介紹

程式碼比較簡單，就是一個函式，在main中呼叫即可

函式申明

void setDebugOutput(const QString &targetFilePath, const bool &argDateFlag = false);

函式實現

void setDebugOutput(const QString &rawTargetFilePath_, const bool &argDateFlag_)
{
    static QString rawTargetFilePath;
    static bool argDateFlag;

    rawTargetFilePath = rawTargetFilePath_;
    argDateFlag = argDateFlag_;

    class HelperClass
    {
    public
 
:
        static void messageHandler(QtMsgType type, const QMessageLogContext &, const QString &message_)
        {
            QString message;

            switch ( type )
            {
                case QtDebugMsg:
                {
                    message = message_;
                    break
 
;
                }
                case QtWarningMsg:
                {
                    message.append("Warning: ");
                    message.append(message_);
                    break;
                }
                case QtCriticalMsg:
                {
                    message.append("Critical: "
 
);
                    message.append(message_);
                    break;
                }
                case QtFatalMsg:
                {
                    message.append("Fatal: ");
                    message.append(message_);
                    break;
                }
                default: { break; }
            }

            QString currentTargetFilePath;

            if ( argDateFlag )
            {
                currentTargetFilePath = rawTargetFilePath.arg( ( ( argDateFlag ) ? ( QDateTime::currentDateTime().toString("yyyy_MM_dd") ) : ( "" ) ) );
            }
            else
            {
                currentTargetFilePath = rawTargetFilePath;
            }

            if ( !QFileInfo::exists( currentTargetFilePath ) )
            {
                QDir().mkpath( QFileInfo( currentTargetFilePath ).path() );
            }

            QFile file( currentTargetFilePath );
            file.open( QIODevice::WriteOnly | QIODevice::Append );

            QTextStream textStream( &file );
            textStream << QDateTime::currentDateTime().toString( "yyyy-MM-dd hh:mm:ss" ) << ": " << message << endl;
        }
    };

    qInstallMessageHandler( HelperClass::messageHandler );
}

注意：記得include需要的標頭檔案

函式使用

• 不動態追加日期

setDebugOutput( "/Users/jason/desktop/log/all.log" );

• 動態追加日期

setDebugOutput( "/Users/jason/desktop/log/%1.log", true );