Passing Data through Flow OutputPins

[mofmn]

I am hoping i can get a small amount of help, I am trying to add communication between actors and graph with structs. I have already added a function that will send structs to actors in a "notifyActorWithStruct" node, and now i have almost succeeded in adding a notifygraphwithstruct node.

The node has received the struct from the actor, but i cannot get it to output to the pin so that the next node can read the value of the Struct. I have been wrestling with this problem all day, and i will admit i am no expert in C++.

Currently i have this attempt, in my onNotifyFromActorWithStruct

UPROPERTY(EditDefaultsOnly, BlueprintReadWrite, Category = "Flow", DisplayName="ReceivedStruct", meta = (SourceForOutputFlowPin = "ReceivedStruct"))
FFlowDataPinOutputProperty_InstancedStruct ReceivedStruct;

Which seems to create the correct output pin, i have also tried methods with FFlowPin and adding it to the outputpins array in the constructor, but this seems more succinct.

and in the .cpp i have

void UFlowNode_OnNotifyFromActorWithStruct::OnNotifyFromComponentWithStruct(UFlowComponent* Component, const FGameplayTag& Tag, const FInstancedStruct& NotifyValue)
{
	if (Component->IdentityTags.HasAnyExact(IdentityTags) && (!NotifyTags.IsValid() || NotifyTags.HasTagExact(Tag)))
	{
		ReceivedStruct.Value = NotifyValue;

		TriggerOutput(TEXT("ReceivedStruct"));
		OnEventReceived();
	}
}

This receives the correct Struct as NotifyValue, as i can see it when breaking the code in VS, but i cant for the life of me figure out how it is supposed to ensure that the pin provides the struct to the downstream node. As far as copilot is concerned i am doing it correctly, but nothing is passed.

Thank you for this plugin, and hope its not too much to ask for assistance, i am hoping there is something pretty obvious that i am doing wrong. The intended workflow here is that an NPC spots the player, sends a struct of the players location to the graph, which then based on narrative state decides what events to send towards the players location.

[mofmn]

So i have been investigating, and i have been trying to follow the logic in the define properties node, and have realised that it doesnt currently pass its pin output to the in input pin on the NotifyActorWithStruct node that i created. I also discovered the interface that is used by the start node that might be involved in retrieving data.

I am currently trying to follow the logic between a define properties node and the timer node, so i can understand how the define properties is passing the float to the timer, as this is a method that i can see working in action.

I think being able to pass structs through the notifies is really useful, as then your desired events can be supplied pretty much any argument you want. and so can provide good generic usage. So i am not going to give up just yet.

[mofmn]

I managed to track through the logic and get it to work. I suspect my code is terrible, but it is functional. I copied logic from the FlowNode_start, so it uses the interface that is in there, but i am slightly confused by it as the define properties node doesn't use the same interface, so i suspect i am using it when i don't need to. Otherwise copying the logic in ResolveCompletionTime() in the timer node allowed me to solve the issue.

I suspect that my code could be improved upon, but i think the functionality it provides is extremely useful, and perhaps with some guidance i could provide the nodes in a pull request. Although i appreciate it might just be easier to implement the same functionality yourself. In which case i would be grateful to compare the code.

Anyway, thanks again for the plugin.