'_WIN32_WINNT'/'WINVER':宏重新定义

时间:2016-12-29 09:17:22

标签: c++ windows visual-studio-2015 windows-xp

我有一个VS2015 C++项目。应用程序必须在Windows 7和XP上运行。所以,我想设置_WIN32_WINNT& WINVER_WIN32_WINNT_WINXP

这就是我项目stdafx.h的样子:

stdafx.h中

#pragma once

#include "targetver.h"

#define _WIN32_WINNT        _WIN32_WINNT_WINXP         
#define WINVER              _WIN32_WINNT_WINXP   

#include <WinSDKVer.h>

// Windows Header Files:
#include <windows.h>

编译时,我看到以下警告/错误:

stdafx.h(12): error C2220: warning treated as error - no 'object' file generated
1>stdafx.h(12): warning C4005: '_WIN32_WINNT': macro redefinition
1>  C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\include\SDKDDKVer.h(197): note: see previous definition of '_WIN32_WINNT'
1>stdafx.h(13): warning C4005: 'WINVER': macro redefinition
1>  C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\include\SDKDDKVer.h(212): note: see previous definition of 'WINVER'

1 个答案:

答案 0 :(得分:4)

因为#include "targetver.h"包含<sdkddkver.h>已经定义了常量_WIN32_WINNT和WINVER(当它们尚未由构建环境定义时)。

事实上,自动生成的targetver.h会告诉您如何解决此问题:

#pragma once

// Including SDKDDKVer.h defines the highest available Windows platform.

// If you wish to build your application for a previous Windows platform, include WinSDKVer.h and
// set the _WIN32_WINNT macro to the platform you wish to support before including SDKDDKVer.h.

#include <SDKDDKVer.h>

简单的解决方案。只需在包含targetver.h之前定义这些常量。您可能必须使用XP的实际文字值,因为您没有包含定义

的头文件

像这样:

// x501 is XP
#define _WIN32_WINNT        0x0501         
#define WINVER              0x0501  

#include "targetver.h"
#include <windows.h>