Where is WIN32 defined, and how can I include this definition in my project?

Question

I am including a third party header and source file into my project.

At the top of the header there is this:

#if defined(WIN32) || defined(WIN16)
#i         


        

Answer 1

Some WIN32 defined in the compiler . Just like this，If you use the gcc for windows , WIN32 is defined . If you use the gcc for linux , WIN32 is not defined :)
So , the macros is a switch. You can define it to use somethine , and not define it to unuse something.