How to create a simple USTRUCT in c++?

Development Programming & Scripting C++
1

Hi, I have tried to create a simple USTRUCT in c++.
I created a new header file called MyStruct.h


#pragma once

#include "CoreMinimal.h"
#include "MyStruct.generated.h"

USTRUCT(BlueprintType)
struct MyStruct
{
    GENERATED_BODY()

        UPROPERTY(BlueprintReadWrite)
        int myNumber;
};

It complains that i does not know what USTRUCT is. And refuses to compile.
I cant find any info on how this is set up. Please help :slight_smile:

2

My errors:
E0077 this declaration has no storage class or type specifier (for the USTRUCT keyword)
E0020 identifier “BlueprintType” is undefined

3

If you haven’t already, close out of the editor and VS, and then right click on the uproject file and click Generate Visual Studio Files. Then re-open VS and you should be good.

When you create a new header file, you need to let the engine create the generated.h file. This is how you do that.

5

All Structs need to be prefixed with F, and you shouldn’t use native CPP types. The struct should be declared like this:



USTRUCT(BlueprintType)
struct FMyStruct
{
    GENERATED_BODY()
public:
    UPROPERTY(BlueprintReadWrite)
    int32 myNumber;
};

You DO NOT need to close and regenerate project files each time you create a new header! This is a common misconception - UHT will recreate the generated headers that it needs to everytime you build the project.

6

Thanks for your suggestions. Unfortunatly, neither fixed my issue.
Visual Studio asks me if I want to reimport the files after I generate them.
Unfortunatly, the generated header file remains non-existant.
(Could this be because I inherit from Object and dont inherit from Actor?)