【VC报错】fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h
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compile error:
c:\program files\microsoft visual studio\vc98\mfc\include\afxv_w32.h(14) :
fatal error C1189: #error : WINDOWS.H already included. MFC apps must not #include <windows.h>
如果编译器在编译afxv_w32.h文件之前编译了windows.h文件,编译器会报上面的错误,因为在afxv_w32.h文件中有下面的一句预编译报警:
#ifdef _WINDOWS_
#error WINDOWS.H already included. MFC apps must not #include <windows.h>
#endif
问题在于为什么afxv_w32.h中要有这么一句预编译处理。看了afxv_w32.h和windows.h文件就有点明白了。
在afxv_w32.h中有下面的预编译语句:
... ...
#undef NOLOGERROR
#undef NOPROFILER
#undef NOMEMMGR
#undef NOLFILEIO
#undef NOOPENFILE
#undef NORESOURCE
#undef NOATOM
... ...
在afxv_w32.h中还有一句:
#include "windows.h"
而在windows.h文件中有下面的预编译语句:
... ...
#define NOATOM
#define NOGDI
#define NOGDICAPMASKS
#define NOMETAFILE
#define NOMINMAX
#define NOMSG
#define NOOPENFILE
... ...
注意到在windows.h的开头有防止windows.h被重复编译的预编译开关:
#ifndef _WINDOWS_
#define _WINDOWS_
这样问题就明白了,虽然我不知道微软为什么要这么做,但是我知道如果在afxv_w32.h没有那句预编译报警,那么如果在编译afxv_w32.h之前
编译了windows.h,那么在windows.h中#define的NOATOM等宏就会被#undef掉,可能会导致相应的错误发生。
猜想原因可能如上所述,我的解决方法是,将包含有#include “windows.h"的头文件放在所有包含的头文件的最后面,这样使得对afxv_w32文件
的编译处理发生在先,这样,由于在afxv_w32.h中已经包含了windows.h,那么宏_WINDOWS_将被定义,后继的#include "windows.h"语句将形同虚设,
上面的编译报警也不会发生了。我觉得这种处理要比将所有的#include "windows.h”语句删掉要好一点。
一句话,编译器必须在编译windows.h之前编译afxv_w32.h,因为我不是十分清除什么时候afxv_w32.h会被编译,所以我将可能包含有#include "windows.h"的头文件放在其他头文件之后#include。
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