Windows.h错误

Question

I am getting error :

WINDOWS.H already included.  MFC apps must not #include <windows.h>

Help needed.

Answer 1

Remove the second inclusion, from (presumably) your code. Here is a MSDN forum thread about the problem, it seems it can also depend on your exact inclusion order.

Answer 2

Using the /showIncludes preprocessor directive, the output window will display all the includes before the error. There you can find which file erroneously includes windows.h .

Then find out why this file is needed.

Answer 3

If you use MFC, do not use #include <windows.h> manually anywhere in your code. MFC includes it in its own way and you already have access do all declarations of this header.

Answer 4

Oh well, the error message seems say just everything.

When you've created an MFC app, it already included windows.h.

Answer 5

Sometimes, the best way to fix errors is to do as the error message says .

Just a thought.

Answer 6

使用mfc时，请使用#include <afx.h>而不是#include <windows> 。