Re: Problems calling a function in a DLL

From:
"Scott McPhillips [MVP]" <org-dot-mvps-at-scottmcp>
Newsgroups:
microsoft.public.vc.language
Date:
Mon, 30 Apr 2007 14:18:37 -0400
Message-ID:
<ODUj2P1iHHA.4676@TK2MSFTNGP02.phx.gbl>
shanzer wrote:

I have writtin some code to call a function inside a DLL.
I use LoadLibrary to load the DLL, I call GetProcAddress to get the address
of the function, and then I call the function. The function returns with out
a problem, and it does all the work (one of the arguments is a buffer which
the function fills in, another is a pointer to an int which contains the
amount of data filled in).

How ever right after I step out of the function I get a "user breakpoint
called from code ...". What did I miss?

Below is the code:
#include <windows.h>
#include <stdio.h>

main()
{
  HINSTANCE sdll = LoadLibrary("testme.dll");
  if (sdll == 0) {
    fprintf(stderr, "Failed to load password seed module\n");
    exit(-1);
  }
  typedef DWORD (WINAPI *tfn) (unsigned char *, unsigned int, unsigned int *);


Specify WINAPI in the DLL function declaration too, so the function
calling convention will match what your typedef assumes.

--
Scott McPhillips [VC++ MVP]

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