os/mm/mmtestenv/mmtestfw/Source/TestFrameworkServer/LogFile.cpp
author sl@SLION-WIN7.fritz.box
Fri, 15 Jun 2012 03:10:57 +0200
changeset 0 bde4ae8d615e
permissions -rw-r--r--
First public contribution.
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// Copyright (c) 2002-2009 Nokia Corporation and/or its subsidiary(-ies).
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// All rights reserved.
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// This component and the accompanying materials are made available
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// under the terms of "Eclipse Public License v1.0"
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// which accompanies this distribution, and is available
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// at the URL "http://www.eclipse.org/legal/epl-v10.html".
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//
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// Initial Contributors:
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// Nokia Corporation - initial contribution.
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//
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// Contributors:
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//
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// Description:
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//
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// EPOC includes
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#include <e32base.h>
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// Test system includes
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#include "LogFile.h"
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/*
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 * destructor for CFileLogger.
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 */
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CFileLogger::~CFileLogger()
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	{
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	// make sure session to file server is closed
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	Close();
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	}
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/**
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 *
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 * Static constructor for CFileLogger.
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 *
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 * @return	"CFileLogger*"
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 *			The constructed CFileLogger
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 *
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 * @xxxx 
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 *
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 */
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CFileLogger* CFileLogger::NewL()
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	{
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	CFileLogger* s = new(ELeave) CFileLogger;
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	return s;
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	}
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/**
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 *
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 * Create and open a log file. The file is shareable, and a mutex
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 * and file seeks employed in case more than one session is using 
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 * the file.
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 *
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 * @param	"const TDesC& aDir"
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 *          The file path of the logfile to be created. If the path
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 *			does not exist, the logfile will not be created.
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 *
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 * @param   "const TDesC& aName"
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 *          The file name of same.
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 * 
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 * @xxxx
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 *
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 */
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void CFileLogger::CreateLog(const TDesC& aDir, const TDesC& aName)
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	{
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	// if aDir or aName are empty, then panic
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	__ASSERT_ALWAYS(aDir.Ptr() != NULL, User::Panic(_L("CFileLogger"), 0));
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	__ASSERT_ALWAYS(aName.Ptr() != NULL, User::Panic(_L("CFileLogger"), 1));
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	// if aDir doesn't exist, create it anyway
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	TUint aAttValue;
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	if (iFs.Att(aDir, aAttValue) != KErrNone) 
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		{
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		TInt returnCode = iFs.MkDirAll(aDir);
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		if (returnCode != KErrNone)
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			{
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			iEnabled = EFalse;
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			User::Panic(_L("CFileLogger"), 2);
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			}
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		}
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	iEnabled = ETrue;
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	iLogName = aName;
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	// create logfile mutex
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	RMutex logMutex;
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	logMutex.CreateGlobal(iLogName);
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	// make the correct file name
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	TFileName logFile;
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	logFile.Format(_L("%S%S"), &aDir, &aName);	// aDir will be \\-terminated
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	// If the file does not exist, create it. If it does, truncate it
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	// Open it for sharing
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	TInt returnCode=iLogfile.Replace(iFs, logFile, EFileWrite | EFileStreamText | EFileShareAny); 
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	// check if open fails 
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	if (returnCode==KErrNone)
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		{
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		//file has opened ok
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		//add the start to the HTML
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		iLogfile.Write(_L8("<html><body><pre>\n"));
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		TInt dummy;
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		iLogfile.Seek(ESeekEnd, dummy);
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		}
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	else
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		iEnabled = EFalse;
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	}
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/**
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 *
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 * Close the logfile. The flag iEnabled will be clear if there
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 * is no logfile to close.
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 * 
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 * @xxxx
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 *
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 */
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void CFileLogger::CloseLog()
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	{
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	// this should be mutex-safe as each thread has its own handle to 
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	// the log file
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	// if logging enabled, flush buffers
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	if (iEnabled)
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		{
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		iLogfile.Flush();
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		iLogfile.Close();
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		iEnabled = EFalse;
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		}
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	// disconnect from the file server
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	iFs.Close();
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	}
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/**
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 *
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 * Write output to the logfile.
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 *
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 * @param	"const TDesC& aMsg"
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 *          The message (string) to be written.
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 * 
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 * @xxxx
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 *
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 */
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void CFileLogger::WriteLog(const TDesC& aMsg)
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	{
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	if (!iEnabled) 
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		return;
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	// convert from unicode to 8 bit
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	TBuf8<KMaxLogLineLength> lineBuf8;
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	const TText* msgBuf = aMsg.Ptr();
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	for (TInt i = 0; i < aMsg.Length() ;i++)
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		lineBuf8.Append(STATIC_CAST(TText, msgBuf[i]));
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	// wait on mutex
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	RMutex logMutex;
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   	logMutex.OpenGlobal(iLogName);
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	logMutex.Wait();
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	// write to log file
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	TInt dummy=0;
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	iLogfile.Seek(ESeekEnd, dummy);
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	iLogfile.Write(lineBuf8);
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	// seek to end after write - in case another process or thread is also using the file
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	dummy=0; //dummy is updated after a seek to contain the new file position. With ESeekEnd
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	         //it is used as an offest value to control the seek.
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	iLogfile.Seek(ESeekEnd, dummy);
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	logMutex.Signal();
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	logMutex.Close();
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	}
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/**
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 *
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 * Connect to the file server. Used as a helper function
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 * by classes owning a CFileLogger, to ensure that a
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 * file server session can be opened
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 *
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 * @return	"TInt"
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 *			standard EPOC error code
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 * 
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 * @xxxx
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 *
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 */
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TInt CFileLogger::Connect()
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	{
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	TInt err = iFs.Connect();
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	if (err == KErrNone)
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		iFsOpen = ETrue;
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	return err;
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	}
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/**
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 *
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 * Close a file server session. Used as a helper function
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 * by classes owning a CFileLogger.
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 *
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 * @xxxx
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 *
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 */
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void CFileLogger::Close()
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	{
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	if (iFsOpen)
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		{
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		iFs.Close();
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		iFsOpen = EFalse;
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		}
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	}