"__declspec(dllexport)" is ok, you don't need to modify the .def file. Or, you can modify the .def file and then, the "__declspec(dllexport)" is useless. The problem is the extern "C", as Albert already said.

Another "trick": if your dll is not really C++, rename the .cpp files to .c and you don't need the extern "C".

Vlad

>Just one more thing... Using the usual "__declspec(dllexport)" didn't make the function visible. I had to put it in the .DEF file.