_log.h

http代理程序

/************************************
  REVISION LOG ENTRY
  Revision By: Alex Turc
  Revised on 6/5/00 12:03:17 PM
  Comments: Logging facilities
 ************************************/

#ifndef ___log_h__
#define ___log_h__


#include <fstream>
#include <string>
#include <ctime>
using namespace std;

#include <stdarg.h>

#include "_exception.h"

namespace extension
{

/////////////
// Exceptions
/////////////

class event_log_exception :
	public extended_exception
{
public:

	event_log_exception( long nCode, const char* pDescription = "Event log exception", const char* pFile = "", long nLine = -1 ) :
	  extended_exception( nCode, pDescription, pFile, nLine )
	{
	}
};

/*
May 29 2000
Used for event logging
*/
class event_log
{

public:

	// Event types
	typedef enum event_type
	{
		event_type_error,		
		event_type_warning,		
		event_type_information
	} event_type;


	event_log( char* szFile, bool bLogging = true )
	{
		m_strFileName = szFile;
		m_bLogging = bLogging;

		log_event( event_type_information, "Connection to log file established" );
	}

	virtual ~event_log()
	{
		log_event( event_type_information, "Connection to log file closed" );
	}


	void log_event( event_type evtType, const char* szFormat, ... )
	{
		if( !m_bLogging )
			return;

		static const iBufferSize = 1024 * 5;
		char pBuffer[iBufferSize];

		// Print the parameters into a memory buffer
		va_list arg_list;
		va_start( arg_list, szFormat );
		::vsprintf( pBuffer, szFormat, arg_list );
		va_end( arg_list );

		// Write data to the log file	
		fstream fsLog( m_strFileName.c_str(), ios_base::out | ios_base::app );
		time_t t = time( NULL );
		string strTime = ctime( &t );
		fsLog << endl << strTime.substr( 0, strTime.size() - 1 ) << "\t\t" << event_type_to_string( evtType ) << "\t" << pBuffer;	

		fsLog.close();
	}


	void enable_logging( bool bLogging )
	{
		m_bLogging = bLogging;
	}


private:

	// Flag used to enable or disable logging
	bool m_bLogging;
	// Name of the log file
	string m_strFileName;

	const char* event_type_to_string( event_type evtType )
	{
		static const char* events[] = 
		{
			"Error      ",		
			"Warning    ",
			"Information"
		};

		return events[evtType];
	}
};

} // Namespace alx

#endif // ___log_h__