Question

I have a vc++ dll which has a funciton call like this :

 typedef void * SIS_HANDLE;
 EXTERN_C SDK4OpenDevice (SIS_HANDLE* sDev );

Now am trying to call the VC++ dll in VB6 is there any equivalent for the same in VB6.

Thanks

Answer 1

Yes, it’s a pointer-sized integer, which is Long in VB6. And your function takes a pointer to a pointer, so it will be ByRef.

Declare Sub SDK4OpenDevice(ByRef sDev As Long);

Watch out for the calling convention though, if that EXTERN_C macro doesn’t hide a __stdcall or __pascal keyword, the function can’t be called from VB6 directly.