Re: VB hooking VC++

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Article #86792

#86792

From: Alex Chacha
Date: Wed, 22 Jan 1997 00:00

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Bart Torbert wrote:
> 
> In article <01bbfdae$04ae76e0$2c467cce@internetamerica.airmail.net>,
> chizl@airmail.net says...
> >
> >We want to create a VB4 16bit front end and a VC++ 1.52 16bit back end
> >program.  We want to know what is the best or the only way to do this.
> >Thoughts here are VC++ Classes and Functions are compiles as a DLL and
> then
> >called from VB objects.  Is this correct or are we completly off base..

> While I have not tried it yet(but will have to shortly) you can make VB
> call a C/C++ DLL.  The VB Manuals say how to call functions from a DLL.
> 
> There however is a catch.  VB can not call a C++ Classes directly.
> OUCH!!!!
> 
> But it can call a regular C function from a DLL.  What you have to do is
> create two DLLs. One is whatever C++ classes you need.  The other is
> straight C that then calls the C++ classes. VB calls the straight C DLL
> which then calls the C++ DLL.  Some weird plumbing here, but it does work.

Best thing to do is write a DLL that you need (with C++ objects if
needed),
then create another DLL that wraps up the methods and exports only C
functions.
This would solve the problem.  The 2nd DLL would be the intermediary to
the first,
doing object manipulation and alloction from C function calls.


...ecaeP_Alex...

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From: Alex Chacha <achacha@panix.com>
Subject: Re: VB hooking VC++
Date: 1997/01/22
Message-ID: <32E68B26.4C98@panix.com>
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