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BP Interfaces don't work with UMG Widgets?

I can't get my BPI to work with UMG widget. The event is placed in the widget blueprint, messenger is a trigger box. When I move event to another BP, for example my character, it works fine, so the problem seems to be widget BP.

Product Version: UE 4.9
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asked Mar 03 '16 at 10:47 PM in Blueprint Scripting

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avatar image Omega Max Mar 30 '17 at 03:32 PM

I keep finding unanswered questions in these forums. Yours was posted 12 months ago! It's a bit disappointing, huh.

avatar image Xosh project Mar 30 '17 at 03:38 PM

Never tried with BP interface, but simple cast to a «your_BP_widget» seem more appropriate for me.

avatar image Omega Max Mar 30 '17 at 03:42 PM

Thanks Xosh! I'm unsure what 'object' a widget cast requires.. Any ideas?

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I have created interface, added to Widget and called it - working as intended. How are you calling interface on the widget? alt text

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answered Mar 30 '17 at 03:43 PM

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avatar image Omega Max Mar 30 '17 at 03:56 PM

My widget is already created in a character BP, elsewhere. So I figured I shouldn't create it again here in my CameraPawnBP.

As it's already created, I've been trying to get it like this:

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(That's inside a Reference Casts macro, by the way.. It runs as part of Event BeginPlay).

Then, also in the CameraPawnBP, I'm sending the interface message to the widget like this:

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But over in the widget, the printstring isn't printing to say that it's received the message:

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avatar image Omega Max Mar 30 '17 at 04:01 PM

For clarification: It's a CameraPawnControllerBP.. Not a CameraPawnBP.

avatar image intoxicat3 Mar 30 '17 at 04:30 PM

You are sure that CommanderHUDRef isn't null? Add a print string there with name of it.

Btw if you copied interface event from different blueprint it won't work, you need to add it again by hand.

avatar image Omega Max Mar 30 '17 at 04:59 PM

Right—nothing printed.. So I suppose it was null..

So I'm now trying to cast the Widget directly but I'm not sure what kind of object it needs..

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