Trouble converting C# class into COM

[Eric]

hi,

I want to convert a C# class into COM, so that I can use the class in C++.
The codes compile and link well. But when I run the program, I got a
exception.
Any comment is welcome. Thanks in advance.

Eric
----------------------------------------------------------------------
in C#, compile into a COM :

using System;
using System.Net;
using System.Net.Sock ets;
using System.Text;
using System.Collecti ons;

namespace SonicBase
{
public delegate int dProc(byte[] buf, int offset, int size);
public class MyClass : IMyClass
{

private dProc myProc = null;

bool StartServer(dPr oc dlgt)
{
myProc = dlgt;

byte[] buf = new byte[100];
int ret = myProc(buf, 0, 100);

return (ret > 0);
}

bool SonicBase.IMyCl ass.StartServer (dProc dlgt)
{
return false;
}

}

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
}

--------------------------------------------------------------------------
in C++, use the COM :

// To use managed-code servers like the C# server,
// we have to import the common language runtime:
#import "mscorlib.t lb" raw_interfaces_ only

#import "EricBase.t lb" no_namespace named_guids

extern "C"
int ProcData(char* buf, int offset, int size)
{
return 0;
}

void CMainFrame::OnT est()
{
CoInitialize(NU LL);

IMyClass* icp = NULL;
HRESULT hr = CoCreateInstanc e(CLSID_MyClass ,
NULL, CLSCTX_INPROC_S ERVER,
IID_IMyClass, reinterpret_cas t<void**>(&icp) );
DWORD count=0;
AllocConsole();
HANDLE hOut = GetStdHandle(ST D_OUTPUT_HANDLE );
WriteConsole(hO ut, "a\n", 2, &count, NULL);

if(FAILED(hr))
{
AfxMessageBox(" fail create");
return;
}

try
{
_dProc* dlgt = (_dProc*)ProcDa ta;
icp->StartServer(dl gt);
}
catch(_com_erro r e)
{
CString strInfo = e.ErrorMessage( );
}

WriteConsole(hO ut, "b\n", 2, &count, NULL);

CoUninitialize( );
}

[Willy Denoyette [MVP]]

Hmm... this is tricky stuff.
You can't pass a C function ptr and use it directly as a delegate pointer,
you have to pass it as a long (C/C++) and marshal this value as a
FuctionPtr.
Here's what you should do.

1. change you C# code..

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
into:

public interface IMyClass
{
bool StartServer([MarshalAs(Unman agedType.Functi onPtr)]dProc dlgt);
}

2. Your C++ code:

icp->StartServer(dl gt);
into:
// reinterpret_cas t - You know what you are doing, don't you?
icp->StartServer(re interpret_cast< long>(dlgt));

Why do you implement an explicit interface for the method, there is no need
to do this just declare your interface methods as public. Or am I missing
something?

Willy.
"Eric" <wa**********@m sn.com> wrote in message
news:ub******** ******@TK2MSFTN GP15.phx.gbl...

hi,

I want to convert a C# class into COM, so that I can use the class in C++.
The codes compile and link well. But when I run the program, I got a
exception.
Any comment is welcome. Thanks in advance.

Eric
----------------------------------------------------------------------
in C#, compile into a COM :

using System;
using System.Net;
using System.Net.Sock ets;
using System.Text;
using System.Collecti ons;

namespace SonicBase
{
public delegate int dProc(byte[] buf, int offset, int size);
public class MyClass : IMyClass
{

private dProc myProc = null;

bool StartServer(dPr oc dlgt)
{
myProc = dlgt;

byte[] buf = new byte[100];
int ret = myProc(buf, 0, 100);

return (ret > 0);
}

bool SonicBase.IMyCl ass.StartServer (dProc dlgt)
{
return false;
}

}

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
}

--------------------------------------------------------------------------
in C++, use the COM :

// To use managed-code servers like the C# server,
// we have to import the common language runtime:
#import "mscorlib.t lb" raw_interfaces_ only

#import "EricBase.t lb" no_namespace named_guids

extern "C"
int ProcData(char* buf, int offset, int size)
{
return 0;
}

void CMainFrame::OnT est()
{
CoInitialize(NU LL);

IMyClass* icp = NULL;
HRESULT hr = CoCreateInstanc e(CLSID_MyClass ,
NULL, CLSCTX_INPROC_S ERVER,
IID_IMyClass, reinterpret_cas t<void**>(&icp) );
DWORD count=0;
AllocConsole();
HANDLE hOut = GetStdHandle(ST D_OUTPUT_HANDLE );
WriteConsole(hO ut, "a\n", 2, &count, NULL);

if(FAILED(hr))
{
AfxMessageBox(" fail create");
return;
}

try
{
_dProc* dlgt = (_dProc*)ProcDa ta;
icp->StartServer(dl gt);
}
catch(_com_erro r e)
{
CString strInfo = e.ErrorMessage( );
}

WriteConsole(hO ut, "b\n", 2, &count, NULL);

CoUninitialize( );
}

[Howard Swope]

Check out the information at:
http://msdn.microsoft.com/library/de...nentstocom.asp

Also checkout the interop news group:
microsoft.publi c.dotnet.framew ork.interop
"Eric" <wa**********@m sn.com> wrote in message
news:ub******** ******@TK2MSFTN GP15.phx.gbl...

hi,

I want to convert a C# class into COM, so that I can use the class in C++.
The codes compile and link well. But when I run the program, I got a
exception.
Any comment is welcome. Thanks in advance.

Eric
----------------------------------------------------------------------
in C#, compile into a COM :

using System;
using System.Net;
using System.Net.Sock ets;
using System.Text;
using System.Collecti ons;

namespace SonicBase
{
public delegate int dProc(byte[] buf, int offset, int size);
public class MyClass : IMyClass
{

private dProc myProc = null;

bool StartServer(dPr oc dlgt)
{
myProc = dlgt;

byte[] buf = new byte[100];
int ret = myProc(buf, 0, 100);

return (ret > 0);
}

bool SonicBase.IMyCl ass.StartServer (dProc dlgt)
{
return false;
}

}

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
}

--------------------------------------------------------------------------
in C++, use the COM :

// To use managed-code servers like the C# server,
// we have to import the common language runtime:
#import "mscorlib.t lb" raw_interfaces_ only

#import "EricBase.t lb" no_namespace named_guids

extern "C"
int ProcData(char* buf, int offset, int size)
{
return 0;
}

void CMainFrame::OnT est()
{
CoInitialize(NU LL);

IMyClass* icp = NULL;
HRESULT hr = CoCreateInstanc e(CLSID_MyClass ,
NULL, CLSCTX_INPROC_S ERVER,
IID_IMyClass, reinterpret_cas t<void**>(&icp) );
DWORD count=0;
AllocConsole();
HANDLE hOut = GetStdHandle(ST D_OUTPUT_HANDLE );
WriteConsole(hO ut, "a\n", 2, &count, NULL);

if(FAILED(hr))
{
AfxMessageBox(" fail create");
return;
}

try
{
_dProc* dlgt = (_dProc*)ProcDa ta;
icp->StartServer(dl gt);
}
catch(_com_erro r e)
{
CString strInfo = e.ErrorMessage( );
}

WriteConsole(hO ut, "b\n", 2, &count, NULL);

CoUninitialize( );
}

[Eric]

Hi, Willy,

After modifying the code, I got another exception saying that "invalid
agument", I guessed there would be some mismatch between delegate dProc and
functionPtr ProcData, but I don't know what's wrong.

I looked into the MSDN, it gaves only the samples using explicit
interface. Would you please give me a sample without an explicit interface?
Using interface to export a C# class into COM, is troublesome. It would be a
great pleasure not using the explicit interface here.

Thanks,
Eric
"Willy Denoyette [MVP]" <wi************ *@pandora.be> дÈëÓʼþ
news:ux******** ******@TK2MSFTN GP14.phx.gbl...

Hmm... this is tricky stuff.
You can't pass a C function ptr and use it directly as a delegate pointer,
you have to pass it as a long (C/C++) and marshal this value as a
FuctionPtr.
Here's what you should do.

1. change you C# code..

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
into:

public interface IMyClass
{
bool StartServer([MarshalAs(Unman agedType.Functi onPtr)]dProc dlgt);
}

2. Your C++ code:

icp->StartServer(dl gt);
into:
// reinterpret_cas t - You know what you are doing, don't you?
icp->StartServer(re interpret_cast< long>(dlgt));

Why do you implement an explicit interface for the method, there is no need to do this just declare your interface methods as public. Or am I missing
something?

Willy.
"Eric" <wa**********@m sn.com> wrote in message
news:ub******** ******@TK2MSFTN GP15.phx.gbl...

hi,

I want to convert a C# class into COM, so that I can use the class in C++. The codes compile and link well. But when I run the program, I got a
exception.
Any comment is welcome. Thanks in advance.

Eric
----------------------------------------------------------------------
in C#, compile into a COM :

using System;
using System.Net;
using System.Net.Sock ets;
using System.Text;
using System.Collecti ons;

namespace SonicBase
{
public delegate int dProc(byte[] buf, int offset, int size);
public class MyClass : IMyClass
{

private dProc myProc = null;

bool StartServer(dPr oc dlgt)
{
myProc = dlgt;

byte[] buf = new byte[100];
int ret = myProc(buf, 0, 100);

return (ret > 0);
}

bool SonicBase.IMyCl ass.StartServer (dProc dlgt)
{
return false;
}

}

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
}

--------------------------------------------------------------------------

in C++, use the COM :

// To use managed-code servers like the C# server,
// we have to import the common language runtime:
#import "mscorlib.t lb" raw_interfaces_ only

#import "EricBase.t lb" no_namespace named_guids

extern "C"
int ProcData(char* buf, int offset, int size)
{
return 0;
}

void CMainFrame::OnT est()
{
CoInitialize(NU LL);

IMyClass* icp = NULL;
HRESULT hr = CoCreateInstanc e(CLSID_MyClass ,
NULL, CLSCTX_INPROC_S ERVER,
IID_IMyClass, reinterpret_cas t<void**>(&icp) );
DWORD count=0;
AllocConsole();
HANDLE hOut = GetStdHandle(ST D_OUTPUT_HANDLE );
WriteConsole(hO ut, "a\n", 2, &count, NULL);

if(FAILED(hr))
{
AfxMessageBox(" fail create");
return;
}

try
{
_dProc* dlgt = (_dProc*)ProcDa ta;
icp->StartServer(dl gt);
}
catch(_com_erro r e)
{
CString strInfo = e.ErrorMessage( );
}

WriteConsole(hO ut, "b\n", 2, &count, NULL);

CoUninitialize( );
}

[Eric]

I read the articles from the link, but i can't get what i need.

thank you any way.
"Howard Swope" <howardsnewsATs pitzincDOTcom> дÈëÓʼþ
news:ug******** ******@TK2MSFTN GP11.phx.gbl...

Check out the information at:
http://msdn.microsoft.com/library/de...nentstocom.asp
Also checkout the interop news group:
microsoft.publi c.dotnet.framew ork.interop
"Eric" <wa**********@m sn.com> wrote in message
news:ub******** ******@TK2MSFTN GP15.phx.gbl...

hi,

I want to convert a C# class into COM, so that I can use the class in C++. The codes compile and link well. But when I run the program, I got a
exception.
Any comment is welcome. Thanks in advance.

Eric
----------------------------------------------------------------------
in C#, compile into a COM :

using System;
using System.Net;
using System.Net.Sock ets;
using System.Text;
using System.Collecti ons;

namespace SonicBase
{
public delegate int dProc(byte[] buf, int offset, int size);
public class MyClass : IMyClass
{

private dProc myProc = null;

bool StartServer(dPr oc dlgt)
{
myProc = dlgt;

byte[] buf = new byte[100];
int ret = myProc(buf, 0, 100);

return (ret > 0);
}

bool SonicBase.IMyCl ass.StartServer (dProc dlgt)
{
return false;
}

}

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
}

--------------------------------------------------------------------------

in C++, use the COM :

// To use managed-code servers like the C# server,
// we have to import the common language runtime:
#import "mscorlib.t lb" raw_interfaces_ only

#import "EricBase.t lb" no_namespace named_guids

extern "C"
int ProcData(char* buf, int offset, int size)
{
return 0;
}

void CMainFrame::OnT est()
{
CoInitialize(NU LL);

IMyClass* icp = NULL;
HRESULT hr = CoCreateInstanc e(CLSID_MyClass ,
NULL, CLSCTX_INPROC_S ERVER,
IID_IMyClass, reinterpret_cas t<void**>(&icp) );
DWORD count=0;
AllocConsole();
HANDLE hOut = GetStdHandle(ST D_OUTPUT_HANDLE );
WriteConsole(hO ut, "a\n", 2, &count, NULL);

if(FAILED(hr))
{
AfxMessageBox(" fail create");
return;
}

try
{
_dProc* dlgt = (_dProc*)ProcDa ta;
icp->StartServer(dl gt);
}
catch(_com_erro r e)
{
CString strInfo = e.ErrorMessage( );
}

WriteConsole(hO ut, "b\n", 2, &count, NULL);

CoUninitialize( );
}

[Eric]

I knows how to export C# class into COM without an explicit interface now.
like following:

namespace EricBase
{
[ClassInterface( ClassInterfaceT ype.AutoDual)] //strange syntax, but it's
the key
[Guid("64074EFB-17F6-4eb8-BC35-116A4FC950DB")]
public class Test
{
public void FuncA()
{
System.Console. WriteLine("in the COM");
}
}
}
the exception says "invalid agument" is still not solved.


"Eric" <wa**********@m sn.com> дÈëÓʼþ
news:eq******** ******@TK2MSFTN GP14.phx.gbl...

Hi, Willy,

After modifying the code, I got another exception saying that "invalid
agument", I guessed there would be some mismatch between delegate dProc and functionPtr ProcData, but I don't know what's wrong.

I looked into the MSDN, it gaves only the samples using explicit
interface. Would you please give me a sample without an explicit interface? Using interface to export a C# class into COM, is troublesome. It would be a great pleasure not using the explicit interface here.

Thanks,
Eric
"Willy Denoyette [MVP]" <wi************ *@pandora.be> дÈëÓʼþ
news:ux******** ******@TK2MSFTN GP14.phx.gbl...

Hmm... this is tricky stuff.
You can't pass a C function ptr and use it directly as a delegate pointer,

you have to pass it as a long (C/C++) and marshal this value as a
FuctionPtr.
Here's what you should do.

1. change you C# code..

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
into:

public interface IMyClass
{
bool StartServer([MarshalAs(Unman agedType.Functi onPtr)]dProc dlgt);
}

2. Your C++ code:

icp->StartServer(dl gt);
into:
// reinterpret_cas t - You know what you are doing, don't you?
icp->StartServer(re interpret_cast< long>(dlgt));

Why do you implement an explicit interface for the method, there is no

need

to do this just declare your interface methods as public. Or am I missing something?

Willy.
"Eric" <wa**********@m sn.com> wrote in message
news:ub******** ******@TK2MSFTN GP15.phx.gbl...

hi,

I want to convert a C# class into COM, so that I can use the class in

C++. The codes compile and link well. But when I run the program, I got a
exception.
Any comment is welcome. Thanks in advance.

Eric
----------------------------------------------------------------------
in C#, compile into a COM :

using System;
using System.Net;
using System.Net.Sock ets;
using System.Text;
using System.Collecti ons;

namespace SonicBase
{
public delegate int dProc(byte[] buf, int offset, int size);
public class MyClass : IMyClass
{

private dProc myProc = null;

bool StartServer(dPr oc dlgt)
{
myProc = dlgt;

byte[] buf = new byte[100];
int ret = myProc(buf, 0, 100);

return (ret > 0);
}

bool SonicBase.IMyCl ass.StartServer (dProc dlgt)
{
return false;
}

}

public interface IMyClass
{
bool StartServer(dPr oc dlgt);
}
}

--------------------------------------------------------------------------

in C++, use the COM :

// To use managed-code servers like the C# server,
// we have to import the common language runtime:
#import "mscorlib.t lb" raw_interfaces_ only

#import "EricBase.t lb" no_namespace named_guids

extern "C"
int ProcData(char* buf, int offset, int size)
{
return 0;
}

void CMainFrame::OnT est()
{
CoInitialize(NU LL);

IMyClass* icp = NULL;
HRESULT hr = CoCreateInstanc e(CLSID_MyClass ,
NULL, CLSCTX_INPROC_S ERVER,
IID_IMyClass, reinterpret_cas t<void**>(&icp) );
DWORD count=0;
AllocConsole();
HANDLE hOut = GetStdHandle(ST D_OUTPUT_HANDLE );
WriteConsole(hO ut, "a\n", 2, &count, NULL);

if(FAILED(hr))
{
AfxMessageBox(" fail create");
return;
}

try
{
_dProc* dlgt = (_dProc*)ProcDa ta;
icp->StartServer(dl gt);
}
catch(_com_erro r e)
{
CString strInfo = e.ErrorMessage( );
}

WriteConsole(hO ut, "b\n", 2, &count, NULL);

CoUninitialize( );
}

[Willy Denoyette [MVP]]

"Eric" <wa**********@m sn.com> wrote in message
news:ed******** *****@TK2MSFTNG P11.phx.gbl...

I knows how to export C# class into COM without an explicit interface now.
like following:

namespace EricBase
{
[ClassInterface( ClassInterfaceT ype.AutoDual)] //strange syntax, but
it's
the key
[Guid("64074EFB-17F6-4eb8-BC35-116A4FC950DB")]
public class Test
{
public void FuncA()
{
System.Console. WriteLine("in the COM");
}
}
}
the exception says "invalid agument" is still not solved.

No, your problem was that your interface method was not public. The reason
it 'works' now has nothing to do with the ClassInterface attribute.
Not that it's much better to indicate the types and UUID's of your COM
interfaces explicitely.

Not sure where/when the exception is thrown on you. Still I'm not clear on
what you are trying here, basically you are using COM interop in one sense
(cpp -> cs) and PInvoke interop in the other (cs -> cpp), I hope you have
some real reason to do this.
But, next is a sample based on your original posting, maybe this will give
you some clue.

1. CS COM - server:
// server.cs
using System;
using System.Runtime. InteropServices ;
namespace Whatever
{

public delegate int dProc(byte[] buf, int offset, int size);
// class interface (coclass)
[ClassInterface( ClassInterfaceT ype.None)]
[Guid("fa7e5cdd-766f-4541-9b9b-aee0cdde5c74")]
[ProgId("Test.My Class")]
public class MyClass :IMyClass
{
private dProc myProc = null;

public bool StartServer(dPr oc dlgt)
{
int ret = 0;
myProc = dlgt;
byte[] buf = new byte[] {65, 66, 67, 68, 69, 70, 00}; // drop some bytes
in the buffer
ret = myProc(buf, 0, buf.Length);
return (ret > 0);
}
}
// interface
[InterfaceType(C omInterfaceType .InterfaceIsDua l)]
[Guid("29853bbf-1838-49fe-8a70-eb262f24ee56")]
public interface IMyClass
{
bool StartServer([MarshalAs(Unman agedType.Functi onPtr)]dProc dlgt);
}
}

2. CPP file - client:
///////////////////////////////////
// C++ program
///////////////////////////////////
// cl /EHsc inprocclient.cp p

#define _WIN32_WINNT 0x0501
#include <objbase.h>
#include <iostream>
#import "server.tlb " no_namespace named_guids

// Callback function
extern "C"
int __stdcall ProcData(char* buf, int offset, int size)
{
std::cout << buf << "\toffset: " << offset << "\tsize: " << size <<
std::endl;
return 0;
}

int main ()
{
::CoInitialize( NULL);
// Create an instance of the COM object using smart ptr
IMyClassPtr pPtr(__uuidof(M yClass));
_dProc* dlgt = (_dProc*)ProcDa ta;
//pPtr->Dummy();
// Call method passing a function pointer as a long
// the interop layer must marshal this long to a valid function pointer
used as delegate pointer
// See CS file
pPtr->StartServer(re interpret_cast< long>(dlgt));
// uninitialize COM
::CoUninitializ e();
}

To build from the commandline, issue following commands (Ignore warning in
3):

regasm /unregister /tlb server.dll
csc /t:library server.cs
regasm /codebase /tlb server.dll
cl /EHsc inprocclient.cp p

run the client.

Willy.

[Eric]

Thank you for your warmhearted reply.
I tried your code, an exception was thrown out at
"pPtr->StartServer(re interpret_cast< long>(dlgt));" saying "invalid agument"
I stepped into the code, found that "raw_StartServe r(dlgt, &_result);"
returns "E_INVALIDA RG" and cause _com_issue_erro rex() to throw out an
exception. Why raw_StartServer () returns "E_INVALIDA RG" here ?

"Willy Denoyette [MVP]" <wi************ *@pandora.be> дÈëÓʼþ
news:OP******** *****@TK2MSFTNG P11.phx.gbl...

"Eric" <wa**********@m sn.com> wrote in message
news:ed******** *****@TK2MSFTNG P11.phx.gbl...

I knows how to export C# class into COM without an explicit interface now. like following:

namespace EricBase
{
[ClassInterface( ClassInterfaceT ype.AutoDual)] //strange syntax, but
it's
the key
[Guid("64074EFB-17F6-4eb8-BC35-116A4FC950DB")]
public class Test
{
public void FuncA()
{
System.Console. WriteLine("in the COM");
}
}
}
the exception says "invalid agument" is still not solved.

No, your problem was that your interface method was not public. The reason
it 'works' now has nothing to do with the ClassInterface attribute.
Not that it's much better to indicate the types and UUID's of your COM
interfaces explicitely.

Not sure where/when the exception is thrown on you. Still I'm not clear on
what you are trying here, basically you are using COM interop in one sense
(cpp -> cs) and PInvoke interop in the other (cs -> cpp), I hope you have
some real reason to do this.
But, next is a sample based on your original posting, maybe this will give
you some clue.

1. CS COM - server:
// server.cs
using System;
using System.Runtime. InteropServices ;
namespace Whatever
{

public delegate int dProc(byte[] buf, int offset, int size);
// class interface (coclass)
[ClassInterface( ClassInterfaceT ype.None)]
[Guid("fa7e5cdd-766f-4541-9b9b-aee0cdde5c74")]
[ProgId("Test.My Class")]
public class MyClass :IMyClass
{
private dProc myProc = null;

public bool StartServer(dPr oc dlgt)
{
int ret = 0;
myProc = dlgt;
byte[] buf = new byte[] {65, 66, 67, 68, 69, 70, 00}; // drop some

bytes in the buffer
ret = myProc(buf, 0, buf.Length);
return (ret > 0);
}
}
// interface
[InterfaceType(C omInterfaceType .InterfaceIsDua l)]
[Guid("29853bbf-1838-49fe-8a70-eb262f24ee56")]
public interface IMyClass
{
bool StartServer([MarshalAs(Unman agedType.Functi onPtr)]dProc dlgt);
}
}

2. CPP file - client:
///////////////////////////////////
// C++ program
///////////////////////////////////
// cl /EHsc inprocclient.cp p

#define _WIN32_WINNT 0x0501
#include <objbase.h>
#include <iostream>
#import "server.tlb " no_namespace named_guids

// Callback function
extern "C"
int __stdcall ProcData(char* buf, int offset, int size)
{
std::cout << buf << "\toffset: " << offset << "\tsize: " << size <<
std::endl;
return 0;
}

int main ()
{
::CoInitialize( NULL);
// Create an instance of the COM object using smart ptr
IMyClassPtr pPtr(__uuidof(M yClass));
_dProc* dlgt = (_dProc*)ProcDa ta;
//pPtr->Dummy();
// Call method passing a function pointer as a long
// the interop layer must marshal this long to a valid function pointer
used as delegate pointer
// See CS file
pPtr->StartServer(re interpret_cast< long>(dlgt));
// uninitialize COM
::CoUninitializ e();
}

To build from the commandline, issue following commands (Ignore warning in
3):

regasm /unregister /tlb server.dll
csc /t:library server.cs
regasm /codebase /tlb server.dll
cl /EHsc inprocclient.cp p

run the client.

Willy.

[Willy Denoyette [MVP]]

"Eric" <wa**********@m sn.com> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Thank you for your warmhearted reply.
I tried your code, an exception was thrown out at
"pPtr->StartServer(re interpret_cast< long>(dlgt));" saying "invalid
agument"
I stepped into the code, found that "raw_StartServe r(dlgt, &_result);"
returns "E_INVALIDA RG" and cause _com_issue_erro rex() to throw out an
exception. Why raw_StartServer () returns "E_INVALIDA RG" here ?

The same code dumps :

ABCDEF offset: 0 size: 7

to the console when run on Framework v1.1.4322 (v1.1 SP1).
I'm using the latest C++ compiler ( Version 14.00.40904) to compile the cpp,
not sure what you are using. Did you inspect the tli and tlh files?
Are you sure you registered the tlb (regasm /tlb ...)?

Willy.

[Eric]

hi Willy,

I do the work with VirsualStudio20 03, same version as you.

Look into the following link:
http://www.dotnetinterop.com/feature...aspx?q=Whidbey

It says: in dotNET v2.0 "The runtime now supports marshaling of function
pointers to delegates. The reverse - delegate to function pointer - has been
possible since version one. "

Isn't it means we can't marshal function pointers to delegates currently now
?

Am I misunderstand something ?

Regards,
Eric

"Willy Denoyette [MVP]" <wi************ *@pandora.be> дÈëÓʼþ
news:ux******** ******@TK2MSFTN GP14.phx.gbl...

"Eric" <wa**********@m sn.com> wrote in message
news:%2******** ********@tk2msf tngp13.phx.gbl. ..

Thank you for your warmhearted reply.
I tried your code, an exception was thrown out at
"pPtr->StartServer(re interpret_cast< long>(dlgt));" saying "invalid
agument"
I stepped into the code, found that "raw_StartServe r(dlgt, &_result);"
returns "E_INVALIDA RG" and cause _com_issue_erro rex() to throw out an
exception. Why raw_StartServer () returns "E_INVALIDA RG" here ?

The same code dumps :

ABCDEF offset: 0 size: 7

to the console when run on Framework v1.1.4322 (v1.1 SP1).
I'm using the latest C++ compiler ( Version 14.00.40904) to compile the

cpp, not sure what you are using. Did you inspect the tli and tlh files?
Are you sure you registered the tlb (regasm /tlb ...)?

Willy.