Load UMG using StaticLoadObject from the asset under FPaths::GamePersistentDownloadDir()

Development Programming & Scripting C++
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1

hi, I am trying to implemente my own hot patch system for mobile game, but there has some issue when trying to load UMG assets.

I have two UMG assets under following folder:

MyProject\Content\NewWidgetBlueprint.uasset
MyProject\PersistentDownloadDir\NewWidgetBlueprint.uasset

I can dynamically load my widget under Content/ using following method:

{
	FString PackagePathName = "/Game/NewWidgetBlueprint";
	UWidgetBlueprint* test1 = Cast<UWidgetBlueprint>(StaticLoadObject(UWidgetBlueprint::StaticClass(), NULL, *PackagePathName));
	UUserWidget* pUserWidget = nullptr;
	if (test1) {
		auto widget = CreateWidget<UUserWidget>(this, test1->GeneratedClass);
		// do something
		//widget->AddToViewport();
	}
}

But how could I load UMG assets under FPaths::GamePersistentDownloadDir()?

I am trying following path, but load nothing, test2 always be nullptr.

{  // What is package name of GamePersistentDownloadDir?
	FString PackagePathName = "/GamePersistentDownloadDir/NewWidgetBlueprint";
	UWidgetBlueprint* test2 = Cast<UWidgetBlueprint>(StaticLoadObject(UWidgetBlueprint::StaticClass(), NULL, *PackagePathName));
	UUserWidget* pUserWidget = nullptr;
	if (test2) {
		auto widget = CreateWidget<UUserWidget>(this, test2->GeneratedClass);
		//widget->AddToViewport();
	}
}

Any suggestion will be appreciated.

2

finally find out solution…

need to register Mount Point first:

FPackageName::RegisterMountPoint(“DLC”, FPaths::GamePersistentDownloadDir());