Thread: Access VB DLL from C++ ?

Hi!

I'm have written a Visual Basic DLL, and I want to access it from my C++ code.

I've read this:
http://www.flipcode.com/articles/article_vbdlls.shtml

and this:
http://www.flipcode.com/tutorials/tut_dll01.shtml

I am able to load the DLL, but I am not able to load any functions.

Think you can help? -Look below if you need to see my code.

Torbjørn

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

Here is my Visual Basic code:

Code:

' Initializes the Class
Private Sub Class_Initialize()
    MsgBox "This procedure is called when the DLL is loaded into memory.", vbOKOnly, "Initializing Class..."
End Sub
Sub Class_TestFunc()
    MsgBox "We are testing to use DLLs created in Visual Basic to work with C++", vbOKOnly, "Test function..."
End Sub
' Terminates the Class
Private Sub Class_Terminate()
    MsgBox "This procedure is called when the DLL is removed from memory.", vbOKOnly, "Cleaning up..."
End Sub

And this is my C++ code:

header-file:

Code:

#ifndef OPCCPLUSPLUSTEST_H
#define OPCCPLUSPLUSTEST_H

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "stdafx.h"

typedef void (WINAPI*vbfunc)();

#endif //OPCCPLUSPLUSTEST_H

source-file:

Code:

// OPCCplusplusTest.cpp : Defines the entry point for the console application.
//

#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <iostream.h>
#include "stdafx.h"
#include "OPCCplusplusTest.h"

vbfunc TestFunc;

int main(int argc, char* argv[])
{
	
	HINSTANCE hLib = LoadLibrary("OPCclient.dll");
	if(hLib == NULL)
	{
		printf("ERROR: Unable to load library!\n");
		getchar();
		return 0;
	}
	
	TestFunc = (vbfunc)GetProcAddress((HMODULE)hLib,"Class_TestFunc");

	if(TestFunc==NULL) {
            printf("Unable to load function(s).\n");
            FreeLibrary((HMODULE)hLib);
            return 0;
    }


	TestFunc();

	printf("Hello World!\n");

	FreeLibrary((HMODULE)hLib);

	return 0;
}

Hmm...I'm not really sure... I just followed the tutorial at http://www.flipcode.com/articles/article_vbdlls.shtml

But when I compile the VB dll, there is a .exp-file generated.


Torbjørn

By the way: I have changed the "vbfunc" to "cfunc".

-Kind of found out that the "c" in "cfunc" represents a char, and not the programming language c... Am I right?

But also after doing that, it won't work..