打印屏幕

默认打印屏幕

// 打印至屏幕

FString screenMessage = "(AddOnScreenDebugMessage)    Hello world!";

GEngine->AddOnScreenDebugMessage(-1, 1.f, FColor::Green, screenMessage);

// 打印至屏幕

UKismetSystemLibrary::PrintString(this, "(UKismetSystemLibrary::PrintString)   Hello world!");

输出log

默认类别打印log

UE_LOG(LogTemp, Log, TEXT("(UE_LOG-logTemp)    Hello world!"));

自定义类别打印log

// .h 自定义日志分类

DECLARE_LOG_CATEGORY_CLASS(GMDebugLog, Log, All);

// .cpp 输出日志 自定义分类

UE_LOG(GMDebugLog, Warning, TEXT("(UE_LOG-logTemp)    Hello world!"));

UE_LOG(GMDebugLog, Error, TEXT("(UE_LOG-GMDebugLog)    Hello world!"));

带变量打印log



//创建FString 变量 FString::Printf

FString playerName = "User";

int32 healthValue = 100;

FString outputMessage1 = FString::Printf(TEXT("Name is %s, health value is %d"), *playerName, healthValue);

UE_LOG(LogTemp, Warning, TEXT("FStringFormatArg: %s"), *outputMessage1);

//创建FString变量 FString::Format

TArray<FStringFormatArg> args;

args.Add(FStringFormatArg(playerName));

args.Add(FStringFormatArg(healthValue));

FString outputMessage2 = FString::Format(TEXT("Name is {0}, health value is  {1}"), args);

UE_LOG(LogTemp, Warning, TEXT("FString::Format: %s"), *outputMessage2);

巴特西

【UE4 C++】打印字符串与输出日志

打印屏幕

输出log

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