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夥計們，我假設按類型來劃分，例如警告和信息日誌應該被保存在其他文件...以下是QXmpp庫的類QXmppLogger，它保存所有將日誌類型記錄到一個文件中，但我必須按照前面所述的方式完成它。任何人都可以指導我通過如何編寫自己的日誌類
PS 我不能更改QXmppLogger類！
QXmppLogger.h
#ifndef QXMPPLOGGER_H
#define QXMPPLOGGER_H
#include <QObject>
#include "QXmppGlobal.h"
#ifdef QXMPP_LOGGABLE_TRACE
#define qxmpp_loggable_trace(x) QString("%1(0x%2) %3").arg(metaObject()->className(), QString::number(reinterpret_cast<qint64>(this), 16), x)
#else
#define qxmpp_loggable_trace(x) (x)
#endif
class QXmppLoggerPrivate;
/// \brief The QXmppLogger class represents a sink for logging messages.
///
/// \ingroup Core
class QXMPP_EXPORT QXmppLogger : public QObject
{
Q_OBJECT
Q_ENUMS(LoggingType)
Q_FLAGS(MessageType MessageTypes)
Q_PROPERTY(QString logFilePath READ logFilePath WRITE setLogFilePath)
Q_PROPERTY(LoggingType loggingType READ loggingType WRITE setLoggingType)
Q_PROPERTY(MessageTypes messageTypes READ messageTypes WRITE setMessageTypes)
public:
/// This enum describes how log message are handled.
enum LoggingType
{
NoLogging = 0, ///< Log messages are discarded
FileLogging = 1, ///< Log messages are written to a file
StdoutLogging = 2, ///< Log messages are written to the standard output
SignalLogging = 4, ///< Log messages are emitted as a signal
};
/// This enum describes a type of log message.
enum MessageType
{
NoMessage = 0, ///< No message type
DebugMessage = 1, ///< Debugging message
InformationMessage = 2, ///< Informational message
WarningMessage = 4, ///< Warning message
ReceivedMessage = 8, ///< Message received from server
SentMessage = 16, ///< Message sent to server
AnyMessage = 31, ///< Any message type
};
Q_DECLARE_FLAGS(MessageTypes, MessageType)
QXmppLogger(QObject *parent = 0);
~QXmppLogger();
static QXmppLogger* getLogger();
QXmppLogger::LoggingType loggingType();
void setLoggingType(QXmppLogger::LoggingType type);
QString logFilePath();
void setLogFilePath(const QString &path);
QXmppLogger::MessageTypes messageTypes();
void setMessageTypes(QXmppLogger::MessageTypes types);
public slots:
virtual void setGauge(const QString &gauge, double value);
virtual void updateCounter(const QString &counter, qint64 amount);
void log(QXmppLogger::MessageType type, const QString& text);
void reopen();
signals:
/// This signal is emitted whenever a log message is received.
void message(QXmppLogger::MessageType type, const QString &text);
private:
static QXmppLogger* m_logger;
QXmppLoggerPrivate *d;
};
/// \brief The QXmppLoggable class represents a source of logging messages.
///
/// \ingroup Core
class QXMPP_EXPORT QXmppLoggable : public QObject
{
Q_OBJECT
public:
QXmppLoggable(QObject *parent = 0);
protected:
/// \cond
virtual void childEvent(QChildEvent *event);
/// \endcond
/// Logs a debugging message.
///
/// \param message
void debug(const QString &message)
{
emit logMessage(QXmppLogger::DebugMessage, qxmpp_loggable_trace(message));
}
/// Logs an informational message.
///
/// \param message
void info(const QString &message)
{
emit logMessage(QXmppLogger::InformationMessage, qxmpp_loggable_trace(message));
}
/// Logs a warning message.
///
/// \param message
void warning(const QString &message)
{
emit logMessage(QXmppLogger::WarningMessage, qxmpp_loggable_trace(message));
}
/// Logs a received packet.
///
/// \param message
void logReceived(const QString &message)
{
emit logMessage(QXmppLogger::ReceivedMessage, qxmpp_loggable_trace(message));
}
/// Logs a sent packet.
///
/// \param message
void logSent(const QString &message)
{
emit logMessage(QXmppLogger::SentMessage, qxmpp_loggable_trace(message));
}
signals:
/// Sets the given \a gauge to \a value.
void setGauge(const QString &gauge, double value);
/// This signal is emitted to send logging messages.
void logMessage(QXmppLogger::MessageType type, const QString &msg);
/// Updates the given \a counter by \a amount.
void updateCounter(const QString &counter, qint64 amount = 1);
};
Q_DECLARE_OPERATORS_FOR_FLAGS(QXmppLogger::MessageTypes)
#endif // QXMPPLOGGER_H
這裏是QXmppLogger.cpp
#include <iostream>
#include <QChildEvent>
#include <QDateTime>
#include <QFile>
#include <QMetaType>
#include <QTextStream>
#include "QXmppLogger.h"
QXmppLogger* QXmppLogger::m_logger = 0;
static const char *typeName(QXmppLogger::MessageType type)
{
switch (type)
{
case QXmppLogger::DebugMessage:
return "DEBUG";
case QXmppLogger::InformationMessage:
return "INFO";
case QXmppLogger::WarningMessage:
return "WARNING";
case QXmppLogger::ReceivedMessage:
return "RECEIVED";
case QXmppLogger::SentMessage:
return "SENT";
default:
return "";
}
}
static QString formatted(QXmppLogger::MessageType type, const QString& text)
{
return QDateTime::currentDateTime().toString() + " " +
QString::fromLatin1(typeName(type)) + " " +
text;
}
static void relaySignals(QXmppLoggable *from, QXmppLoggable *to)
{
QObject::connect(from, SIGNAL(logMessage(QXmppLogger::MessageType,QString)),
to, SIGNAL(logMessage(QXmppLogger::MessageType,QString)));
QObject::connect(from, SIGNAL(setGauge(QString,double)),
to, SIGNAL(setGauge(QString,double)));
QObject::connect(from, SIGNAL(updateCounter(QString,qint64)),
to, SIGNAL(updateCounter(QString,qint64)));
}
/// Constructs a new QXmppLoggable.
///
/// \param parent
QXmppLoggable::QXmppLoggable(QObject *parent)
: QObject(parent)
{
QXmppLoggable *logParent = qobject_cast<QXmppLoggable*>(parent);
if (logParent) {
relaySignals(this, logParent);
}
}
/// \cond
void QXmppLoggable::childEvent(QChildEvent *event)
{
QXmppLoggable *child = qobject_cast<QXmppLoggable*>(event->child());
if (!child)
return;
if (event->added()) {
relaySignals(child, this);
} else if (event->removed()) {
disconnect(child, SIGNAL(logMessage(QXmppLogger::MessageType,QString)),
this, SIGNAL(logMessage(QXmppLogger::MessageType,QString)));
disconnect(child, SIGNAL(setGauge(QString,double)),
this, SIGNAL(setGauge(QString,double)));
disconnect(child, SIGNAL(updateCounter(QString,qint64)),
this, SIGNAL(updateCounter(QString,qint64)));
}
}
/// \endcond
class QXmppLoggerPrivate
{
public:
QXmppLoggerPrivate(QXmppLogger *qq);
QXmppLogger::LoggingType loggingType;
QFile *logFile;
QString logFilePath;
QXmppLogger::MessageTypes messageTypes;
private:
QXmppLogger *q;
};
QXmppLoggerPrivate::QXmppLoggerPrivate(QXmppLogger *qq)
: loggingType(QXmppLogger::NoLogging),
logFile(0),
logFilePath("QXmppClientLog.log"),
messageTypes(QXmppLogger::AnyMessage),
q(qq)
{
}
/// Constructs a new QXmppLogger.
///
/// \param parent
QXmppLogger::QXmppLogger(QObject *parent)
: QObject(parent)
{
d = new QXmppLoggerPrivate(this);
// make it possible to pass QXmppLogger::MessageType between threads
qRegisterMetaType<QXmppLogger::MessageType>("QXmppLogger::MessageType");
}
QXmppLogger::~QXmppLogger()
{
delete d;
}
/// Returns the default logger.
///
QXmppLogger* QXmppLogger::getLogger()
{
if(!m_logger)
m_logger = new QXmppLogger();
return m_logger;
}
/// Returns the handler for logging messages.
///
QXmppLogger::LoggingType QXmppLogger::loggingType()
{
return d->loggingType;
}
/// Sets the handler for logging messages.
///
/// \param type
void QXmppLogger::setLoggingType(QXmppLogger::LoggingType type)
{
if (d->loggingType != type) {
d->loggingType = type;
reopen();
}
}
/// Returns the types of messages to log.
///
QXmppLogger::MessageTypes QXmppLogger::messageTypes()
{
return d->messageTypes;
}
/// Sets the types of messages to log.
///
/// \param types
void QXmppLogger::setMessageTypes(QXmppLogger::MessageTypes types)
{
d->messageTypes = types;
}
/// Add a logging message.
///
/// \param type
/// \param text
void QXmppLogger::log(QXmppLogger::MessageType type, const QString& text)
{
// filter messages
if (!d->messageTypes.testFlag(type))
return;
switch(d->loggingType)
{
case QXmppLogger::FileLogging:
if (!d->logFile) {
d->logFile = new QFile(d->logFilePath);
d->logFile->open(QIODevice::WriteOnly | QIODevice::Append);
}
QTextStream(d->logFile) << formatted(type, text) << "\n";
break;
case QXmppLogger::StdoutLogging:
std::cout << qPrintable(formatted(type, text)) << std::endl;
break;
case QXmppLogger::SignalLogging:
emit message(type, text);
break;
default:
break;
}
}
/// Sets the given \a gauge to \a value.
///
/// NOTE: the base implementation does nothing.
void QXmppLogger::setGauge(const QString &gauge, double value)
{
Q_UNUSED(gauge);
Q_UNUSED(value);
}
/// Updates the given \a counter by \a amount.
///
/// NOTE: the base implementation does nothing.
void QXmppLogger::updateCounter(const QString &counter, qint64 amount)
{
Q_UNUSED(counter);
Q_UNUSED(amount);
}
/// Returns the path to which logging messages should be written.
///
/// \sa loggingType()
QString QXmppLogger::logFilePath()
{
return d->logFilePath;
}
/// Sets the path to which logging messages should be written.
///
/// \param path
///
/// \sa setLoggingType()
void QXmppLogger::setLogFilePath(const QString &path)
{
if (d->logFilePath != path) {
d->logFilePath = path;
reopen();
}
}
/// If logging to a file, causes the file to be re-opened.
///
void QXmppLogger::reopen()
{
if (d->logFile) {
delete d->logFile;
d->logFile = 0;
}
}