can’t emit non-existing signal | Godot Café | Page 1

plush widget Sep 27, 2023, 8:21 AM

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signals declared as delegates cannot be emitted from outside of their parent class

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meaning that you can only emit them from method of SignalBus

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i've faced same issue and found no solution to it, so opened issue oh github
https://github.com/godotengine/godot/issues/82268

GitHub

Emitting external custom signals in C# causes an error · Issue #822...

Godot version 4.1.1 stable mono win64 System information Godot v4.1.1.stable.mono - Windows 10.0.19045 - Vulkan (Forward+) - dedicated NVIDIA GeForce RTX 3080 (NVIDIA; 31.0.15.3742) - AMD Ryzen 9 5...

quaint ocean Sep 27, 2023, 8:53 AM

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You need to call EmitSignal on the instance holding the signal. eg: signalBusInstance.EmitSignal(signal_bus.SignalName.OnHealthChanged)

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@plush widget: I'm pretty sure that's the same problem in your GH issue.

plush widget Sep 27, 2023, 9:14 AM

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probably

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though in the same issue AddUserSignal with Connect also didn't work, and both use strings, so i don't see how instances would affect that

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unless you aren't supposed to call Connect on external signals at all

quaint ocean Sep 27, 2023, 9:18 AM

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Connect needs to be called on the instance holding the signal, otherwise it can't find the signal name.

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Signal names aren't global, they're scoped to the class holding them. So you need to call EmitSignal or Connect on the instance that has the signal as a member.

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Or directly call Connect on the signal itself.

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So in your Listener in the GH issue, you need to call EventBus.Instance.Connect("CustomHurt", ...)

#can’t emit non-existing signal