QT输出调试日志
程序调试中需要保存qDebug的打印信息，首先想到的是Linux重定向输出到一个文件中，但是qdebug不行。google发现Qt已经自带了保存log的方法。
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#include
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#include
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#include
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void customMessageHandler(QtMsgType type, const char *msg)
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{
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QString txt;
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switch (type) {
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//调试信息提示
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case QtDebugMsg:
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txt = QString(
"Debug: %1").arg(msg);
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break;
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//一般的warning提示
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case QtWarningMsg:
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txt = QString(
"Warning: %1").arg(msg);
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break;
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//严重错误提示
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case QtCriticalMsg:
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txt = QString(
"Critical: %1").arg(msg);
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break;
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//致命错误提示
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case QtFatalMsg:
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txt = QString(
"Fatal: %1").arg(msg);
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abort();
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}
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QFile outFile1("debuglog1.txt");
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QFile outFile2("debuglog2.txt");
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outFile1.open(QIODevice::WriteOnly | QIODevice::Append);
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if(outFile1.size() >=
1024*
10 )
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{
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outFile1.close();
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outFile2.remove();
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QFile::copy(
"debuglog1.txt",
"debuglog2.txt");
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outFile1.remove();
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QFile outFile3("debuglog1.txt");
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outFile3.open(QIODevice::WriteOnly | QIODevice::Append);
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QTextStream ts(&outFile3);
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ts << txt <<
endl;
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}
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else
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{
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QTextStream ts(&outFile1);
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ts << txt <<
endl;
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}
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}
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int main(int argc, char *argv[])
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{
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QApplication a(argc, argv);
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qInstallMsgHandler(customMessageHandler);
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MainServer mainWin;
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mainWin.show();
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return a.exec();
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}
debuglog1.txt 如果大于10k了，就复制到debuglog2.txt,同时删除debuglog1.txt,重新开始写
PS:bool QFile::copy ( const QString & fileName, const QString & newName ) [static]
This is an overloaded function.
Copies the file fileName to newName. Returns true if successful; otherwise returns false.
If a file with the name newName already exists, copy() returns false (i.e., QFile will not overwrite it).