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Visual Basic 5.0 and Visual C++ Interfacing

Posted on 1998-08-04
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How does one call a Visual C++ function from Visual Basic 5.0 program??
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Question by:pmaurin
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Expert Comment

by:Tbird
ID: 1467812
There are many was to get access to Visual C++ Code.

You can Write an OCX control in Visual C++.

You can Write a DLL that exposes functions, etc.

Which are you interested in?

If it is an OCX you merly need to add the OCX to your project and its properties methods and events are exposed.

If it is a DLL you must declare the function like any other DLL.
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shchuka earned 100 total points
ID: 1467813
You need to compile the C++ functions into a DLL

Declare your functions such as
void _declspec(DLLExport) _stdcall CFunction(paramlist)

You'll also need the DEF file, which will look like this:

LIBRARY
    dll-name
EXPORT
    CFunction

After you compiled it, you'll get a .dll file, say CFunction.dll

In you VB program, you'll declare it using

(use sub for void, fucntions for everything else)
declare sub CFunction lib "CFunction.dll" (paramlist)

After that you can call it as you would any function.
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