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      "text": "error C4668: 没有将“WIN32WINNTWIN10TH2”定义为预处理器宏，用“0”替换“#if/#elif”",
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  "contentMarkdown": "# Unreal c++常见问题\n\n> 创建时间：2022/3/24 15:51\n\nUnreal中使用Windows API：\n\nD:\\Windows Kits\\10\\include\\10.0.20348.0\\um\\winnt.h(169): fatal error C1189: #error: \"No Target Architecture\"\n\n![](assets/0011 - Unreal c++常见问题__resource-001-40587206e91b.png)\n\nwinnt.h这个头文件依赖windows.h这个头文件\n\n但是Unreal又不能直接 #include \"windows.h\"，因为一些API有冲突，Unreal在windows的api上包了一层\n\nUnreal用windows的api要用这种形式\n\n![](assets/0011 - Unreal c++常见问题__resource-002-e5bf7196fe8a.png)\n\n<https://forums.unrealengine.com/t/how-to-include-windows-h/308000>\n\n其他相关：<https://stackoverflow.com/questions/4845198/fatal-error-no-target-architecture-in-visual-studio>\n\n## error C4668: 没有将“_WIN32_WINNT_WIN10_TH2”定义为预处理器宏，用“0”替换“#if/#elif”\n\n一般为Windows中的宏和UE4冲突所致，需要用如下头文件包裹冲突的头文件：\n\n#include \"Windows/AllowWindowsPlatformTypes.h\"\n\n#include \"Windows/PreWindowsApi.h\"\n\n#include \"冲突的头文件\"\n\n#include \"Windows/PostWindowsApi.h\"\n\n#include \"Windows/HideWindowsPlatformTypes.h\"\n\n[TODO]Speed Up Shader Compiling\n\n<https://www.techarthub.com/seven-tricks-to-speed-up-shader-compilation-in-unreal-engine-4/>\n\n<https://forums.unrealengine.com/t/turn-off-auto-compile-shaders/353474>\n\n<https://realtimevfx.com/t/ue4-compiling-shaders-is-super-slow/3163/27>\n\n<https://medium.com/gamedev4k/reducing-shader-compile-time-for-unreal-engine-landscape-a7a6c7e2ca20>\n\n程序里include过，VS中不报错，但是编译报错：无法解析外部符号。\n\n很可能在Build文件里面，没有把 依赖的相关模块 添加进来。\n\n![](assets/0011 - Unreal c++常见问题__resource-003-d0b34070d60e.png)\n\nunable to load module:\n\n<https://blog.ch-wind.com/ue4-transition-log/>\n"
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