我有一个VS2015 C++项目。应用必须同时在Windows 7和XP上运行。因此,我想将_WIN32_WINNTWINVER设置为_WIN32_WINNT_WINXP

这是我的项目的stdafx.h的样子:

stdafx.h

#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'

最佳答案

因为#include "targetver.h"包括<sdkddkver.h>,当构建环境尚未定义常量_WIN32_WINNT和WINVER时,它们已经定义了常量_WIN32_WINNT和WINVER。

事实上,自动生成的targetver.h会告诉您确切的解决方法:

#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,因为您没有包含用于定义XP的头文件

像这样:
// x501 is XP
#define _WIN32_WINNT        0x0501
#define WINVER              0x0501

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

关于c++ - '_WIN32_WINNT'/ 'WINVER' : macro redefinition,我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/41376557/

10-09 06:37