Hi, I''m trying to build my own screen saver. I supplied the ScreenSaverProc, ScreenSaverConfigureDialog and the RegisterWindowClasses, link the scrnsaver.lib and included the include file. I also export the two windowprocs. It compiles fine, but when I try to build it, I get the following linker error: scrnsave.lib(scrnsave.obj) : error LNK2001: Nichtaufgeloestes externes Symbol _RegisterDialogClasses@4 (it means "unresolved extern symbol") Here is my RegisterDialogClasses function: BOOL WINAPI RegisterDialogClasses(HINSTANCE hInst) { return 1; } Any ideas what I''m doing wrong?

Hehe, now I''m answering my own question....

The problem was, that this lib is an old C lib, and so it expected an C-style function to be exported. So I put my function into extern "C" { }, but that just led to an error that I can''t overload a C function. Great, how do I define it? I looked at the scrnsave.h and found out that in an extern block the function header was declared.

The only solution I found to place this function in a .c file instead of having it in my .cpp file.

Maybe I''m just too inexperienced, but it seems this API is kinda picky about being used...