Qt 定制qDebug() 信息到log文件

Qt中有qInstallMsgHandler 方法可以去定制消息发生后的回调函数，它回调同时还有qDebug的级别信息。这样我们可以方便把错误消息定制到自己的log文件里面

如下：

#include <QtDebug>#include <QFile>#include <QTextStream> //回调函数实现debug信息到文件void customMessageHandler(QtMsgType type, const char *msg){QString txt;switch (type) {case QtDebugMsg:txt = QString("Debug: %1").arg(msg);break; case QtWarningMsg:txt = QString("Warning: %1").arg(msg);break;case QtCriticalMsg:txt = QString("Critical: %1").arg(msg);break;case QtFatalMsg:txt = QString("Fatal: %1").arg(msg);abort();} QFile outFile("debug.log");outFile.open(QIODevice::WriteOnly | QIODevice::Append);QTextStream ts(&outFile);ts << txt << endl;} int main( int argc, char * argv[] ){QApplication app( argc, argv ); //这个方法注册回调函数       qInstallMsgHandler(customMessageHandler);...return app.exec();}

?