DECLARE_DELEGATE problem

Development Programming & Scripting C++
1

I would like to have task that run asynchronously. I am using FNonAbandonableTask. I have made derived class from FNonAbandonableTask, implemented DoWork() function and also would like to know, when my DoWork function has finished their work. I have declared DECLARE_DELEGATE like this:


//.h
DECLARE_DELEGATE(FMessageSaveGameTaskComplete);
class FSaveGameTask : public FNonAbandonableTask
{
public:
    FSaveGameTask(FMessageSaveGameTaskComplete OnTaskComplete);
    ...
    void DoWork();
protected:
    UPROPERTY()
    FMessageSaveGameTaskComplete    _OnTaskCompleteDelegate;
};

//.cpp
FSaveGameTask::FSaveGameTask(FMessageSaveGameTaskComplete OnTaskComplete)
{
    _OnTaskCompleteDelegate = OnTaskComplete;
}

void FSaveGameTask::DoWork()
{
   ...//some work
   _OnTaskCompleteDelegate.ExecuteIfBound();
}

In another class derived from UUserWidget (UInGameUIContainerWidget) I implemented function OnTaskComplete and try to give this function as parameter to my task (when task finished - call OnTaskComplete).


//.h

protected:

    UFUNCTION()
    void OnSaveGameComplete();

In other function create and run my task:


(new FAutoDeleteAsyncTask<FSaveGameTask>(FMessageSaveGameTaskComplete::CreateUObject(this, &UInGameUIContainerWidget::OnSaveGameComplete)))->StartBackgroundTask();

But with no luck. I have received the folowing compiler error:
\UE_4.20\Engine\Source\Runtime\Core\Public\Delegates/DelegateSignatureImpl.inl(197): error C2039: ‘AsShared’: is not a member of ‘UInGameUIContainerWidget’

where UInGameUIContainerWidget is a class derived from UUserWidget.
What I have missed? Please help me with it
Maybe someone know another way how to determine when async task finished his work?

2

You are missing, or just not showing GetStatId(), don’t know if that will resolve the error but it is required:
Otherwise it looks fine.

https://orfeasel.com/implementing-mu…eading-in-ue4/

FORCEINLINE TStatId GetStatId() const

{

RETURN_QUICK_DECLARE_CYCLE_STAT(PrimeCalculationAsyncTask, STATGROUP_ThreadPoolAsyncTasks);

}

3

Thank for you help. I already did it. I found that I had another use of the function


FMessageSaveGameTaskComplete::CreateSP

(stupid mistake) and that caused the problem. Everthing is fine now )))