qt qInstallMessageHandler 自定义消息输出示例

#include "logmessage.h" #include <QDateTime.h> #include <QFile> #include <QFileInfo> #include <QTextStream> #include <QTextCodec> QString CLogMessage::m_logPath; QMutex CLogMessage::m_mutex; CLogMessage::CLogMessage() { } /** * @brief LogMessage::install 重定向QT的消息输出 * @param log_path 指定输出log，NULL改变输出形式 */ void CLogMessage::install(QString log_path) { m_mutex.lock(); m_logPath = log_path; qInstallMessageHandler(logMessageOut); m_mutex.unlock(); } /** * @brief LogMessage::uninstall。还原QT的消息输出 */ void CLogMessage::uninstall() { m_mutex.lock(); qInstallMessageHandler(0); m_mutex.unlock(); } /** * @brief LogMessage::logMessageOut * @param type * @param context * @param msg * @par 说明 * @code * qDebug()//调试消息 * qInfo()//信息消息 * qWarning()//警告消息和可恢复的错误 * qCritical()//关键错误和系统错误 * qFatal()//致命错误 * @endcode */ void CLogMessage::logMessageOut(QtMsgType type, const QMessageLogContext &context, const QString &msg) { m_mutex.lock(); QByteArray localMsg = msg.toLocal8Bit(); QString strMsg(""); switch(type) { case QtDebugMsg: strMsg = QString("Debug"); break; case QtWarningMsg: strMsg = QString("Warning"); break; case QtCriticalMsg: strMsg = QString("Critical"); break; case QtFatalMsg: strMsg = QString("Fatal"); break; case QtInfoMsg: strMsg = QString("Info"); break; } // 设置输出信息 QString message = QString("[%1]:{%2} File:%3 Line:%4 Function:%5 DateTime:%6") .arg(strMsg).arg(localMsg.constData()).arg(context.file).arg(context.line).arg(context.function) .arg(QDateTime::currentDateTime().toString("yyyy-MM-dd hh:mm:ss ddd") ); // 输出至文件 QFile file(m_logPath); if(true == file.open(QIODevice::ReadWrite | QIODevice::Append)) { QTextStream stream(&file); stream << message << "\r\n"; file.flush(); file.close(); } else { // 转换到中文编码，用于控制台显示 QTextCodec *codec = QTextCodec::codecForName("GBK"); QByteArray encodedStr = codec->fromUnicode(message); fprintf(stderr, "%s",encodedStr.data()); } // 模仿qFatal if(type == QtFatalMsg) abort(); m_mutex.unlock(); }