the implementation of this class
//

class CFaceRecogApp : public CWinApp
{
public:
CFaceRecogApp() ;

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(C FaceRecogApp)
public:
//}}AFX_VIRTUAL

//{{AFX_MSG(CFace RecogApp)
// NOTE - the ClassWizard will add and remove member
functions here.
// DO NOT EDIT what you see in these blocks of
generated code !
//}}AFX_MSG
DECLARE_MESSAGE _MAP()

};

///////////////////////////////////////////////////////////////////////////**//

//{{AFX_INSERT_LO CATION}}
// Microsoft Visual C++ will insert additional declarations
immediately before the previous line.

#endif // !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)

On May 7, 1:20 pm, "Nicholas Paldino [.NET/C# MVP]"

<[e-mail] d.caspershouse. comwrote:

Can you show the header file for C++ to access this? You woud
probably
have more people able to help if you provided that, and it would be
easier
to show you the declarations you would need.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

>news:11******* *************** @n59g2000hsh.go oglegroups.com. ..

the LeafProjecthttp ://www.leafproject .orghasaDLL for Face
recognition. it is written in C++ but they interface to it from
Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face
detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;

namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following
message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo

System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender,
EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs
mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage&
m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage& m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa ***feNativeMeth ods.IMsoCompone ntManager.FPush MessageLoop(Int 32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at FaceRecognition .Program.Main() in e:\FaceRecognit ion
\FaceRecognitio n\Program.cs:li ne 17
at System.AppDomai n.nExecuteAssem bly(Assembly assembly,
String[] args)
at System.AppDomai n.ExecuteAssemb ly(String assemblyFile,
Evidence assemblySecurit y, String[] args)
at
Microsoft.Visua lStudio.Hosting Process.HostPro c.RunUsersAssem bly()
at System.Threadin g.ThreadHelper. ThreadStart_Con text(Object
state)
at System.Threadin g.ExecutionCont ext.Run(Executi onContext
executionContex t, ContextCallback callback, Object state)
at System.Threadin g.ThreadHelper. ThreadStart()- Hide quoted
text -

- Show quoted text -- Hide quoted text -

- Show quoted text -

Also here are the definitions at the begginning of the .cpp file
extern "C" __declspec(dlle xport) int GetNum();
extern "C" __declspec(dlle xport) int DoEigen();
extern "C" __declspec(dlle xport) int LookForFaces(ch ar* place);
extern "C" __declspec(dlle xport) int AddFace();
extern "C" __declspec(dlle xport) int StartCamera();
extern "C" __declspec(dlle xport) int StopCamera();- Hide quoted text -

- Show quoted text -

[Ringo]

I put it here
E:\FaceRecognit ion\FaceRecogni tion\bin\Debug
But still get the same error.

I also tried
[DllImport("c:\\ Windows\\system 32\\FaceRecog.d ll")]
and
[DllImport(@"c:\ Windows\system3 2\FaceRecog.dll ")]
but with the same error
On May 7, 3:32 pm, "Nicholas Paldino [.NET/C# MVP]"
<[e-mail] d.caspershouse. comwrote:

Ringo,

If the path to the DLL is this:

"c:\Windows\sys tem32\FaceRecog .dll"

Then your DllImport needs to be this:

[DllImport(@"c:\ Windows\system3 2\FaceRecog.dll ")]

Or this:

[DllImport("c:\\ Windows\\system 32\\FaceRecog.d ll")]

Also, you say you put the dll one directory down from where the .sln
file is, which would be the project directory, but that isn't where the
output EXE is built. Place it in that directory and see if it works without
the full path.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ o5g2000hsb.goog legroups.com...
I've tried somethign like
[DllImport("c:\W indows\system32 \FaceRecog.dll" )]
public static extern int StartCamera();

But it did not like the "\"'s.

I also tried putting the dll where the .sln file goes and down 1
directory where the rest of the files go and got the same result.
still no luck.

On May 7, 2:39 pm, "Nicholas Paldino [.NET/C# MVP]"

<[e-mail] d.caspershouse. comwrote:

Have you tried hard-coding the path to the dll just to see if it
works?
Also, is the facerecog.dll stand-alone? If so, place it in the same
directory as your application and it should work.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ h2g2000hsg.goog legroups.com...
On May 7, 1:29 pm, Ringo <ringo.da...@gm ail.comwrote:

I jsut got the .H file used. i was going by the LISP code. I'm not a C+
+ guy at all, but I don't see anything in the .H file that has to do
with the function names called. Am I missing somethign here?

// FaceRecog.h : main header file for the FACERECOG DLL
//

#if !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)
#define
AFX_FACERECOG_H __484912E7_8723 _407A_91D6_39A2 4AD3B3E4__INCLU DED_

#if _MSC_VER 1000
#pragma once
#endif // _MSC_VER 1000

#ifndef __AFXWIN_H__
#error include 'stdafx.h' before including this file for PCH
#endif

#include "resource.h " // main symbols

///////////////////////////////////////////////////////////////////////////***//
// CFaceRecogApp
// See FaceRecog.cpp for the implementation of this class
//

class CFaceRecogApp : public CWinApp
{
public:
CFaceRecogApp() ;

// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(C FaceRecogApp)
public:
//}}AFX_VIRTUAL

//{{AFX_MSG(CFace RecogApp)
// NOTE - the ClassWizard will add and remove member
functions here.
// DO NOT EDIT what you see in these blocks of
generated code !
//}}AFX_MSG
DECLARE_MESSAGE _MAP()

};

///////////////////////////////////////////////////////////////////////////***//

//{{AFX_INSERT_LO CATION}}
// Microsoft Visual C++ will insert additional declarations
immediately before the previous line.

#endif // !
defined(AFX_FAC ERECOG_H__48491 2E7_8723_407A_9 1D6_39A24AD3B3E 4__INCLUDED_)

On May 7, 1:20 pm, "Nicholas Paldino [.NET/C# MVP]"

<[e-mail] d.caspershouse. comwrote:
Can you show the header file for C++ to access this? You woud
probably
have more people able to help if you provided that, and it would be
easier
to show you the declarations you would need.

--
- Nicholas Paldino [.NET/C# MVP]
- [e-mail] .caspershouse.c om

"Ringo" <ringo.da...@gm ail.comwrote in message

news:11******** **************@ n59g2000hsh.goo glegroups.com.. .

the LeafProjecthttp ://www.leafproject .orghasaDLLfor Face
recognition. it is written in C++ but they interface to it from
Lisp.
I want to interface to it from C#.
Their Lisp definitions looks like this.

;;;; REGISTER THE VISION FACE RECOGNITION
DLL ;;;;;;;;;;;;;;; ;;;;;;;;;;;;;
(fli:register-module "FaceRecog.dll" )

; an interface function:
; -1 = ERROR: camera failed to start
; 0 = camera on successfully
(fli:define-foreign-function
(Start-Camera "StartCamer a")
()
:result-type :int)

; an interface function:
; -1 = ERROR: camera failed to stop
; 0 = camera off successfully
(fli:define-foreign-function
(Stop-Camera "StopCamera ")
()
:result-type :int)

; an interface function:
; returns the number of face images in the database
(fli:define-foreign-function
(Get-Number-Images "GetNum")
()
:result-type :int)

; an interface function:
; -2 = ERROR: write error
; -1 = ERROR: could not create values.txt file
; 0 = eigens created and stored successfully
(fli:define-foreign-function
(Calc-Eigens "DoEigen")
()
:result-type :int)

; an interface function
; -1 = ERROR: could not rename or add face
; 0 = face added sucessfully
(fli:define-foreign-function
(Add-Face "AddFace")
()
:result-type :int)

; an interface function
; -4 = ERROR: could not save face image
; -3 = ERROR: could not read coefficient file
; -2 = ERROR: could not capture
; -1 = ERROR: could not load classifier cascade
; 0 or more = number of faces detected... if only one face
detected,
then
; return string = image number as a string, eg. "6" means image 6
(fli:define-foreign-function
(Look-For-Faces "LookForFac es")
((return-string (:reference-return (:ef-mb-string :limit 256))))
:result-type :int
:lambda-list (&aux return-string)
:language :c
:calling-convention :cdecl
:result-type :int)

So from that I looked up Pinvoke and wrote this code.

using System;
using System.Collecti ons.Generic;
using System.Componen tModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows. Forms;
using System.Runtime. InteropServices ;

namespace FaceRecognition
{
public partial class Form1 : Form
{
[DllImport("face recog.dll")]
public static extern int StartCamera();
[DllImport("Face Recog.dll")]
public static extern int StopCamera();
[DllImport("Face Recog.dll")]
public static extern int GetNum();
[DllImport("Face Recog.dll")]
public static extern int DoEigen();
[DllImport("Face Recog.dll")]
public static extern int AddFace();
[DllImport("Face Recog.dll")]
public static extern int LookForFaces();

public Form1()
{
InitializeCompo nent();
}

private void Form1_Load(obje ct sender, EventArgs e)
{

}

private void button1_Click(o bject sender, EventArgs e)
{
int result = StartCamera();
Console.WriteLi ne(" startcamera = " + result);
}
}
}

When I click the button to do StartCamera I get the following
message
like it cannot find the DLL (which is in windows/system32). I have
tried moving the DLL to the C# apps directory too but that did not
help either. What am I doing wrong?

Thanks
Ringo

System.DllNotFo undException was unhandled
Message="Unable to load DLL 'facerecog.dll' : The specified module
could not be found. (Exception from HRESULT: 0x8007007E)"
Source="FaceRec ognition"
TypeName=""
StackTrace:
at FaceRecognition .Form1.StartCam era()
at FaceRecognition .Form1.button1_ Click(Object sender,
EventArgs
e) in E:\FaceRecognit ion\FaceRecogni tion\Form1.cs:l ine 78
at System.Windows. Forms.Control.O nClick(EventArg s e)
at System.Windows. Forms.Button.On Click(EventArgs e)
at System.Windows. Forms.Button.On MouseUp(MouseEv entArgs
mevent)
at System.Windows. Forms.Control.W mMouseUp(Messag e& m,
MouseButtons button, Int32 clicks)
at System.Windows. Forms.Control.W ndProc(Message& m)
at System.Windows. Forms.ButtonBas e.WndProc(Messa ge& m)
at System.Windows. Forms.Button.Wn dProc(Message& m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.OnMessage(M essage&
m)
at
System.Windows. Forms.Control.C ontrolNativeWin dow.WndProc(Mes sage&m)
at System.Windows. Forms.NativeWin dow.DebuggableC allback(IntPtr
hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
at
System.Windows. Forms.UnsafeNat iveMethods.Disp atchMessageW(MS G& msg)
at
System.Windows. Forms.Applicati on.ComponentMan ager.System.Win dows.Forms.Unsa ****feNativeMet hods.IMsoCompon entManager.FPus hMessageLoop(In t32
dwComponentID, Int32 reason, Int32 pvLoopData)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo pInner(Int32
reason, ApplicationCont ext context)
at
System.Windows. Forms.Applicati on.ThreadContex t.RunMessageLoo p(Int32
reason, ApplicationCont ext context)
at System.Windows. Forms.Applicati on.Run(Form mainForm)
at

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