problems using dllimport

[Paul Duncan]

diggityduncs (Programmer) Nov 13, 2003
Hello,

I'm tring to use a win32/api dll in c#

The vendor I received the dll from doesn't know anything
about .net

I received two files
ACGAPI.DLL +
ACGAPI.LIB

and some example source code

Declaration:

Visual C/C++

extern "C" __declspec(dlli mport) int __stdcall
V5_CalculateAct ivationCode(LPS TR lpSiteCode, LPSTR
lpProgramID, DWORD CustomFeatures, LPSTR
lpActivationCod e, LPSTR lpRemovalCode)

Visual basic:

Declare Function V5_CalculateIni tCode Lib "ACGAPI.DLL "
Alias "_V5_CalculateI nitCode@20" (ByVal SiteCode As
String, ByVal ProgramID As String, ByVal CustomFeatures
As Long, ByVal ActivationCode As String, ByVal
RemovalCode As String) As Long

Parameters:

(in)

LPSTR lpSiteCode - Pointer to Site code string (8
characters long)

LPSTR lpProgramID - Pointer to ProgramID (24 characters
long)

DWORD CustomFeatures - Status of custom features (set to
0 if custom features are not required)

(out)
LPSTR lpActivationCod e - Pointer to buffer for activation
code (should be at least 36 character long)

LPSTR lpRemovalCode - Pointer to buffer for removal code
(should be at least 9 character long)

This is code I came up with

using System.Runtime. InteropServices ;

[DllImport("acga pi.dll")]
private static extern long V5_CalculateAct ivationCode
(string SiteCode,string ProgramID,long
CustomFeatures, string ActivationCode, string RemovalCode);

I get the following error when I run the code

Unable to find an entry point named
V5_CalculateAct ivationCode in DLL acgapi.dll
I believe it may something to do with the .lib file. In
the old visual studio you could add the .lib file in the
project settings

http://www.codeproject.com/audio/speech.asp?print=true

but I'm not sure where you do this VS.net
Any help here would greatly be appreciated,
Thanks,
Paul

[Michael Culley]

You don't need the lib file, you need an entry point:

[DllImport("acga pi.dll", EntryPoint="_V5 _CalculateInitC ode@20")]
private static extern int V5_CalculateAct ivationCode
(string SiteCode,string ProgramID,int
CustomFeatures, string ActivationCode, string RemovalCode);
Note that longs in vb6 are ints in c#.

--
Michael Culley
"Paul Duncan" <di**********@h otmail.com> wrote in message news:05******** *************** *****@phx.gbl.. . diggityduncs (Programmer) Nov 13, 2003
Hello,

I'm tring to use a win32/api dll in c#

The vendor I received the dll from doesn't know anything
about .net

I received two files
ACGAPI.DLL +
ACGAPI.LIB

and some example source code

Declaration:

Visual C/C++

extern "C" __declspec(dlli mport) int __stdcall
V5_CalculateAct ivationCode(LPS TR lpSiteCode, LPSTR
lpProgramID, DWORD CustomFeatures, LPSTR
lpActivationCod e, LPSTR lpRemovalCode)

Visual basic:

Declare Function V5_CalculateIni tCode Lib "ACGAPI.DLL "
Alias "_V5_CalculateI nitCode@20" (ByVal SiteCode As
String, ByVal ProgramID As String, ByVal CustomFeatures
As Long, ByVal ActivationCode As String, ByVal
RemovalCode As String) As Long

Parameters:

(in)

LPSTR lpSiteCode - Pointer to Site code string (8
characters long)

LPSTR lpProgramID - Pointer to ProgramID (24 characters
long)

DWORD CustomFeatures - Status of custom features (set to
0 if custom features are not required)

(out)
LPSTR lpActivationCod e - Pointer to buffer for activation
code (should be at least 36 character long)

LPSTR lpRemovalCode - Pointer to buffer for removal code
(should be at least 9 character long)

This is code I came up with

using System.Runtime. InteropServices ;

[DllImport("acga pi.dll")]
private static extern long V5_CalculateAct ivationCode
(string SiteCode,string ProgramID,long
CustomFeatures, string ActivationCode, string RemovalCode);

I get the following error when I run the code

Unable to find an entry point named
V5_CalculateAct ivationCode in DLL acgapi.dll
I believe it may something to do with the .lib file. In
the old visual studio you could add the .lib file in the
project settings

http://www.codeproject.com/audio/speech.asp?print=true

but I'm not sure where you do this VS.net
Any help here would greatly be appreciated,
Thanks,
Paul

[Jeffrey Tan[MSFT]]

Hi Paul,

The lib files are for the Visual C++ to static link the dll files.
While the interop the dll use the dynamic call, it does not need the lib
files.
For more information about lib files, you can check:
http://msdn.microsoft.com/library/de...us/vccore/html
/_core_lib_refer ence.asp

I think you should check the return type of your function. Also, you can
use EntryPoint field to specify a function entry.

Hope this helps,
Best regards,
Jeffrey Tan
Microsoft Online Partner Support
Get Secure! - www.microsoft.com/security
This posting is provided "as is" with no warranties and confers no rights.

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| diggityduncs (Programmer) Nov 13, 2003
| Hello,
|
| I'm tring to use a win32/api dll in c#
|
| The vendor I received the dll from doesn't know anything
| about .net
|
| I received two files
| ACGAPI.DLL +
| ACGAPI.LIB
|
| and some example source code
|
| Declaration:
|
| Visual C/C++
|
| extern "C" __declspec(dlli mport) int __stdcall
| V5_CalculateAct ivationCode(LPS TR lpSiteCode, LPSTR
| lpProgramID, DWORD CustomFeatures, LPSTR
| lpActivationCod e, LPSTR lpRemovalCode)
|
| Visual basic:
|
| Declare Function V5_CalculateIni tCode Lib "ACGAPI.DLL "
| Alias "_V5_CalculateI nitCode@20" (ByVal SiteCode As
| String, ByVal ProgramID As String, ByVal CustomFeatures
| As Long, ByVal ActivationCode As String, ByVal
| RemovalCode As String) As Long
|
| Parameters:
|
| (in)
|
| LPSTR lpSiteCode - Pointer to Site code string (8
| characters long)
|
| LPSTR lpProgramID - Pointer to ProgramID (24 characters
| long)
|
| DWORD CustomFeatures - Status of custom features (set to
| 0 if custom features are not required)
|
| (out)
| LPSTR lpActivationCod e - Pointer to buffer for activation
| code (should be at least 36 character long)
|
| LPSTR lpRemovalCode - Pointer to buffer for removal code
| (should be at least 9 character long)
|
|
|
| This is code I came up with
|
| using System.Runtime. InteropServices ;
|
| [DllImport("acga pi.dll")]
| private static extern long V5_CalculateAct ivationCode
| (string SiteCode,string ProgramID,long
| CustomFeatures, string ActivationCode, string RemovalCode);
|
| I get the following error when I run the code
|
| Unable to find an entry point named
| V5_CalculateAct ivationCode in DLL acgapi.dll
|
|
| I believe it may something to do with the .lib file. In
| the old visual studio you could add the .lib file in the
| project settings
|
| http://www.codeproject.com/audio/speech.asp?print=true
|
| but I'm not sure where you do this VS.net
|
|
| Any help here would greatly be appreciated,
| Thanks,
| Paul
|