examples/sfexamples/BinaryFile/src/BinaryFileAppUi.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 <bautils.h>
#include <BinaryFile.rsg>

#include "BinaryFileAppUi.h"
#include "BinaryFileMainView.h"
#include "BinaryFile.hrh"

// CONSTANTS
const TInt KMaxBuffer = 512;
_LIT(KNewFileName,    "c:\\data\\newfile.dat");
_LIT(KSourceFileName, "c:\\data\\sourcefile.dat");
_LIT(KDestFileName,   "c:\\data\\destfile.dat");

// MEMBER FUNCTIONS

// --------------------------------------------------------------------------
// Constructor
// --------------------------------------------------------------------------
void CBinaryFileAppUi::ConstructL()
        {
        BaseConstructL(EAknEnableSkin); 
        iMainView = CBinaryFileMainView::NewL(ClientRect());
        BaflUtils::EnsurePathExistsL(iCoeEnv->FsSession(), KNewFileName);
        }
        
// --------------------------------------------------------------------------
// Destructor
// --------------------------------------------------------------------------
CBinaryFileAppUi::~CBinaryFileAppUi()
    {
    if (iMainView)
        {
        delete iMainView;
        iMainView = NULL;
        }
    }

// --------------------------------------------------------------------------
// Handles user command.
// --------------------------------------------------------------------------
void CBinaryFileAppUi::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 EBinaryFileWriteToFile:
                        {
                        RFs& fileServer = iCoeEnv->FsSession();
                        
                        // Create a buffer to be written to the file.                           
                        RBuf8 buffer;
                        User::LeaveIfError(buffer.CreateMax(KMaxBuffer));
                        CleanupClosePushL(buffer);
                                
                        // Fill the buffer with your data.
                        // …
                        for (TInt i = 0; i < KMaxBuffer; i++)
                                {
                                buffer[i] = i;
                                }

                        // Write buffer to the file.
                        WriteDescToFileL(fileServer, KNewFileName, buffer);

                        // Delete the buffer.
                        CleanupStack::PopAndDestroy(&buffer);
                        
                        iEikonEnv->InfoWinL(
                                        R_BINARYFILE_CAPTION, R_BINARYFILE_FILEWRITTEN);
                        break;
                        }
                        
                case EBinaryFileReadFromFile:
                        {
                        RFs& fileServer = iCoeEnv->FsSession();
                        
                        // Create a new buffer
                        RBuf8 buffer;
                        User::LeaveIfError(buffer.CreateMax(KMaxBuffer));
                        CleanupClosePushL(buffer);
                        
                        // Read from the file.
                        // We have to make sure that the buffer has enough space,
                        // otherwise it will panic.
                        ReadDescFromFileL(fileServer, KSourceFileName, buffer);
                        
                        // Write the buffer to a file.
                        WriteDescToFileL(fileServer, KDestFileName, buffer);
                        
                        // Delete the buffer.
                        CleanupStack::PopAndDestroy(&buffer);
                        
                        iEikonEnv->InfoWinL(R_BINARYFILE_CAPTION, R_BINARYFILE_FILEREAD);
                        break;
                        }
                
                default:
                        // Do nothing
                        break;
                }
        }

        


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



// --------------------------------------------------------------------------
// Writes descriptor to a file.
// --------------------------------------------------------------------------
void CBinaryFileAppUi::WriteDescToFileL(RFs& aFs, const TDesC& aFileName,
                const TDesC8& aBuffer)
        {
        RFile file;
        User::LeaveIfError(file.Replace(aFs, aFileName, EFileWrite));
        CleanupClosePushL(file);
        
        User::LeaveIfError(file.Write(aBuffer, aBuffer.Length()));
        
        CleanupStack::PopAndDestroy(&file);
        }

// --------------------------------------------------------------------------
// Reads descriptor from a file.
// Note that the descriptor must have sufficient length; otherwise it
// will leave.
// --------------------------------------------------------------------------
void CBinaryFileAppUi::ReadDescFromFileL(RFs& aFs, const TDesC& aFileName,
                TDes8& aBuffer)
        {
        RFile file;
        User::LeaveIfError(file.Open(aFs, aFileName, EFileRead));
        CleanupClosePushL(file);
        
        // Get the file size.
        TInt fileSize;
        User::LeaveIfError(file.Size(fileSize));
        
        // If the maximum length of the buffer is less than the file size,
        // it means we don't have enough space.
        if (aBuffer.MaxLength() < fileSize)
                {
                User::Leave(KErrOverflow);
                }
        User::LeaveIfError(file.Read(aBuffer, fileSize));
        
        CleanupStack::PopAndDestroy(&file); // file
        }

// End of File

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