[UE4]C++实现动态加载的问题：LoadClass()和LoadObject()

 

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

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

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

http://aigo.iteye.com/blog/2268056

 

动态加载UObject和动态加载UClass的两个全局函数分别是：

LoadClass<T>() 、LoadObject<T>()，均在在UObjectGlobals.h中

 

 

// Load an object.
template< class T > 
inline T* LoadObject( UObject* Outer, const TCHAR* Name, const TCHAR* Filename=nullptr, uint32 LoadFlags=LOAD_None, UPackageMap* Sandbox=nullptr )
{
	return (T*)StaticLoadObject( T::StaticClass(), Outer, Name, Filename, LoadFlags, Sandbox );
}

 

 

 

// Load a class object.
template< class T > 
inline UClass* LoadClass( UObject* Outer, const TCHAR* Name, const TCHAR* Filename=nullptr, uint32 LoadFlags=LOAD_None, UPackageMap* Sandbox=nullptr )
{
	return StaticLoadClass( T::StaticClass(), Outer, Name, Filename, LoadFlags, Sandbox );
}

 

 

 

官方还没出文档，只能先看代码注释：

/**
 * Find or load an object by string name with optional outer and filename specifications.
 * These are optional because the InName can contain all of the necessary information.
 *
 * @param ObjectClass	The class (or a superclass) of the object to be loaded.
 * @param InOuter		An optional object to narrow where to find/load the object from
 * @param InName		String name of the object. If it's not fully qualified, InOuter and/or Filename will be needed
 * @param Filename		An optional file to load from (or find in the file's package object)
 * @param LoadFlags		Flags controlling how to handle loading from disk
 * @param Sandbox		A list of packages to restrict the search for the object
 * @param bAllowObjectReconciliation	Whether to allow the object to be found via FindObject in the case of seek free loading
 *
 * @return The object that was loaded or found. NULL for a failure.
 */
COREUOBJECT_API UObject* StaticLoadObject( UClass* Class, UObject* InOuter, const TCHAR* Name, const TCHAR* Filename = NULL, uint32 LoadFlags = LOAD_None, UPackageMap* Sandbox = NULL, bool bAllowObjectReconciliation = true );
COREUOBJECT_API UClass* StaticLoadClass(UClass* BaseClass, UObject* InOuter, const TCHAR* Name, const TCHAR* Filename = NULL, uint32 LoadFlags = LOAD_None, UPackageMap* Sandbox = NULL);

 

 

使用示例：

UTexture2D* Tex = LoadObject<UTexture2D>(NULL, TEXT("Texture2D'/Game/Textures/UI/tex_test001'"));

 

 

另外有两个全局函数叫：StaticLoadObject()和StaticLoadClass()，应该是LoadObject<T>()和LoadClass<T>()的早期版本，前者需要手动强转，后者使用模版封装过，使用更方便，推荐使用后者