asked on

Writing Main Program to test dll

I need a short Main program written in BC5 to test out my dll.
Dll complied using MFC, VC++6.
dll function -
extern "C" int Testing(void);
return value is the status of Testing function.
I have tried using _import and loadlibrary. But can't seems to work.

ASKER CERTIFIED SOLUTION

MDarling

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MDarling

if your going to use your dll from other languages such as VB you should declare it also as stdcall like this...

extern "C" __declspec(dllexport) __stdcall int Testing(void)

This will ensure that the parameter passing method can be used by VB and other stdcall mechanism languages.

regards,
Mike.

MDarling

a program to test this would look like...

void main()
{

HANDLE hLib=LoadLibrary("MyLib.DLL");
if(hLib)
{
FARPROC fProc=GetProcAddress(hLib,"Testing");
if(fProc)
{
// successfully got proc address
}
}

}

raymondwee

ASKER

Adjusted points from 30 to 50

raymondwee

ASKER

Thanks.
I have added those codes you mentioned.
but I can't get the address of the Function.(dll)
I have just changed my dll function to

extern int __declspec(dllimport) Test(char *name), where name is a input parameter for user to input name.

So my GetProcAddress should still be fProc = GetProcAddress(hLib,"Test");
right?

But the "if(fProc) ruturns NULL..

Pls help.

MDarling

"C" grade?????
why not just ask for more info and not grade yet?

MDarling

My answer was correct - by not putting extern "C" you have changed the name of the function.

You have introduced C++ name mangling - put the extern "C" back and all should be well.

Use the quickview application or depends.exe with VC++ to view the exports of a DLL.

C ???