Why is my interface function firing before begin play | Unreal Source | Page 1

hardy elbow Jan 12, 2025, 4:05 PM

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Small update.

It happens on AActor::BeginPlay

[0038.59][616]LogTemp: Super::BeginPlay()
[0038.59][616]LogTemp: TESTING ACTOR, OVERRIDE MyNativeFunction
[0038.59][616]LogTemp: TESTING ACTOR HAS STARTED PLAYING
[0038.59][616]LogTemp: Calling C++ Function
[0038.59][616]LogTemp: TESTING ACTOR, OVERRIDE CPP MyInterfaceFunction
[0038.59][616]LogTemp: Calling C++/BP Function
[0038.59][616]LogTemp: TESTING ACTOR, OVERRIDE MyNativeFunction
[0038.59][616]LogTemp: Begin play has ended.

wise knot Jan 12, 2025, 4:05 PM

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look where ReceiveBeginPlay is called within Super::BeginPlay

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should make sense then

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or rather i should just say, ReceiveBeginPlay is called within Super::BeginPlay

hardy elbow Jan 12, 2025, 4:07 PM

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But my ide can't find definiton for ReceiveBeginPlay so i don't know is happening inside

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i saw it is at the end

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but why would it use interface function anyway

wise knot Jan 12, 2025, 4:07 PM

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you're literally calling it?

hardy elbow Jan 12, 2025, 4:07 PM

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no

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void ATestingClass::BeginPlay()
{
    UE_LOGFMT(LogTemp, Log, "Super::BeginPlay()");
    Super::BeginPlay();

    UE_LOGFMT(LogTemp, Log, "TESTING ACTOR HAS STARTED PLAYING");

    UE_LOGFMT(LogTemp, Log, "Calling C++ Function");
    MyInterfaceFunction();

    UE_LOGFMT(LogTemp, Log, "Calling C++/BP Function");
    //MyNativeFunction_Implementation(); // Always run C++
    IMyInterface::Execute_MyNativeFunction(this); // Run Active version
    UE_LOGFMT(LogTemp, Log, "Begin play has ended.");

}

First call is after begin play and logging so 🤷‍♂️

wise knot Jan 12, 2025, 4:08 PM

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in your blueprint...

hardy elbow Jan 12, 2025, 4:08 PM

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yes

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wise knot Jan 12, 2025, 4:09 PM

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hardy elbow Jan 12, 2025, 4:09 PM

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Why is my interface function firing before begin play

hardy elbow Jan 12, 2025, 4:10 PM

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wise knot

yes still yes

wise knot Jan 12, 2025, 4:10 PM

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you run your blueprint graph (ReceiveBeginPlay)

your blueprintgraph runs your function

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oh, wait maybe i see the confusion

hardy elbow Jan 12, 2025, 4:11 PM

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wait, so I counted wrong ?

wise knot Jan 12, 2025, 4:11 PM

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are you expecting that "Parent: BeginPlay" to run the C++ BeginPlay?

hardy elbow Jan 12, 2025, 4:12 PM

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I think it should execute C++ Begin Play which is paren and then run rest of graph

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so all messages should align

wise knot Jan 12, 2025, 4:12 PM

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no, ReceiveBeginPlay and BeginPlay are totally different functions

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BeginPlay is not a BlueprintNativeEvent

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Always found that kind of weird but that's what Epic did

hardy elbow Jan 12, 2025, 4:14 PM

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okok, ye I see, added small delay and seems in order 🤔 . At first I though it is redundant call ;d which could be a problem but its fine

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so whats Parent: BeginPlay ? ReceiveBeginPlay?

wise knot Jan 12, 2025, 4:15 PM

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Yes

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It would call any parent BP Begin Play

hardy elbow Jan 12, 2025, 4:17 PM

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I almost get it 😅

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cause I removed parent beginplay and it still runs my c++ code heh

wise knot Jan 12, 2025, 4:18 PM

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right, C++ BeginPlay is not a BlueprintNativeEvent

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AActor::BeginPlay calls ReceiveBeginPlay

hardy elbow Jan 12, 2025, 4:19 PM

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Where should i put code to be able to override body in editor ?

wise knot Jan 12, 2025, 4:20 PM

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you cannot override ReceiveBeginPlay (BP Begin Play) in C++

hardy elbow Jan 12, 2025, 4:21 PM

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can I define this node in C++ tho? :d

wise knot Jan 12, 2025, 4:21 PM

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that's ReceiveBeginPlay

hardy elbow Jan 12, 2025, 4:21 PM

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so in some child classes I would not use it

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ah

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🤔 ok

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I won't overhtink this too much I dont have such problem atm

#Why is my interface function firing before begin play