Sharing the same VB DLL\EXE between a C++ DLL and a VB Active EXE

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John Guilbert - 21 Nov 2003 12:48 GMT

Hi,

I am having a problem in that I need to create a
shared VB DLL\Active EXE for both a C++ DLL and a VB EXE/DLL to share
the same variable values. I would be
very grateful if someone could just provide an example in format as
follows:-

Shared VB DLL (Class):
**********************

Public intSharedVariable as Integer

c++ dll
**********************

bla bla bla (update and display variable)

VB EXE/DLL
*************

bla bla bla (update and display variable)

I have tried using import and set my shard VBDLL to 'GlobalMultiUse',
but they each still use different instances/memory. Maybe my set-up is
wrong?

Anyones help would be much appreciated. Been a while out of C++ now...

Thanks,

John Guilbert.

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John Guilbert - 26 Nov 2003 12:58 GMT

This is now solved.

Problem:

Needed to share Visual Basic DLL variable values with C++ (i.e. Global
Variables).

Resolution:

NEW Intermediate C++ DLL
Created an intermediate C++ DLL with the SetSharedMem and GetSharedMem
functions (browse the web for the C/C++ DLL code). Must export
functions setsharedmem and getsharedmem as _stdcall functions.

C++ DLL
In main C++ dll I loaded the intermediate C++ DLL (ensuring to use the
_stdcall in the procedure definitions for GetProcAddress - this is
what caused the problem). Example: typedef VOID (_stdcall
*SETSHAREDMEM)(LPTSTR);

VB DLL
Use Declare statement (all parameters as BYVALS) to get the two
functions; getsharedmem and setsharedmem.

EASY.......

Hope this helps anyone.

John.

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VB Forum / COM / November 2003

Sharing the same VB DLL\EXE between a C++ DLL and a VB Active EXE