LatentAction function with arguments?

Development Programming & Scripting C++
1

hi! I am async loading some assets and I want to use a delegate function with parameters but
FlatentActionInfo looks like this:

FLatentActionInfo info;
info.CallbackTarget = this;
info.ExecutionFunction = "myLoadInc";
info.Linkage = 0;

how can I call a delegate function with parameters?
I want to call

myLoadInc(FName Item)

instead just

 myLoadInc();

Thanks!!
Dany

1 Like
2

Can you show the context and code within which your attempt is?

3 
void ALevel_Main_CPP::myAssetsLoader()
{
	TArray<FName> Levels = {"MENU","Roulette","Factory", "Train", "Learned"};
	
	FLatentActionInfo info;
	info.CallbackTarget = this;
	info.ExecutionFunction = "myLoadInc(thisName)"; /// I want to call myLoadInc using public thisName
	info.Linkage = 0;
	int32 UUID = 1000;
	
	for ( auto &level : Levels )
	{
		info.UUID = UUID;
		UGameplayStatics::LoadStreamLevel(this,level,false,false,info);
		thisName = level.ToString(); ///this name is public
		UUID++;
	}
}

void ALevel_Main_CPP::myLoadInc(FString levelName)
{
	levelName = "LEVEL - " + levelName + " - LOADED!";
	GEngine->AddOnScreenDebugMessage(-1, 15.0f, FColor::White, levelName);
	myLoadCounts++;
	if (myLoadCounts == 15) createSkip();
}
4

ummm I think what I want to do is not possible in a simple way as this is an async proccess, name of the variable will change (actually will always show the last one because would run all LoadStreamLevel lines before the first myLoadInc callback.

5

I’ve been looking through the code for this for a while, and I’ve gotta say, I have no freaking idea.

1 Like
6

bump, still nothing on whole of internet answering the question

my current hack to fix this problem:

check how your latent calls its complete function, for me im doing FStreamLevelAction and when its done it calls Response.FinishAndTriggerIf(true, LatentInfo.ExecutionFunction, LatentInfo.Linkage, LatentInfo.CallbackTarget);

which means all i have to work with is Linkage, an int32.
so for my callback function it is just OnLevelLoaded(int32 Linkage)

i construct my latent info:

FLatentActionInfo LatentInfo;
LatentInfo.CallbackTarget = this;
static const FName OnLevelLoaded = TEXT("OnLevelLoaded");
LatentInfo.ExecutionFunction = OnLevelLoaded;
LatentInfo.UUID = NewPlayer->GetUniqueID();
LatentInfo.Linkage = LatentInfo.UUID;

I pair Linkage to Newplayer (this is just a tmap<int32, struct> as a global in the class):

FPlayerLoginLevelRequest PlayerLoginLevelRequest;
PlayerLoginLevelRequest.PC = NewPlayer;
PlayerLoginLevelRequest.LevelName = MapName;
PlayersLoggingIn.Add(LatentInfo.UUID, PlayerLoginLevelRequest);

Then i fire off the latent function…

Now when the latent is finished it calls this:

void AArkWelderGameMode::OnLevelLoaded(int32 Linkage)
{
	const FPlayerLoginLevelRequest& PlayerLoginLevelRequest = PlayersLoggingIn.FindChecked(Linkage);

	//do stuff

	PlayersLoggingIn.Remove(Linkage);
}

and thats how i transfer “arguments” to latent action callback
really ugly but idk what else to do