UE4 如何写插件

事先说明各个版本的插件写法还是有点区别的我的是基于4.15版本的。

第一种：普通的插件

然后添加一个CPP放在插件的Private下，命名为：插件名+PricatePCH.h文件  这里的插件名为Test，以下以Test为示例讲解：

包含Test的.h文件

#include "Test.h"

在Test.cpp里
把#include “Test.h” 替换成#include "TestPrivatePCH.h" 这样一部分就好了

然后新建自己的代码.h放入Public文件夹里，.cpp放进Private里 这里以TestBPLibrary为例

接下来就和普通的Actor C++代码差不多写法了，只要记得在cpp里添加PCH.h就可以了

.h

// Copyright 1998-2016 Epic Games, Inc. All Rights Reserved.#pragma once#include "Engine.h"#include "TestBPLibrary.generated.h"/* *Function library class.*Each function in it is expected to be static and represents blueprint node that can be called in any blueprint.**When declaring function you can define metadata for the node. Key function specifiers will be BlueprintPure and BlueprintCallable.*BlueprintPure - means the function does not affect the owning object in any way and thus creates a node without Exec pins.*BlueprintCallable - makes a function which can be executed in Blueprints - Thus it has Exec pins.*DisplayName - full name of the node, shown when you mouse over the node and in the blueprint drop down menu.*Its lets you name the node using characters not allowed in C++ function names.*CompactNodeTitle - the word(s) that appear on the node.*Keywords -the list of keywords that helps you to find node when you search for it using Blueprint drop-down menu. *Good example is "Print String" node which you can find also by using keyword "log".*Category -the category your node will be under in the Blueprint drop-down menu.**For more info on custom blueprint nodes visit documentation:*https://wiki.unrealengine.com/Custom_Blueprint_Node_Creation*/UCLASS()class UTestBPLibrary : public UBlueprintFunctionLibrary{GENERATED_UCLASS_BODY()UFUNCTION(BlueprintCallable, meta = (DisplayName = "Execute Sample function nimei ", Keywords = "Test sample test testing"), Category = "TestPlugins")static float TestSampleFunction(float Param);UFUNCTION(BlueprintCallable, Category = "TestPlugins") //测试staticint32 Ttest(int32 a);};

.cpp

// Copyright 1998-2016 Epic Games, Inc. All Rights Reserved.#include "TestPrivatePCH.h"#include "TestBPLibrary.h"UTestBPLibrary::UTestBPLibrary(const FObjectInitializer& ObjectInitializer): Super(ObjectInitializer){}float UTestBPLibrary::TestSampleFunction(float Param){return -1;}int32 UTestBPLibrary::Ttest(int32 a) //测试{return -1;}

第二种：基于Object的插件

手先找到引擎目录下例如：D:\Epic Games\UE_4.15\Engine\Plugins\Developer 下面的UObjectPlugin，复制整个文件夹到插件目录下，需要在插件Bulid.cs下"Engine"

然后老样子添加PCH.h文件

#include "IUObjectPlugin.h"#include "GameFramework/Actor.h"//这行看你要做什么Object 这里做的是Actor#include "Engine.h"#include "CoreUObject.h"

把MyPluginObject.h的#include "CoreMinimal.h"注释掉
把IUObjectPlugin.h的#include "CoreMinimal.h"和"Modules/ModuleInterface.h"注释掉
把UObjectPlugin.cpp的全部注释掉并加上#include "UObjectPluginPrivatePCH.h"

把MyPluginObject.cpp加上#include "UObjectPluginPrivatePCH.h"和#include "ObjectTools.h"

下面同样添加自己的代码  这里我命名为ZZActor

.h

#pragma once#include "GameFramework/Actor.h"#include "ZZActor.generated.h"UCLASS()class AZZActor : public AActor{GENERATED_BODY()public:// Sets default values for this actor's propertiesAZZActor();UFUNCTION(BlueprintCallable, Category = "objectPlugins") //测试int32 testzz(int32 a);};

.cpp

#include "UObjectPluginPrivatePCH.h"#include "ZZActor.h"AZZActor::AZZActor():Super(){}int32 AZZActor::testzz(int32 a) //测试{return -1;}

然后就可以在项目里新建蓝图看到了

下面是我分享的代码http://download.csdn.net/detail/u014532636/9853274

PS（新版的插件）改成类似

public BBB(ReadOnlyTargetRules Target) : base(Target){PCHUsage = ModuleRules.PCHUsageMode.UseExplicitOrSharedPCHs;PublicIncludePaths.AddRange(new string[] {"BBB/Public"// ... add public include paths required here ...});}