C++ 4.19 Transition Guide

[NuLL3rr0r]

@NuLL3rr0r

According to the official documentation at AddOnScreenDebugMessage | Unreal Engine 5.2 Documentation the signature for AddOnScreenDebugMessage is as follows:

AddOnScreenDebugMessage
(
uint64 Key,
float TimeToDisplay,
FColor DisplayColor,
const FString & DebugMessage,
bool bNewerOnTop,
const FVector2D & TextScale
)

AddOnScreenDebugMessage
(
int32 Key,
float TimeToDisplay,
FColor DisplayColor,
const FString & DebugMessage,
bool bNewerOnTop,
const FVector2D & TextScale
)

The signature did not changed from 4.18 but the behavior did. Now it won’t work for us with key set to anything other than -1 (INDEX_NONE). Any FString passed with key other than INDEX_NONE won’t apper on the screen. Unfortunately, tt breaks our logging system and I cannot figure out why.

For anyone coming across this: it’s definitely a bug and now there is a pull request for it at https://github.com/EpicGames/UnrealEngine/pull/4675.