examples/SFExamples/Files/TextFile/src/TextFileAppUi.cpp

/*
 * Copyright (c) 2002-2011 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
 *    
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *    
 *  * Redistributions of source code must retain the above copyright notice, this
 *    list of conditions and the following disclaimer.
 *  * Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 *  * Neither the name of Nokia Corporation nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *    
 *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 *    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 *    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
 *    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 *    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 *    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 *    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 *    OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 *    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *    
 *    Description:  
 */ 

// INCLUDES
#include <f32file.h>
#include <TextFile.rsg>

#include "TextFileAppUi.h"
#include "TextFileMainView.h"
#include "TextFile.hrh"

// CONSTANTS
const TInt KMaxBuffer = 256;
_LIT(KSourceFileName, "c:\\data\\myfile.txt");

const TChar KDelimiter = '\f';


// MEMBER FUNCTIONS

// --------------------------------------------------------------------------
// Constructor
// --------------------------------------------------------------------------
void CTextFileAppUi::ConstructL()
        {
        BaseConstructL(EAknEnableSkin);
        
        iMainView = CTextFileMainView::NewL(ClientRect());
        }
        
// --------------------------------------------------------------------------
// Destructor
// --------------------------------------------------------------------------
CTextFileAppUi::~CTextFileAppUi()
    {
    if (iMainView)
        {
        delete iMainView;
        iMainView = NULL;
        }
    iBuffer.Close();
    }

// --------------------------------------------------------------------------
// Handles user command.
// --------------------------------------------------------------------------
void CTextFileAppUi::HandleCommandL(TInt aCommand)
        {
        switch ( aCommand )
                {
                // For S60, we need to handle this event, which is normally
                // an event from the right soft key.
                case EAknSoftkeyExit:
                case EEikCmdExit:
                        {
                        Exit();
                        break;
                        }
                
                case ETextFileReadTextFile:
                        {
                        RFs& fileServer = iCoeEnv->FsSession();
                        
                        // Delete the old string first.
                        iBuffer.Close();
                        iBuffer.CreateL(KNullDesC, 0);
                        
                        // Read the string from the file.
                        ReadFromTextFileL(fileServer, KSourceFileName);
                        
                        // Set the text in the main view to the string.
                        iMainView->SetTextL(iBuffer);
                        
                        iEikonEnv->InfoWinL(
                                R_TEXTFILE_CAPTION, R_TEXTFILE_FILEREAD);
                        break;
                        }
                
                default:
                        // Do nothing
                        break;
                }
        }



// --------------------------------------------------------------------------
// Handles screen resolution/size changes.
// --------------------------------------------------------------------------
void CTextFileAppUi::HandleResourceChangeL(TInt aType)
        {
        CAknAppUi::HandleResourceChangeL(aType);
        iMainView->SetRect(ClientRect());
        }


// --------------------------------------------------------------------------
// Reads text file to an array.
// --------------------------------------------------------------------------
void CTextFileAppUi::ReadFromTextFileL(RFs& aFs, const TDesC& aFileName)
        {
        // Open the file for reading.
        RFile file;
        User::LeaveIfError(file.Open(aFs, aFileName, EFileRead | EFileStreamText));
        CleanupClosePushL(file);
        
        // Create a new instance of TFileText that point to file variable.
        TFileText fileText;
        fileText.Set(file);
        
        // Create a buffer to read the text file.
        TBuf<KMaxBuffer> buffer;
        
        // Loop to read the buffer. It read the buffer until err is KErrEof,
        // which means it reached end of file.
        TInt err = KErrNone;
        while (err != KErrEof)
                {
                err = fileText.Read(buffer);
                
                // If the error code is other than KErrNone or KErrEof,
                // leave this function.
                if ((err != KErrNone) && (err != KErrEof))
                        {
                        User::Leave(err);
                        }

                if (KErrNone == err)
                        {
                        // Do something with the buffer.
                        // In this example, we append the buffer to an array.
                        iBuffer.ReAllocL(iBuffer.Length() + buffer.Length() + 1);
                        iBuffer.Append(buffer);
                        iBuffer.Append(KDelimiter);
                        }
                }
        
        CleanupStack::PopAndDestroy(&file);
        }

// End of File

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