Hello! SED, I have seen your topic¡± glut mouse declaration¡±, which posted on 05-06-2000 and I also get an error during compiling: cannot convert parameter 1 from ‘void (int,int,int,int)’ to ‘void (__cdecl *)(int,int,int,int)’ None of the functions with this name in scope match the target type, I want to know how you solve the problem. Please help me!! Thank you very much!!