UKismetSystemLibrary::PrintString

function Engine Blueprint Since 4.0

#include "Kismet/KismetSystemLibrary.h"

Access: public Specifiers: staticUFUNCTIONBlueprintCallableCallableWithoutWorldContextDevelopmentOnly

Description

Prints a debug string to the screen and/or the Output Log. This is the classic 'Print String' node most Blueprint tutorials start with, and the fastest way to sanity-check game state without attaching a debugger.

Caveats & Gotchas

• Marked DevelopmentOnly — every call compiles out entirely in Shipping and Test builds, so it's unsuitable for anything that must run in a shipped build.
• Repeated calls with the same non-empty Key replace the previous on-screen line rather than stacking new ones, which is useful for per-frame debug values but easy to forget when debugging multiple distinct messages.

Signature

static void PrintString(const UObject* WorldContextObject, const FString& InString = FString(TEXT("Hello")), bool bPrintToScreen = true, bool bPrintToLog = true, FLinearColor TextColor = FLinearColor(0.0f, 0.66f, 1.0f), float Duration = 2.f, const FName Key = NAME_None)

Parameters

Name	Type	Description	Default
WorldContextObject	const UObject*	Object used to resolve the World the message is printed in.	—
InString	const FString&	The text to print.	FString(TEXT("Hello"))
bPrintToScreen	bool	Whether to show an on-screen debug message.	true
bPrintToLog	bool	Whether to also write the message to the Output Log.	true
TextColor	FLinearColor	Color of the on-screen text.	FLinearColor(0.0f, 0.66f, 1.0f)
Duration	float	How long the on-screen message stays visible, in seconds. A negative value falls back to the duration configured in Engine.ini.	2.f
Key	const FName	If non-empty, a later call with the same key replaces the previous on-screen message instead of adding a new line.	NAME_None

Return Type

void

Example

Basic debug print C++

UKismetSystemLibrary::PrintString(this, TEXT("Health changed"), true, true, FLinearColor::Red, 5.0f);

Version History

Introduced in: 4.0

Version	Status	Notes
5.6	stable	—

Feedback

Was this helpful?