如何修改 Visual Studio 中 Windows SDK 路径的宏定义
Visual Studio 2022 有时候莫名其妙地在不能正常编译（可能是装多个 SDK 造成的），找不到 `ctype.h` 等头文件。在项目的 VC++ 目录定义中发现是 SDK 宏定义出错了，比如正常路径是 `C:\Program Files (x86)\Windows Kits`，但变成了 `C:\Program Files \Windows Kits` 或 `D:\Windows Kits` 等。但是这些宏定义在 IDE 中是不能修改的，需要在系统注册表中修改。
!(https://file.mculoop.com/images/2022/11/2022-11-10_202155_1668090486.jpg)
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缺 `ctype.h` 时 是 `$(UCRTContentRoot)` 的定义出错了，它是在 `C:\Program Files (x86)\Windows Kits\10\DesignTime\CommonConfiguration\Neutral\uCRT.props` 文件中被定义的：
```
<Project xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<PropertyGroup>
<UCRTContentRoot Condition="'$(UCRTContentRoot)' == ''">$(Registry:HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Kits\Installed Roots@KitsRoot10)</UCRTContentRoot>
<UCRTContentRoot Condition="'$(UCRTContentRoot)' == ''">$(Registry:HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Kits\Installed Roots@KitsRoot10)</UCRTContentRoot>
<TargetUniversalCRTVersion Condition="'$(TargetUniversalCRTVersion)' == ''">$(TargetPlatformVersion)</TargetUniversalCRTVersion>
<UniversalCRT_IncludePath>$(UCRTContentRoot)Include\$(TargetUniversalCRTVersion)\ucrt;</UniversalCRT_IncludePath>
<UniversalCRT_LibraryPath_x86>$(UCRTContentRoot)lib\$(TargetUniversalCRTVersion)\ucrt\x86;</UniversalCRT_LibraryPath_x86>
<UniversalCRT_LibraryPath_x64>$(UCRTContentRoot)lib\$(TargetUniversalCRTVersion)\ucrt\x64;</UniversalCRT_LibraryPath_x64>
<UniversalCRT_LibraryPath_arm>$(UCRTContentRoot)lib\$(TargetUniversalCRTVersion)\ucrt\arm;</UniversalCRT_LibraryPath_arm>
<UniversalCRT_LibraryPath_arm64>$(UCRTContentRoot)lib\$(TargetUniversalCRTVersion)\ucrt\arm64;</UniversalCRT_LibraryPath_arm64>
<UniversalCRT_SourcePath>$(UCRTContentRoot)Source\$(TargetUniversalCRTVersion)\ucrt;</UniversalCRT_SourcePath>
</PropertyGroup>
</Project>
```
可以看到，SDK 的根路径在注册表的 `HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Kits\Installed Roots@KitsRoot10` 或 `HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows Kits\Installed Roots@KitsRoot10`，找到它并修改成正确的路径重启 VS 即可。
!(https://file.mculoop.com/images/2022/11/image-20221110223510824_1668090911.png)
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