1新建專案T33Debug

main.cpp

#include<QDebug>

#include<QFile>

#include<QMutex>//檔案鎖

voidMyMessageHandler(QtMsgTypetype,constQMessageLogContext&context,constQString&msg)

{

//使用一個檔案鎖，當在寫檔案的時候，要等寫完之後才能繼續執行

staticQMutexmutex;

mutex.lock();

QStringstrContext;

//在QMessageLogContext

strContext.sprintf("%s%d%s:\r\n\t",context.file,context.line,context.function);

QStringoutput=strContext+msg+"\r\n";

if(type==QtDebugMsg)

{

QFilefile("debug.log");

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

file.write(output.toUtf8());

file.close();

}

if(type==QtWarningMsg

{

QFilefile("warning.log");

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

file.write(output.toUtf8());

file.close();

}

if(type==QtCriticalMsg)

{

QFilefile("critical.log");

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

file.write(output.toUtf8());

file.close();

}

if(type==QtFatalMsg)

{

QFile

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

file.write(output.toUtf8());

file.close();

}

printf("%s",output.toUtf8().data());

mutex.unlock();

}

intmain()

{

//Tosuppresstheoutputatruntime,installyourownmessage

//handlerwithqInstallMessageHandler().

qInstallMessageHandler(MyMessageHandler);

qDebug()<<"outputdebug";

qDebug("%s,%d","outputdebug",1);

qWarning()<<"warning";

qCritical()<<"cridical";

//可以放開下面的一句，然後發現目錄也有相應的fatal.log檔案

//qFatal("fatalinfo");

}

執行結果：

輸入目錄（E:\QT\build-T33Debug-Desktop_Qt_5_3_MinGW_32bit-Debug）的檔案如下：