本篇博文介绍了，如果在UE 中如何使用第三方库，及制作成插件的方法。
DLL 文件是上篇文章中创键的具体的方法见上篇文章。下面开始介绍方法
首先，创建一个空白的 UE5 C++ 项目，然后再创建一个空白内容的插件，如下图所示
修改UeWllApi.uplugin 里面的内容 如下图所示
在 插件的文件夹中 ，添加文件夹及DLL,LIB,.H 文件（注意具体的路径不要错否则可能插件制作不成功）如下图所示
首先在插件中添加一个ThridParty的文件夹（文件夹名字不要错）如下图所示
然后在ThridParty 内再添加一个文件夹（WllApi）如下图所示
然后在 WllApi 里面添加三个文件夹 bin,inc,lib(名字不要错)如下图所示
然后再bin ,lib，分别添加x64 文件夹 inc 里面添加WllApi 文件夹 如下图所示
然后再bin ,lib,的x64文件夹下添加 Debug,Release 文件夹，然后在Debug,Release 里面添加对应的Dll ,lib文件，在inc 里面的WllApi文件夹下添加需要的头文件.如下图所示
在 插件的的Build.cs （UeWllApi.Build.cs）中添加以下代码
// Copyright Epic Games, Inc. All Rights Reserved.
using System.IO;
using UnrealBuildTool;public class UeWllApi : ModuleRules
{public UeWllApi(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 ... "Projects"});DynamicallyLoadedModuleNames.AddRange(new string[]{// ... add any modules that your module loads dynamically here ...});LoadPlugins(Target);}public void LoadPlugins(ReadOnlyTargetRules Target){bool bSupport = false;string BinPath = "", LibPath = "";//初始化BIN,LIB路径为空string PluginPath = Path.Combine("ThridParty", "WllApi");PrivateIncludePaths.Add(Path.Combine(PluginDirectory,PluginPath,"inc"));if(Target.Platform==UnrealTargetPlatform.Win64){if(Target.Configuration==UnrealTargetConfiguration.Debug){BinPath = Path.Combine(PluginPath, "bin", "x64", "Debug");LibPath = Path.Combine(PluginPath, "lib", "x64", "Debug");}else{BinPath = Path.Combine(PluginPath, "bin", "x64", "Release");LibPath = Path.Combine(PluginPath, "lib", "x64", "Release");}bSupport = true;}if(bSupport){PublicAdditionalLibraries.Add(Path.Combine(PluginDirectory, LibPath, "FirstDll.lib"));PublicDelayLoadDLLs.Add("FirstDll.dll");RuntimeDependencies.Add(Path.Combine("$(PluginDir)", BinPath, "FirstDll.dll"));}}
}还有要注意添加 “Projects” 模块
具体结果如下图所示
在UeWllApi.h中添加以下代码，如下图所示
public :static constexpr wchar_t* ModuleName{ L"UeWllApi" };//插件的名字
public:/** IModuleInterface implementation */virtual void StartupModule() override;virtual void ShutdownModule() override;
public:static FName GetModularFeatureName(){static FName FeatureName = FName(ModuleName);return FeatureName;}static inline IModuleInterface& Get(){return FModuleManager::LoadModuleChecked<IModuleInterface>(ModuleName);}static inline bool IsAvailable()//是否可以获得{return FModuleManager::Get().IsModuleLoaded(ModuleName);}
private:FString GetLibaryPath();void* LibraryHandle = nullptr;
在UeWllApi.cpp中添加以下代码，如下图所示
#include "UeWllApi.h"
#include"Misc/MessageDialog.h"//消息框头文件
#include "Interfaces/IPluginManager.h"//插件管理头文件
#define LOCTEXT_NAMESPACE "FUeWllApiModule"void FUeWllApiModule::StartupModule()
{FString LibraryPath = GetLibaryPath();LibraryHandle = LibraryPath.IsEmpty() ? nullptr : FPlatformProcess::GetDllHandle(*LibraryPath);//当前的路径是否为空，不为空的话获取句柄if (!LibraryHandle){FMessageDialog::Open(EAppMsgType::Ok, LOCTEXT("ThridPartyLibraryError", "Failed to load WllApi Library"));}
}void FUeWllApiModule::ShutdownModule()
{FPlatformProcess::FreeDllHandle(LibraryHandle);//释放句柄LibraryHandle = nullptr;
}
FString FUeWllApiModule::GetLibaryPath()
{FString BaseDir = IPluginManager::Get().FindPlugin(ModuleName)->GetBaseDir();//寻找插件FString LibraryPath;
#if PLATFORM_WINDOWS
# if PLATFORM_64BITS
# if UE_BUILD_DEBUGLibraryPath = FPaths::Combine(*BaseDir, TEXT("ThridParty/WllApi/bin/x64/Debug/FirstDll.dll"));
# elseLibraryPath = FPaths::Combine(*BaseDir, TEXT("ThridParty/WllApi/bin/x64/Release/FirstDll.dll"));
# endif
# else
# if UE_BUILD_DEBUGLibraryPath = FPaths::Combine(*BaseDir, TEXT("ThridParty/WllApi/bin/x86/Debug/FirstDll.dll"));
# elseLibraryPath = FPaths::Combine(*BaseDir, TEXT("ThridParty/WllApi/bin/x86/Release/FirstDll.dll"));
# endif
# endif
#endifreturn LibraryPath;}
#undef LOCTEXT_NAMESPACEIMPLEMENT_MODULE(FUeWllApiModule, UeWllApi)
添加C++类型的Blueprint Function Library，如下图所示，运行时是插件
在UeWllApiFunctionLibrary.h 添加以下代码，如下图所示
public:UFUNCTION(BlueprintCallable,Category="UeWllApi")static int GetSum();
在UeWllApiFunctionLibrary.cpp 添加以下代码 如图所示
int UUeWllApiFunctionLibrary::GetSum()
{return sum(3,4);
}
到此为止插件就制作完成了，只要打包调用就可以了，可以看到在本程序内可以调用结果也正确
打包出来，在其他程序调用也正确，结果如下图所示
