>I have tried sending 0, "0", and CHR(0), but I always get an "Invalid Handle" error returned from the DLL function. I am not a C programmer, but the type of parameter I am trying to send to the function is defined as "typedef void *CDK_HANDLE" in the header file. I just need to be able to create a valid parameter to send to the function from VFP.

Rodney,

void and null are not synonymous. A void pointer is simply a pointer that can point to any data type (for example, it could point to a structure, an integer, a character array, or even a structure).

I can relate to pointers in C, but I can't help you much when it comes to pointers in VFP. On wiki, Ed Rauh has "Pointers on Pointers", which may help.

http://fox.wikis.com/wc.dll?Wiki~WednesdayNightLectures

Are you able to get an example of how someone has accessed the DLL from VB? That might shed some light.

Good luck,