Editor crash after adding struct in C++

[wormpattern]

Hello,

I have added struct to project using add code to project. Everything compiles, but once I load editor it crashes.
From the debug it looks like this call from generated file crashes.

ReturnPackage = CastChecked<UPackage>(StaticFindObjectFast(UPackage::StaticClass(), NULL, FName(TEXT("/Script/Uprising")), false, false));

Error: Cast of NULL to Package failed

What can be cause?

Cheers

[Moss]

Could you post the code from the struct you just added?

[wormpattern]

@Moss;162323

Could you post the code from the struct you just added?

Sure thing, it was just to test actualy so nothing special

.h file

#pragma once

include “UnitStuct.generated.h”

/**
*
*/
USTRUCT(BlueprintType)
//USTRUCT()
struct Funit_struct
{
GENERATED_USTRUCT_BODY()

	/*UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "UnitStruct")
	FText txtUnitName;*/

	UPROPERTY()
	//UPROPERTY(EditAnywhere, BlueprintReadWrite, Category = "UnitStruct")
	int8 intUnitStrenght;

	Funit_struct();

};

.cpp file

include “Uprising.h”
include “UnitStuct.h”

Funit_struct::Funit_struct()
{
intUnitStrenght = 0;
}

[Moss]

I see that you are using the standard c++ ctor. An USTRUCT is a bit different and the constructor must go within a #if CPP block. Try this one (no .cpp file in my case, all in the header):

//
// UnitStuct.h
//

#pragma once

#include "UnitStuct.generated.h"

/**
 * Unit struct with default construictor to initialize values
 */
USTRUCT()
struct Funit_struct
{
	GENERATED_USTRUCT_BODY()

	UPROPERTY()
	int8 intUnitStrenght;

#if CPP
	Funit_struct() :
		intUnitStrenght(0)
	{
		// Default constructor
	}
#endif
};

Cheers,
Moss

[wormpattern]

@Moss;162530

I see that you are using the standard c++ ctor. An USTRUCT is a bit different and the constructor must go within a #if CPP block. Try this one (no .cpp file in my case, all in the header):

Cheers,
Moss

Hello Moss,

Thanks for the reply, adding if cpp made it failed as well. But I noticed you didnt used USTRUCT() before declaring struct, which I had. So I removed it and it didnt crash.
I wanted to make it visible in bluprints that why I used USTRUCT(BlueprintType).

Another funny thing. Removing USTRUCT made it work. But if I rebuild solution it says no generated h file found.
I need to add back USTRUCT, rebuild, remove USTRUCT() and then it works after build (not rebuild). Preatty much weird behavior.

[Moss]

@wormpattern;162552

Thanks for the reply, adding if cpp made it failed as well. But I noticed you did’nt used USTRUCT() before declaring struct, which I had.

D-oh! That was a mistak on mt part the USTRUCT() must be there.

Is that 'Uprising script yours? Are you using the struct in it?

[wormpattern]

Uprising is project name and script is generated with option generate project files. I didnt modify it.

[wormpattern]

I managed to find solution, apears you need to have dummy class created (derived for example from actor). You cant have just struct added to project.

[Moss]

Strange, might be a bug then.