WIN32和_WIN32的区别

WIN32 is a name that you could use and even define in your own code and so might clash with Microsoft's usage. _WIN32 is a name that is reserved for the implementor (tn this case MS) because it begins with an underscore and an uppercase letter - you are not allowed to define reserved names in your own code, so there can be no clash.

• WIN32 is defined by the SDK or the build environment, so it does not use the implementation reserved namespace
• _WIN32 is defined by the compiler so it uses the underscore to place it in the implementation-reserved namespace

You'll find a similar set of dual defines with nearly identical names and similar uses such as _UNICODE/UNICODE, _DEBUG/DEBUG, or maybe _DLL/DLL (I think that only the UNICODE ones get much of any use in their different versions). Though sometimes in these cases (like _UNICODE), instead of the underscore version being defined by the compiler, they are used to control what the CRT headers do:

• _UNICODE tells the CRT headers that CRT names which can be either Unicode or ANSI (such as _tcslen() should map to the wide character variant (wcslen())
• UNICODE does something similar for the SDK (maps Win32 APIs to their "W" variants)

参见：http://stackoverflow.com/questions/662084/whats-the-difference-between-the-win32-and-win32-defines-in-c

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