技術標籤：UE4虛幻4-C ++

在寫外掛或者資源動態載入的過程中，需要對Content目錄下的資產檔案進行遍歷或者檢索
參考內容：UE4非同步載入資源

Object Libraries 是Content Browser 用來進行資產篩選和顯示的類，在遊戲邏輯中也可以使用。

 //標頭檔案
#include "Engine/ObjectLibrary.h"
// 宣告
UObjectLibrary* ObjectLibrary;  
TArray<FSoftObjectPath> assetPath;
// 函式實現
void AResReference::ObjectLibraryOperate
 
()
{
	if (!ObjectLibrary)
	{
		ObjectLibrary = UObjectLibrary::CreateLibrary(UObject::StaticClass(),false,false);
		ObjectLibrary->AddToRoot();
	}

	// 檢索路徑
	ObjectLibrary->LoadAssetDataFromPath(TEXT("/Game/Res"));
	TArray<FAssetData> assetData;
	ObjectLibrary->GetAssetDataList(
 
assetData);
	
	for (int i=0;i<assetData.Num();++i)
	{
		assetPath.AddUnique(assetData[i].ToSoftObjectPath());
	}
}

FStreamableManager可以實現對傳遞它的FSoftObjectPath資源路徑進行載入操作

// 標頭檔案
#include "Engine/StreamableManager.h"
// 宣告
FStreamableManager* assetLoader;
TSharedPtr<FStreamableHandle> assetHandle;
 

assetLoader= new FStreamableManager();
// AResReference 自建的類的名稱
assetHandle= assetLoader->RequestAsyncLoad(assetPath, 
FStreamableDelegate::CreateUObject(this, &AResReference::StreambleManagerLoadComplete));

載入成功後，進行圖片資源篩選

// 圖片陣列
TArray<UTexture2D*> TextureGroup;
void AResReference::StreambleManagerLoadComplete()
{
	TArray<UObject*> OutObject;
	assetHandle->GetLoadedAssets(OutObject);
	for (int i=0;i<OutObject.Num();i++)
	{
		UTexture2D* workTexture = Cast<UTexture2D>(OutObject[i]);
		if (workTexture)
		{
			TextureGroup.Add(workTexture);
		}
	}
	
FTimerDelegate UpdateTextureDele = 
FTimerDelegate::CreateUObject(this, &AResReference::UpdateTexture);
GetWorld()->GetTimerManager().SetTimer(UpdateTextureHandle, UpdateTextureDele, 1.f, true);
}