The "calling convention" they are asking for can be a build setting or specified in the source code. You don't seem to specify yours in the source code, so it is probably in the build settings. Common calling conventions are __stdcall and __cdecl. If you are using Visual Studio to build the C code it will be under Properties | C/C++ | Advanced | Calling Convention.
I have a project that is used successfully via P/Invoke and it is __cdecl. I believe the calling convention has to be __cdecl for the PInvoke to work, but I may be wrong about that. For the record, I have had problems getting the return value back. The eturn value of mine is a bool type, and it always returns false when called via P/Invoke (it will return the expected true/false when called from my unit test harness which is also written in unmanaged C++). I am successfully retrieving an out parameter which is a pointer to a char buffer array. That isn't of much use to you since I am marshalling the buffer using the StringBuilder object; I don't know what the procedure would be for marshalling an out parameter that is a struct. =================================== This list is hosted by DevelopMentor® http://www.develop.com View archives and manage your subscription(s) at http://discuss.develop.com
