In UE4 4.21.2 I am having an issue with the game crashing when I call UWidget::TakeWidget from my GameInstance.
Relevant header code
UPROPERTY(EditAnywhere, BlueprintReadWrite)
TSubclassOf<class UUserWidget> LoadingScreenWidget;
UPROPERTY()
UUserWidget* loadingumg;
TSharedPtr<class SWidget> widgetptr;
Relevant implementation code (LoadingScreenWidget is set in BP, verified in the debugger that it is set)
loadingumg = CreateWidget(this, LoadingScreenWidget);
widgetptr = loadingumg->TakeWidget();
As far as I can see, this should be working based on examples written for older engine versions. If I follow the trace, at widget.cpp:720 the code attempts to access MyWidget, which is null.
UE4Editor_UMG!UWidget::TakeWidget_Private() [d:\build++ue4\sync\engine\source\runtime\umg\private\components\widget.cpp:720] UE4Editor_UMG!UWidget::TakeWidget() [d:\build++ue4\sync\engine\source\runtime\umg\private\components\widget.cpp:709] MyCustomGameInstance::BeginLoadingScreen()
UE4Editor_Engine!UEngine::LoadMap() [d:\build++ue4\sync\engine\source\runtime\engine\private\unrealengine.cpp:11810] UE4Editor_Engine!UEngine::Browse() [d:\build++ue4\sync\engine\source\runtime\engine\private\unrealengine.cpp:11527] UE4Editor_Engine!UGameInstance::StartGameInstance() [d:\build++ue4\sync\engine\source\runtime\engine\private\gameinstance.cpp:498]
UE4Editor!FEngineLoop::Init() [d:\build++ue4\sync\engine\source\runtime\launch\private\launchengineloop.cpp:3053]
UE4Editor!GuardedMain() [d:\build++ue4\sync\engine\source\runtime\launch\private\launch.cpp:161]
UE4Editor!GuardedMainWrapper() [d:\build++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:145]
UE4Editor!WinMain() [d:\build++ue4\sync\engine\source\runtime\launch\private\windows\launchwindows.cpp:276] UE4Editor!__scrt_common_main_seh() [f:\dd\vctools\crt\vcstartup\src\startup\exe_common.inl:283]
kernel32
ntdll
I’m basing my assumption that this code should work on this question: How do you convert a UUserWidget to a SWidget? Needed for a loadingscreen. - UI - Epic Developer Community Forums
Is there some initialization that needs to be done so MyWidget is not null? Has anyone else had this issue?