I've got a Windows DLL that I wrote, written in C/C++ (all exported functions are 'C'). The DLL works fine for me in VC++. I've given the DLL to another company who do all their development in VB. They seem to be having a problem linking to the functions. I haven't used VB in ten years and I don't even have it installed. What could be the problem?

I've declared all my public functions as follows:

define MYDCC_API __declspec(dllexport)

MYDCCL_API unsigned long MYDCC_GetVer( void); . . .

Any ideas?

Finally got back to this today and have it working. The answers put me on the right track but I found this most helpful:

http://www.codeproject.com/KB/DLL/XDllPt2.aspx

Also, I had a few problems passing strings to the DLL functions, I found this helpful:

http://www.flipcode.com/archives/Interfacing_Visual_Basic_And_C.shtml