[SOLVED]Issue getting UWindDirectionalSourceComponent from AWindDirectionalSource

Development Programming & Scripting C++
1

Hi all,

I’m trying to set the WindSpeed on the UWindDirectionalSourceComponent of my AWindDirectionalSource but am getting a fatal error LNK1120: 1 unresolved externals. I’ve included the Header file etc and tried every permutation I can think of (noob c++ guy here i’m afraid).


// Increase Wind
//UWindDirectionalSourceComponent* windsourcecomponent = WindSourceActor->GetComponent();
//windsourcecomponent->SetSpeed(0.5f);
WindSourceActor->GetComponent()->SetSpeed(0.5f);
//if (WindSourceSystem)WindSourceSystem->SetSpeed(0.5f);

You can see from the above the different things i’ve tried.

Error Message thus…


1>     Creating library H:\UE4 Projects\MM2EE_UE4\Intermediate\Build\Win64\UE4Editor\Development\MM2\UE4Editor-MM2-2342.suppressed.lib and object H:\UE4 Projects\MM2EE_UE4\Intermediate\Build\Win64\UE4Editor\Development\MM2\UE4Editor-MM2-2342.suppressed.exp
1>Module.MM2.cpp.obj : error LNK2019: unresolved external symbol "public: void __cdecl UWindDirectionalSourceComponent::SetSpeed(float)" (?SetSpeed@UWindDirectionalSourceComponent@@QEAAXM@Z) referenced in function "private: void __cdecl AWeatherManager::ProcessWeatherStateChange(void)" (?ProcessWeatherStateChange@AWeatherManager@@AEAAXXZ)
1>H:\UE4 Projects\MM2EE_UE4\Binaries\Win64\UE4Editor-MM2-2342.dll : fatal error LNK1120: 1 unresolved externals

Any help greatly received.

Many thanks in advance,
Matt.

2

For some stupid reason, the WindDirectionalSourceComponent is tagged with MinimalAPI which means you can’t call any of it’s functions from your own Project (it’s not exported - which is why you’re getting a LINK error).

WindDirectionalSourceComponent is just a container for properties, it doesn’t actually do anything - so my advice would be to just create your own component / actor that copies what it does - and change the references to your own component type.

Alternatively, if you’re working from engine source, remove the MinimalAPI flag and add ENGINE_API to the original component.

3

Many thanks for the reply TheJamsh!

I’ve got around the issue by exposing the function to Blueprints. You can call the Setters from there.

Thanks again.