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UE_LOG详解

UE_LOG详解

作者: SilenceTT | 来源:发表于2022-02-11 11:54 被阅读0次

    游戏模式:

    在游戏模式下,你需要在游戏的快捷方式后面加 -Log,才会在游戏中显示。

    编辑器模式(Play In Editor):

    你可以在Output窗口中看到log信息。

    如果想在游戏中看到,需要到Engin.ini中修改参数添加"GameCommandLine=-log,如果没有,则需要按~,输入-Log命令开启。

    快速使用:

    UE_LOG(LogTemp, Warning, TEXT("Your message"));
    

    设置拥有自己标签的Log:

    在你的游戏头文件中加入:

    //General Log
    DECLARE_LOG_CATEGORY_EXTERN(YourLog, Log, All);
     
    //Logging during game startup
    DECLARE_LOG_CATEGORY_EXTERN(YourInit, Log, All);
     
    //Logging for your AI system
    DECLARE_LOG_CATEGORY_EXTERN(YourAI, Log, All);
     
    //Logging for Critical Errors that must always be addressed
    DECLARE_LOG_CATEGORY_EXTERN(YourCriticalErrors, Log, All);
    
    

    这样输出的Log你就可以知道是哪个部分的,这也是UE_Log很有用的原因。
    在你的游戏Cpp文件中:

    //General Log
    DEFINE_LOG_CATEGORY(YourLog);
     
    //Logging during game startup
    DEFINE_LOG_CATEGORY(YourInit);
     
    //Logging for your AI system
    DEFINE_LOG_CATEGORY(YourAI);
     
    //Logging for Critical Errors that must always be addressed
    DEFINE_LOG_CATEGORY(YourCriticalErrors);
    

    Log格式:

    Log Message

    //"This is a message to yourself during runtime!"
    UE_LOG(YourLog,Warning,TEXT("This is a message to yourself during runtime!"));
    

    Log an FString

     %s strings are wanted as TCHAR* by Log, so use *FString()
    //"MyCharacter's Name is %s"
    UE_LOG(YourLog,Warning,TEXT("MyCharacter's Name is %s"), *MyCharacter->GetName() );
    

    Log an Int

    //"MyCharacter's Health is %d"
    UE_LOG(YourLog,Warning,TEXT("MyCharacter's Health is %d"), MyCharacter->Health );
    

    Log a Float

    //"MyCharacter's Health is %f"
    UE_LOG(YourLog,Warning,TEXT("MyCharacter's Health is %f"), MyCharacter->Health );
    

    Log an FVector

    //"MyCharacter's Location is %s"
    UE_LOG(YourLog,Warning,TEXT("MyCharacter's Location is %s"), 
        *MyCharacter->GetActorLocation().ToString());
    

    Log an FName

    //"MyCharacter's FName is %s"
    UE_LOG(YourLog,Warning,TEXT("MyCharacter's FName is %s"), 
        *MyCharacter->GetFName().ToString());
    

    Log an FString,Int,Float

    //"%s has health %d, which is %f percent of total health"
    UE_LOG(YourLog,Warning,TEXT("%s has health %d, which is %f percent of total health"),
        *MyCharacter->GetName(), MyCharacter->Health, MyCharacter->HealthPercent);
    

    Log的颜色设置:

    //"this is Grey Text"
    UE_LOG(YourLog,Log,TEXT("This is grey text!"));
    //"this is Yellow Text"
    UE_LOG(YourLog,Warning,TEXT("This is yellow text!"));
    //"This is Red Text"
    UE_LOG(YourLog,Error,TEXT("This is red text!"));
    

    可以看得出第二个参数是是用来控制颜色的。

    传递客户端信息(网络模式):

    PlayerController->ClientMessage("Your Message");
    

    命令行命令以及Engine.ini配置:

    Log conventions (in the console, ini files, or environment variables)

    [cat] = a category for the command to operate on, or 'global' for all categories.
    标签,没有设置就显示所有的Log
    [level] = verbosity level, one of: none, error, warning, display, log, verbose, all, default
    关卡,显示某某关卡的Log
    

    Log console command usage

    Log list - list all log categories
    Log list [string] - list all log categories containing a substring
    Log reset - reset all log categories to their boot-time default Log [cat] - toggle the display of the category [cat]
    Log [cat] off - disable display of the category [cat]
    Log [cat] on - resume display of the category [cat]
    Log [cat] [level] - set the verbosity level of the category [cat]
    Log [cat] break - toggle the debug break on display of the category 
    

    Log command line

    -LogCmds=\"[arguments],[arguments]...\"           - applies a list of console commands at boot time
    -LogCmds=\"foo verbose, bar off\"         - turns on the foo category and turns off the bar category
    

    Environment variables

    Any command line option can be set via the environment variable UE-CmdLineArgs

    set UE-CmdLineArgs=\"-LogCmds=foo verbose breakon, bar off\"
    

    Config file

    In DefaultEngine.ini or Engine.ini:

    [Core.Log] 
    global=[default verbosity for things not listed later]
    [cat]=[level]
    foo=verbose break</pre>
    

    后面的一篇文章提供了显示代码行号、函数名称、类名等功能:
    https://wiki.unrealengine.com/Logs,_Printing_the_Class_Name,_Function_Name,_Line_Number_of_your_Calling_Code!

    转载自Ue4的UE_LOG - 湛蓝玫瑰 - 博客园 (cnblogs.com)

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