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由于最近在琢磨UE5.4这个引擎，在学习过程中，碰到了一些非常有意思的事情，我在尝试把之前写的一些底层库搬到UE里面，比如底层库，网络库等等，我通过建立module，将这些库用源代码的方式整合进了UE5，因为我一直认为整体编译可以更方便的更改编译条件，因此都是用源代码的方式，比如一个atom的库，编译的C#脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.using System.IO;
using UnrealBuildTool;public class atom : ModuleRules
{public atom(ReadOnlyTargetRules Target) : base(Target){PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;PublicIncludePaths.AddRange(new string[] {// ... add public include paths required here ...});PrivateIncludePaths.AddRange(new string[] {// ... add other private include paths required here ...});PublicDependencyModuleNames.AddRange(new string[]{//"Core",// ... add other public dependencies that you statically link with here ...});PrivateDependencyModuleNames.AddRange(new string[]{//"CoreUObject",//"Engine",// "Slate",// "SlateCore",// ... add private dependencies that you statically link with here ...	});DynamicallyLoadedModuleNames.AddRange(new string[]{// ... add any modules that your module loads dynamically here ...});}
}

非常的简单，甚至屏蔽了所有依赖。 然后在入口的module引用这个库。其编译脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.using System.IO;
using UnrealBuildTool;public class Portal : ModuleRules
{public Portal(ReadOnlyTargetRules Target) : base(Target){PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;PublicIncludePaths.AddRange(new string[] {// ... add public include paths required here ..."atom/code",});PrivateIncludePaths.AddRange(new string[] {// ... add other private include paths required here ...});PublicDependencyModuleNames.AddRange(new string[]{"Core",// ... add other public dependencies that you statically link with here ..."atom"});PrivateDependencyModuleNames.AddRange(new string[]{"CoreUObject","Engine","Slate","SlateCore",// ... add private dependencies that you statically link with here ...	});DynamicallyLoadedModuleNames.AddRange(new string[]{// ... add any modules that your module loads dynamically here ...});}
}

然后在public dependcy里面将该库引入。这样，就可以编译了。

但是问题来了，这个方法只适合客户端模式，不适合编辑器模式！因为客户端可以用静态库，而编辑器模式需要的是动态库。编辑器模式下甚至打不开编辑器。告诉我atom的dll不存在。

这个非常的坑，我想了很多办法都没有办法兼容两种模式。

后来，迫不得已，我只能将这个atom库改成静态库，不参与编译。其新的编译脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.using System.IO;
using UnrealBuildTool;public class atom : ModuleRules
{public atom(ReadOnlyTargetRules Target) : base(Target){//PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;Type = ModuleType.External;PublicIncludePaths.AddRange(new string[] {// ... add public include paths required here ...});PrivateIncludePaths.AddRange(new string[] {// ... add other private include paths required here ...});PublicDependencyModuleNames.AddRange(new string[]{//"Core",// ... add other public dependencies that you statically link with here ...});PrivateDependencyModuleNames.AddRange(new string[]{//"CoreUObject",//"Engine",// "Slate",// "SlateCore",// ... add private dependencies that you statically link with here ...	});DynamicallyLoadedModuleNames.AddRange(new string[]{// ... add any modules that your module loads dynamically here ...});PublicAdditionalLibraries.Add(Path.Combine(ModuleDirectory, "lib", "x64", "atom_Debug.lib"));}
}

主要是将module的类型改成External，不参与编译，同时准备好这个库的静态库。

然后入口module的编译脚本如下：

// Copyright Epic Games, Inc. All Rights Reserved.using System.IO;
using UnrealBuildTool;public class Portal : ModuleRules
{public Portal(ReadOnlyTargetRules Target) : base(Target){PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;PublicIncludePaths.AddRange(new string[] {// ... add public include paths required here ..."atom/code",});PrivateIncludePaths.AddRange(new string[] {// ... add other private include paths required here ...});PublicDependencyModuleNames.AddRange(new string[]{"Core",// ... add other public dependencies that you statically link with here ..."atom",});PrivateDependencyModuleNames.AddRange(new string[]{"CoreUObject","Engine","Slate","SlateCore",// ... add private dependencies that you statically link with here ...	});DynamicallyLoadedModuleNames.AddRange(new string[]{// ... add any modules that your module loads dynamically here ...});}
}

这个地方引入了静态库，再编译，就可以再客户端模式和编辑器模式下一同生效。