Hi erveryone,

I'm a new member of this great forum and hope to find nice people
Hmm... I can say more about me first, if you would like.
My name is Jérôme, is 20 years old, born and live in Strasbourg (North-East France) and got used to create C/C++ statements for plugin for Messenger Plus! older versions.


I would like to extend the limited functions provided by JScript in adding an external library (.dll) to provide new powerful features.
But when calling Interop.Call(), the debugging window tell me that an unknown error has occured.

Here is a part of the C/C++ code in the DLL file :

test.h header file

code:

---

#ifndef _TEST_H_
#define _TEST_H_

#ifndef _UNICODE
#define _UNICODE
#endif

#define DLLEXPORT __declspec(dllexport)

extern "C++" {

// API test
int __stdcall DLLEXPORT CreateTest(TCHAR* szMessage);


} // end extern C++

#endif

---

code:

---

#include <windows.h>
#include "test.h"


extern "C++" {


// API test
int __stdcall DLLEXPORT CreateTest(TCHAR* szMessage) {


    MessageBox(NULL, "", "", 0);
    MessageBox(NULL, szMessage, TEXT(""), MB_ICONHAND | MB_OK);
    return 1;
}


} // end extern C++

---

code:

---

Interop.Call("xmsn32.dll", "CreateTest", Message);
Debug.Trace("Test created - " + Message);
FreeDll("xmsn32.dll");

---

Hmmm have found the solution : the function is exported by Dev-C++ with an other name that specified... then Interop.Call() can't find the function within the DLL.

that's because of the "extern C++" directive. Replace that by "extern C" when declaring the function and its name should not be decorated.

Hi Patchou,

I already know that yesterday
Problem solved.

Thanks for your answer


Cheers,
S4KurA_^