[C++]Can not spawn Blueprint when run in packaged game

Development Programming & Scripting Blueprint
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1

First Sorry for my poor english.
I want to spawn an Blueprint.
Here is the code:

    auto UOL = UObjectLibrary::CreateLibrary(AActor::StaticClass(),true, GIsEditor);
UOL->AddToRoot();
UOL->LoadBlueprintAssetDataFromPath(TEXT("/Game/TestField/BP/"));
TArray<FAssetData> FADT;
UOL->GetAssetDataList(FADT);
if (FADT.Num() <= 0)
{
	GEngine->AddOnScreenDebugMessage(-1, 5, FColor::Green, "AssetFaild");
	return;
}
UBlueprint* bp = Cast<UBlueprint>(FADT[0].GetAsset());
if (bp)
{
	GEngine->AddOnScreenDebugMessage(-1, 5, FColor::Green, "CastSucesssful");
	if(GetWorld()->SpawnActor<AActor>(bp->GeneratedClass, FVector(0,0,300), GetActorRotation()))
		GEngine->AddOnScreenDebugMessage(-1, 5, FColor::Green, "SpawnSucesssful");
}

I find it works fine when game is play in editor.but when I use it in packaged game,the Cast will failed.
I’m sure that the blueprint has been cooked.
How to fix it?

2

UBlueprint isn’t available at runtime, which is why the cast fails.

You’ll want to get the generated class for the BP using the meta-data from the asset:

if (const FString* GeneratedClassMetaData = FADT[0].TagsAndValues.Find("GeneratedClass"))
{
    const FString ClassPath = FPackageName::ExportTextPathToObjectPath(*GeneratedClassMetaData);
    UClass* BlueprintClass = LoadObject<UClass>(nullptr, *ClassPath);
    // ... BlueprintClass is the same as bp->GeneratedClass in your code
}
3

Awesome! It works.Thanks a lot!