🚀 go-pugleaf

In <1992Dec15.135809.5339@u.washington.edu> tvp@gibdo.engr.washington.edu writes:


>I rewrote the inside of my C source to compile it into a .dll file.
>Then I followed the instructions in the VB manuals to declare and call
>the function inside the DLL that was replacing the standalone C app I
>used to use under DOS. But when I hit F5 to test the VB app, and get
>to the part where I push the command button that will cause the DLL
>function to be called, it fails and tells me:

>          "Function or sub undefined"

>Does anyone know what's up and how I can fix it? I'M STUCK!

I had similar problems last summer. Here are possible solutions:

o make sure all the functions are defined with PASCAL -keyword
  and are exported with _export -keyword.
  (eg. int PASCAL _export function_to_be_called () )

o in case you are trying to call functions which are compiled in
  c++ -mode, you should include a header file which defines
  these functions with extern "C" -clause. (Borland C++ mungles the
  function names otherwise and therefore cannot be called from VB)
  (eg. extern "C" { int PASCAL function_to_be_called () })

Hope this helps.

--
Janne 'Kaneli' Saarela I Rytmih{iri|it{ jo I Dept. of Computer Science
Janne.Saarela@hut.fi   I vuodesta 1992     I Helsinki University of Tech.