Unreal Editor crashes if I log InputComponent (Lec79 - Introducing Input Binding)

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#1

This is a really strange issue. The editor crashes if I have the block of code as below in which I check for the InputComponent:

if (InputComponent)
{
	//Input Compnent is found
	UE_LOG(LogTemp, Warning, TEXT("Input component found"))
}
else
{
	UE_LOG(LogTemp, Error, TEXT("%s missing input component"), *GetOwner()->GetName())
}

If I comment out this block of code then everything works fine. So I guess this is where the problem lies.

I have checked the Editor logs in the project folder (since the Editor crashes I cannot access the Output log there) and this is what I found there:

[2017.02.04-16.29.36:438][470]LogWindows:Error: === Critical error: ===
[2017.02.04-16.29.36:438][470]LogWindows:Error: 
[2017.02.04-16.29.36:438][470]LogWindows:Error: Fatal error: [File:D:\Build\++UE4+Release-4.13+Compile\Sync\Engine\Source\Runtime\Launch\Private\Windows\LaunchWindows.cpp] [Line: 83] 
[2017.02.04-16.29.36:439][470]LogWindows:Error: SECURE CRT: Invalid parameter detected.
[2017.02.04-16.29.36:439][470]LogWindows:Error: Expression: Unknown Function: Unknown. File: Unknown Line: 0
[2017.02.04-16.29.36:439][470]LogWindows:Error: 
[2017.02.04-16.29.36:439][470]LogWindows:Error: 
[2017.02.04-16.29.36:439][470]LogWindows:Error: 
[2017.02.04-16.29.36:439][470]LogWindows:Error: KERNELBASE.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Core.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Core.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Core.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor.exe
[2017.02.04-16.29.36:439][470]LogWindows:Error: ucrtbase.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: ucrtbase.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: ucrtbase.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: ucrtbase.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: ucrtbase.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Core.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-BuildingEscape-828.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Engine.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Engine.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Engine.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Engine.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Engine.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Engine.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-Engine.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-UnrealEd.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-UnrealEd.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-UnrealEd.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-UnrealEd.dll
[2017.02.04-16.29.36:439][470]LogWindows:Error: UE4Editor-UnrealEd.dll
[2017.02.04-16.29.36:440][470]LogWindows:Error: UE4Editor.exe
[2017.02.04-16.29.36:440][470]LogWindows:Error: UE4Editor.exe
[2017.02.04-16.29.36:440][470]LogWindows:Error: UE4Editor.exe
[2017.02.04-16.29.36:440][470]LogWindows:Error: UE4Editor.exe
[2017.02.04-16.29.36:440][470]LogWindows:Error: UE4Editor.exe
[2017.02.04-16.29.36:440][470]LogWindows:Error: KERNEL32.DLL
[2017.02.04-16.29.36:440][470]LogWindows:Error: ntdll.dll
[2017.02.04-16.29.36:440][470]LogWindows:Error: ntdll.dll
[2017.02.04-16.29.36:440][470]LogWindows:Error: 
[2017.02.04-16.29.36:459][470]LogExit: Executing StaticShutdownAfterError
[2017.02.04-16.29.36:462][470]LogWindows: FPlatformMisc::RequestExit(1)
[2017.02.04-16.29.36:462][470]Log file closed, 02/04/17 17:29:36

Can anyone point me in the right direction please?

#2

Willing to bet it’s this line. Are you calling this code in the constructor? It won’t have an Owner until BeginPlay

#3

Thank you for the response, Dan.

I am calling it in BeginPlay(), as done by Ben in his videos.

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

	UE_LOG(LogTemp, Warning, TEXT("Grabber reporting for duty"));
	// ...
	///Look for attached Physics Handle

	PhysicsHandle = GetOwner()->FindComponentByClass<UPhysicsHandleComponent>();
	if (PhysicsHandle)
	{
		//Physics handle is found
	}
	else
	{
		UE_LOG(LogTemp, Error, TEXT("%s missing physics handle component" ), *GetOwner()->GetName())
	}

	InputComponent = GetOwner()->FindComponentByClass<UInputComponent>();
	if (InputComponent)
	{
		//Input Compnent is found
		UE_LOG(LogTemp, Warning, TEXT("Input component found"))
	}
	else
	{
		UE_LOG(LogTemp, Error, TEXT("%s missing input component"), *GetOwner()->GetName())
	}

}
#4

And commenting out everything from InputComponent = GetOwner()->FindComponentByClass<UInputComponent>(); makes it not crash? Seems strange. Did you try rebuilding your solution?

#5

Yes, I did. Funnily enough, it just started working. I tried rebuilding (multiple times) and restarting my PC but to no avail. I am a bit flummoxed as to why it just started working (automatically after an hour or so) but I guess it is resolved for now.

Thanks anyway.

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