Parameter Passage Between VB (4.0/5.0) and DLL

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2 total messages Started by farrellrp3 Tue, 06 Jan 1998 00:00

#10

Author: farrellrp3
Date: Tue, 06 Jan 1998 00:00

13 lines
1495 bytes

I am having problems interfacing through VB 4.0 16 bit with a 16 bit
DLL which I made with WATCOM C++.  I can call a number of functions in
the DLL, but I get a Windows system crash when I call a particular
function in this DLL.

	It seems that DLL functions which take as parameters either scaler
values or pointers to strings work fine. The problem arises when a DLL
function expects a pointer to an array (i.e. a pointer to a pointer).
How do you make VB's parameter passage conform to this situation of two
levels of indirection?

	Thanks in Advance for you help.

Re: Parameter Passage Between VB (4.0/5.0) and DLL

#11

Author: John Winters
Date: Tue, 06 Jan 1998 00:00

27 lines
2127 bytes

In article <34B28F40.178D@ibm.net>, farrellrp3  <farrellrp3@ibm.net> wrote:
>I am having problems interfacing through VB 4.0 16 bit with a 16 bit
>DLL which I made with WATCOM C++.  I can call a number of functions in
>the DLL, but I get a Windows system crash when I call a particular
>function in this DLL.
>
>	It seems that DLL functions which take as parameters either scaler
>values or pointers to strings work fine. The problem arises when a DLL
>function expects a pointer to an array (i.e. a pointer to a pointer).
>How do you make VB's parameter passage conform to this situation of two
>levels of indirection?

Obviously the place to ask about interfacing a program written in
Visual Basic to a 16-bit DLL written in C++, using facilities specific
to one peculiar platform is comp.lang.c.

Please take a bit more care when selecting where to post to.

Follow-ups set.

John
-- 
John Winters.  Wallingford, Oxon, England.

Want to buy Linux CDs cheaply in the UK?  Join the Linux Buyers' Consortium.
See <http://www.polo.demon.co.uk/lbc.html>

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