UE5 C++: 插件编写04 | 自动增加前缀

准备工作

**`UObject* Asset`**

UObject* Asset 通常指的是一个指向UObject的指针。UObject是Unreal Engine中的基类，几乎所有的引擎对象都继承自UObject。这个指针可以引用任何派生自UObject的对象，比如蓝图、材质、贴图、音频资源等资产。

如果你看到UObject* Asset，它通常用于指向一个已加载或正在使用的引擎资产。你可以使用UObject*来动态加载资产。例如，使用StaticLoadObject()函数从文件路径加载一个资产。

UObject* Asset = StaticLoadObject(UObject::StaticClass(), nullptr, TEXT("/Game/MyAssetPath.MyAsset"));

Data Structure

TArray<FString> PrefixArray	Slow in look up(查找缓慢）
TMap<UClass*,FString> PrefixMap	Fast in look up

inside the map you will have two elements, one is the key, one is the value

and for the key, it is our UClass (material/texture/blueprint)

TMap<UClass*, FString> PrefixMap

类型映射（TMap），它将一个键值对映射起来。

UClass* 是指向一个类对象的指针。UClass 示类的元类对象，通过 UClass*，可以引用 UE里的各种类类型, 如material，texture，blueprint。
FString 是一个字符串类型，存储文本数据，对应地如"M_" "T_" "BP_"。

build-in function

PrefixMap.Find(SelectedObject->GetClass())

includes and TPairs

#include "Materials/Material.h"
#include "Materials/MaterialInstanceConstant.h"
#include "Sound/SoundCue.h"
#include "Sound/SoundWave.h"
#include "Engine/Texture.h"
#include "Blueprint/UserWidget.h"
#include "Components/SkeletalMeshComponent.h"
#include "NiagaraSystem.h"
//#include "NiagaraEmitter.h"

       {UBlueprint::StaticClass(),TEXT("BP_")},
       {UStaticMesh::StaticClass(),TEXT("SM_")},
       {UMaterial::StaticClass(), TEXT("M_")},
       {UMaterialInstanceConstant::StaticClass(),TEXT("MI_")},
       {UMaterialFunctionInterface::StaticClass(), TEXT("MF_")},
       {USoundCue::StaticClass(), TEXT("SC_")},
       {USoundWave::StaticClass(), TEXT("SW_")},
       {UTexture::StaticClass(), TEXT("T_")},
       {UTexture2D::StaticClass(), TEXT("T_")},
       {UUserWidget::StaticClass(), TEXT("WBP_")},
       {USkeletalMeshComponent::StaticClass(), TEXT("SK_")},
       {UNiagaraSystem::StaticClass(), TEXT("NS_")},
//{UNiagaraEmitter::StaticClass(), TEXT("NE_")}

示例代码

quickAssetAction.h

// Fill out your copyright notice in the Description page of Project Settings.
#pragma once
#include "CoreMinimal.h"
#include "AssetActionUtility.h"#include "Materials/Material.h"
#include "Materials/MaterialInstanceConstant.h"
//#include "Particles/ParticleSystem.h"    
#include "Sound/SoundCue.h"
#include "Sound/SoundWave.h"
#include "Engine/Texture.h"
#include "Blueprint/UserWidget.h"
#include "Components/SkeletalMeshComponent.h"
#include "NiagaraSystem.h"
//#include "NiagaraEmitter.h"    
#include "QuickAssetAction.generated.h"//should be the last one, otherwise will have error/*** */
UCLASS()
class SUPERMANAGER_API UQuickAssetAction : public UAssetActionUtility
{GENERATED_BODY()public://UFUNCTION(CallInEditor)//void TestFuckingFunc();UFUNCTION(CallInEditor)void BatchDuplication(int32 NumOfDuplicates);UFUNCTION(CallInEditor)void AddPrefixes();private:TMap<UClass*, FString>PrefixMap ={{UBlueprint::StaticClass(),TEXT("BP_")},{UStaticMesh::StaticClass(),TEXT("SM_")},{UMaterial::StaticClass(), TEXT("M_")},{UMaterialInstanceConstant::StaticClass(),TEXT("MI_")},{UMaterialFunctionInterface::StaticClass(), TEXT("MF_")},//{UParticleSystem::StaticClass(), TEXT("PS_")},{USoundCue::StaticClass(), TEXT("SC_")},{USoundWave::StaticClass(), TEXT("SW_")},{UTexture::StaticClass(), TEXT("T_")},{UTexture2D::StaticClass(), TEXT("T_")},{UUserWidget::StaticClass(), TEXT("WBP_")},{USkeletalMeshComponent::StaticClass(), TEXT("SK_")},{UNiagaraSystem::StaticClass(), TEXT("NS_")},//{UNiagaraEmitter::StaticClass(), TEXT("NE_")}};};

quickAssetAction.cpp


void UQuickAssetAction::AddPrefixes()
{TArray<UObject*>SelectedObjects = UEditorUtilityLibrary::GetSelectedAssets();uint32 Counter = 0;for (UObject* SelectedObject : SelectedObjects){if (!SelectedObject) continue;//空指针检查  SelectedObject 是 nullptrFString* PrefixFound = PrefixMap.Find(SelectedObject->GetClass());//这一行查找 SelectedObject 对象对应的类（SelectedObject->GetClass()）在 PrefixMap 中的值。// PrefixMap 是一个自己命名的TMap<UClass*, FString>键值对的映射，// 其中键是 UClass*（对象的类）如material，值是 FString（M_）。if (!PrefixFound || PrefixFound->IsEmpty()){Print(TEXT("Failed to find prefix for class ") + SelectedObject->GetClass()->GetName(), FColor::Red);continue;}FString OldName = SelectedObject->GetName();if (OldName.StartsWith(*PrefixFound)){Print(OldName + TEXT(" already has prefix added"), FColor::Red);continue;}const FString NewNameWithPrefix = *PrefixFound + OldName;UEditorUtilityLibrary::RenameAsset(SelectedObject, NewNameWithPrefix);++Counter;//将计数器 Counter 的值增加 1。它用于记录处理了多少个对象。//在脚本完成后，下面那串代码输出一条信息，例如 "成功处理了 X 个对象"。}if(Counter>0){ShowNotifyInfo(TEXT("Successfully renamed " + FString::FromInt(Counter) + " assets"));}
}