C++ project compile errors

Development Programming & Scripting C++
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1

I am working on my first project and using C++ to do some work. When I try to build the C++ project I get several errors including UMaterialInstanceConstant* cannot be converted to UMaterialInterface, FActorSpawnParameters is not defined, GEngine is not defined, World is an incomplete class type and cannot be used. If I comment out the line associated with the first issue, and do a full rebuild the build will succeed. But just building causes these errors. I assume that there is something missing from my project but I cannot figure out what?

Any ideas on the causes of these issues?

Thank you

2

That is what I thought with the includes but why would it work with a full rebuild and not a regular build?

As for the code to include not sure what or how much to add here.

I have 2 classes one for the game board and one for pieces. The Grid class has the following includes:
#include “GamePiece.h”
#include “CoreMinimal.h”
#include “GameFramework/Actor.h”
#include “TicTacToeGrid.generated.h”

My Game Piece class has:

#include “CoreMinimal.h”
#include “PaperSpriteActor.h”
#include “GameFramework/Actor.h”
#include “GamePiece.generated.h”

I tried to change CoreMinimal to Core and that did not work. I also tried to include World but that gave more errors.

3

I suppose your classes are not inheriting UObject ?
To narrow down some errors - try to #include "Engine.h"

4

That actually resolved all of these problems. Now I get a message ‘identifier “FDrawingPolicyRenderState” is undefined’ about 80% of the time when I build. If I rebuild the solution than everything works well.

5

Hi, it is very hard to help you without seeing the actual code.
Some of the errors probably means that you are missing some include files.

6

Your solution helped me thanks