Qt文件日志

来源：互联网发布：淘宝在外国怎么样编辑：程序博客网时间：2024/04/29 06:22

#include <QString>

class CFileMessageHandler

public:

    CFileMessageHandler();

    ~CFileMessageHandler();

protected:

   static void myMessageOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg);

   static QString getFileName();

private:

   QtMessageHandler m_holdMsgHandler;

};

#include <QDateTime>

#include <QFile>

#include <QTextStream>

#include <QApplication>

#include <QStandardPaths>

#include <QDir>

CFileMessageHandler::CFileMessageHandler()

    m_holdMsgHandler = qInstallMessageHandler(CFileMessageHandler::myMessageOutput);

CFileMessageHandler::~CFileMessageHandler()

    qInstallMessageHandler(0);

void CFileMessageHandler::myMessageOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)

    QString filename = getFileName();

    QFile file(filename);

    if(file.open(QIODevice::Append))

        QTextStream stream(&file);

        stream << msg;

QString CFileMessageHandler::getFileName()

    QString path = QStandardPaths::writableLocation(QStandardPaths::DataLocation);

    path += "/log";

    QDir dir(path);

    if(!dir.exists())

        dir.mkpath(path);

    QDateTime datetime = QDateTime::currentDateTime();

    QString str = datetime.toString("yyyy_MM_dd");

    QString appName = QApplication::applicationDisplayName();

    path += "/" + appName + str + ".log";

    return path;

使用时，只需要在主函数QApplication a(argc, argv);之后定义一个CFileMessageHandler对象即可。

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