st_logger.cpp

#include "st_logger.h"
#include <QTextStream>
namespace STMsgLogger{
	st_logger::st_logger(QObject *parent) :
		QObject(parent)
	{
		m_pLogFile = 0;
		m_bUseLogFile = true;
		m_nLogLevel = 2;
		m_nMaxFileSize = 256*1024*1024;
	}
	void st_logger::setMaxFileSize(int nSize)
	{
		if (nSize >=1024*1024 && nSize <=1024*1024*1024)
			m_nMaxFileSize = nSize;
	}
	int st_logger::maxFileSize() const
	{
		return m_nMaxFileSize;
	}
	int st_logger::logLevel() const
	{
		return m_nLogLevel;
	}
	void st_logger::setLogLevel(int lv)
	{
		if (lv >=0 && lv <=3)
			m_nLogLevel = lv;
	}

	bool st_logger::CreateNewLogFile(QCoreApplication * app)
	{
		bool res = false;
		QDateTime dtmCur = QDateTime::currentDateTime();
		m_currLogFileName = app->applicationDirPath() + "/Log/" + dtmCur.toString("yyyy_MM") + "/";
		QDir dir;
		dir.mkpath(m_currLogFileName);
		m_currLogFileName += dtmCur.toString("yyyy_MM_dd_HH_mm_ss_");
		m_currLogFileName += app->applicationName() + QString("(%1).txt").arg(app->applicationPid());
		if (m_pLogFile)
		{
			if (m_pLogFile->isOpen()==true)
				m_pLogFile->close();
			m_pLogFile->deleteLater();
			m_pLogFile = 0;
		}
		m_pLogFile = new QFile (m_currLogFileName,this);
		if (m_pLogFile)
		{
			if (m_pLogFile->open(QIODevice::WriteOnly)==false)
			{
				m_pLogFile->deleteLater();
				m_pLogFile = 0;
			}
			else
				res = true;
		}
		return res;
	}
	void st_logger::MessageOutput(QtMsgType type, const QMessageLogContext &context, const QString &msg)
	{
		m_mutextLogger.lock();
		switch (type) {
		case QtDebugMsg:
			if (m_nLogLevel < 3)
			{
				m_mutextLogger.unlock();
				return;
			}
			break;
		case QtWarningMsg:
			if (m_nLogLevel < 2)
			{
				m_mutextLogger.unlock();
				return;
			}
			break;
		case QtCriticalMsg:
			if (m_nLogLevel < 1)
			{
				m_mutextLogger.unlock();
				return;
			}
			break;
		case QtFatalMsg:
			if (m_nLogLevel < 0)
			{
				m_mutextLogger.unlock();
				return;
			}
			break;
		default:
			if (m_nLogLevel < 3)
			{
				m_mutextLogger.unlock();
				return;
			}
			break;
		}
		if (m_pLogFile==0)
		{
			if (m_bUseLogFile==true)
				m_bUseLogFile = CreateNewLogFile(QCoreApplication::instance());
			if (m_pLogFile==0)
			{
				m_mutextLogger.unlock();
				return;
			}
		}

		QDateTime dtmCur = QDateTime::currentDateTime().toUTC();

		QString strMsg ;
		strMsg += dtmCur.toString("yyyy-MM-dd HH:mm:ss.zzz");
		QString strMsgHeader = dtmCur.toString("\n                       ");
		strMsg += "(UTC)>";
		strMsgHeader += "      ";
		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;
		default:
			strMsg += QString("Unknown :");
			break;
		}
		strMsg.append(msg);
		strMsgHeader += QString("         From {%1:%2,%3}\n").arg(QString(context.file)).arg(context.line).arg(QString(context.function));
		strMsg.append(strMsgHeader);

		QTextStream stream(m_pLogFile);
		stream << strMsg;
		stream.flush();
		if (m_pLogFile->pos()>=m_nMaxFileSize)
			m_bUseLogFile = CreateNewLogFile(QCoreApplication::instance());
		m_mutextLogger.unlock();
	}

}