[UE4]C++实现动态加载UObject：StaticLoadObject()；以Texture和Material为例

相关内容：

C++实现动态加载的问题：LoadClass<T>()和LoadObject<T>()

​​http://aigo.iteye.com/blog/2281558​​

C++静态加载问题：ConstructorHelpers::FClassFinder()和FObjectFinder() 

​​http://aigo.iteye.com/blog/2281373​​

示例1：

动态加载Object的工具方法

Cpp代码

1. 1. 
      
2. UTexture2D* MyTextureLoader::LoadTextureFromPath(const FString& Path)
3. {
4. if (Path.IsEmpty()) return NULL;
5. 
   
6. return Cast<UTexture2D>(StaticLoadObject(UTexture2D::StaticClass(), NULL, *(Path)));
7. }
   1. 
      

调用： Cpp代码

1. 1. 
      
2. FString PathToLoad = "/Game/Textures/YourStructureHere";
3. UTexture2D* tmpTexture = LoadTextureFromPath(PathToLoad);
   1. 
      

示例2：

加载Material和Texture

Cpp代码

1. 1. 
      
2. struct FConstructorStatics
3. {
4. ConstructorHelpers::FObjectFinderOptional<UTexture> TextureFinder;
5. ConstructorHelpers::FObjectFinderOptional<UMaterial> MaterialFinder;
6. FConstructorStatics()
7. : TextureFinder(TEXT("Texture2D'/Game/Textures/2DBackground.2DBackground'"))
8. , MaterialFinder(TEXT("Material'/Game/Materials/DynamicTextureMaterial.DynamicTextureMaterial'"))
9. {
10. }
11. };
12. static FConstructorStatics ConstructorStatics;
13. 
    
14. Texture = ConstructorStatics.TextureFinder.Get();
15. UMaterial* Material = ConstructorStatics.MaterialFinder.Get();
16. DynamicMaterial = UMaterialInstanceDynamic::Create(Material, this);
    1. 
       

设置调用加载好的Material和Texture：

Cpp代码

1. 1. 
      
2. DynamicMaterial->SetTextureParameterValue(FName("DynamicTexture"), Texture);
3. Mesh->SetMaterial(0, DynamicMaterial);
   1. 
      

如果资源永不再使用，想销毁资源对象，代码如下：

Cpp代码

1. 1. 
      
2. Texture2D* mytex; //这里假设mytex合法有效
3. 
   
4. mytex->ConditionalBeginDestroy();
5. mytex = NULL;
6. GetWorld()->ForceGarbageCollection(true);
   1. 
      

Dynamic Asset Loading with C++

​​https://www.youtube.com/watch?v=pJIAmSGxfmQ​​

Dynamic Load Object

​​https://wiki.unrealengine.com/Dynamic_Load_Object​​