determine VS compiler version in C++

[campster]

I hope that someone can help me with this C++ problem.

I work in an environment where our clients use various versions of VS so our code has to vary based on the VS version being used. I'm editing some code that has something like this:

#ifdef Win32
#if ( _MSC_VER < 1300 )
#define STDCALL __stdcall
#else
#define STDCALL
#endif
#endif

My question is how do i detemine the MSC version? What does the 1300 represent? As a tutorial, I would like to use a form/message box that will display the version number. Any help would be appreciated greatly.