Qt: qDebug 등 출력 형식 맞 춤 형

void testMessagePattern() {

    QString QT_MESSAGE_PATTERN=

            "[%{if-debug}D%{endif}%{if-warning}W%{endif}%{if-critical}C%{endif}%{if-fatal}F%{endif}]"

            ": %{file}:%{line} - %{message}";

    qSetMessagePattern(QT_MESSAGE_PATTERN);

 
  
    qDebug() << "Hello Pattern";
  
    qDebug() << QString("  ").toUtf8().toHex();
  
}
  

   
  

[D]: /Users/Biao/Dropbox/workspace/Qt/Test/main.cpp:26 - Hello Pattern 
[D]: /Users/Biao/Dropbox/workspace/Qt/Test/main.cpp:28 - "e9bb84e5bdaa" 

   
void qSetMessagePattern(const QString & pattern)
Changes the output of the default message handler.
Allows to tweak the output of qDebug(), qWarning(), qCritical() and qFatal().
Following placeholders are supported:

   
   
   
   
Placeholder 
Description 
%{appname} 
QCoreApplication::applicationName() 
%{file} 
Path to source file 
%{function} 
Function 
%{line} 
Line in source file 
%{message} 
The actual message 
%{pid} 
QCoreApplication::applicationPid() 
%{threadid} 
ID of current thread 
%{type} 
"debug", "warning", "critical" or "fatal" 
You can also use conditionals on the type of the message using %{if-debug}, %{if-warning}, %{if-critical} or %{if-fatal} followed by an %{endif}. What is inside the%{if-*} and %{endif} will only be printed if the type matches.
Example:
QT_MESSAGE_PATTERN="[%{if-debug}D%{endif}%{if-warning}W%{endif}%{if-critical}C%{endif}%{if-fatal}F%{endif}] %{file}:%{line} - %{message}"
The default pattern is "%{message}".
The pattern can also be changed at runtime by setting the QT_MESSAGE_PATTERN environment variable; if both qSetMessagePattern() is called and QT_MESSAGE_PATTERN is set, the environment variable takes precedence.
qSetMessagePattern() has no effect if a custom message handler is installed.
This function was introduced in QtCore 5.0.
See also qInstallMessageHandler() and Debugging Techniques.