Error C3861 when trying to call a function defined in another file

Development Programming & Scripting
1

I’m getting error message C3861 “function” identifier not found which usually means that the function I’m trying to call is out of scope.

My code is something like this (I excluded a lot of the default code for simplicity, but I have everything that UE4 files should fundamentally need):

QuestComponent.h

public:
void QuestInteraction();

QuestComponent.cpp:

void UQuestComponent::QuestInteraction()
{
// code
}

Interact.cpp
#include “QuestComponent.h”

void UInteract::BeginPlay()
{
Super::BeginPlay();

QuestInteraction(); // line 77
}

Compiling this returns:
(line 77): error C3861 “QuestInteraction”: indentifier not found

I checked Microsoft’s website for the explanation of C3861 but it didn’t help. I’ve already tried everything that they recommended.

Thanks in advance!

2

Because you are calling a Member function.
In order to call these member functions you must have a class instance to call it.
You can also make UInteract a child of UQuestInteraction or make the function static so that you do not need to call it without a class instance (but you need to know when to use static) .
If you do not know what this means then my suggestion is to study C++ a bit more. These issues are C+±related and not UE4 related.

3

But if this were a normal program, all I’d have to do is #include the file with the function in it according to Microsoft.

4

No. If it’s a class non-static member function, you must have an instance of the class in order to call it.
If you do not have experience with C++, I highly recommend learning C++ first before using C++ with Unreal. Or, stick with Blueprints.