UE4 Reference Sheet

ue4-reference.md

Logging

Creating a log category

To create a new log category, first declare a log category in a header file.

// ClassName.h

DECLARE_LOG_CATEGORY_EXTERN(LogCategoryName, Log, All);

Second, define the category in an implementation file.

// ClassName.cpp

DEFINE_LOG_CATEGORY(LogCategoryName);

Adding a log message

Use the UE_LOG macro to print a log to the output window (editor) or to the log (game).

UE_LOG(LogCategoryName, Log|Error|Warning, TEXT("Log text."));