A simple DLL project

[Enoch Chan]

I would like learn how to use VC++ 6.0 Stantard edition to
build a DLL. I used the VC++ option "A DLL that exports
some symbols" to generate a complete project for me. The
following is the source file, int fnTest(void) will be
exported.

// test.cpp : Defines the entry point for the DLL
application.
//

#include "stdafx.h"
#include "test.h"

BOOL APIENTRY DllMain( HANDLE hModule,
DWORD ul_reason_for_call,
LPVOID lpReserved
)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
case DLL_THREAD_ATTACH:
case DLL_THREAD_DETACH:
case DLL_PROCESS_DETACH:
break;
}
return TRUE;
}


// This is an example of an exported variable
__declspec( dllexport ) int nTest=0;

// This is an example of an exported function.
__declspec( dllexport ) int fnTest(void)
{
return 42;
}

// This is the constructor of a class that has been
exported.
// see test.h for the class definition
CTest::CTest()
{
return;
}

I have not change anything and build a dll.

However when I try to use VB6 to call this dll function by
using the following VB code

Declare Function fnTest Lib "test" () As Integer

Sub callaDLL()
Dim x As Integer
x = fnTest()
End Sub

The following error message pop up after callaDLL run.
runtime error '453'
Can't find DLL entry point fnTest in test

I know that thet function name is case sensitive and has
been checked.

Please help the beginner.

Thanks

Enoch

 

[David Faircastle]

Hi there,

It would seem that you've wandered into the wrong room. We all do VB here
and (mostly) quake in our boots when faced with C++. ;-)

There's a better room to go to somewhere down the hall, as it were. One of
the guys will tell you which it is in the morning.

DF

 

[Herfried K. Wagner [MVP]]

I would like learn how to use VC++ 6.0 Stantard edition to
build a DLL. I used the VC++ option "A DLL that exports
some symbols" to generate a complete project for me. The
following is the source file, int fnTest(void) will be
exported.

You will find a working sample here:

<http://www.ahs-bruck.asn-graz.ac.at/~hwagner/newsgroup/sort32.zip>