examples/sfexamples/TextFile/src/TextFileAppUi.cpp

00001 /*
00002  * Copyright (c) 2002-2011 Nokia Corporation and/or its subsidiary(-ies). All rights reserved.
00003  *    
00004  * Redistribution and use in source and binary forms, with or without
00005  * modification, are permitted provided that the following conditions are met:
00006  *    
00007  *  * Redistributions of source code must retain the above copyright notice, this
00008  *    list of conditions and the following disclaimer.
00009  *  * Redistributions in binary form must reproduce the above copyright notice,
00010  *    this list of conditions and the following disclaimer in the documentation
00011  *    and/or other materials provided with the distribution.
00012  *  * Neither the name of Nokia Corporation nor the names of its contributors
00013  *    may be used to endorse or promote products derived from this software
00014  *    without specific prior written permission.
00015  *    
00016  *    THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
00017  *    AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
00018  *    IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
00019  *    DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
00020  *    FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
00021  *    DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
00022  *    SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
00023  *    CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
00024  *    OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
00025  *    OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
00026  *    
00027  *    Description:  
00028  */ 
00029 
00030 // INCLUDES
00031 #include <f32file.h>
00032 #include <TextFile.rsg>
00033 
00034 #include "TextFileAppUi.h"
00035 #include "TextFileMainView.h"
00036 #include "TextFile.hrh"
00037 
00038 // CONSTANTS
00039 const TInt KMaxBuffer = 256;
00040 _LIT(KSourceFileName, "c:\\data\\myfile.txt");
00041 
00042 const TChar KDelimiter = '\f';
00043 
00044 
00045 // MEMBER FUNCTIONS
00046 
00047 // --------------------------------------------------------------------------
00048 // Constructor
00049 // --------------------------------------------------------------------------
00050 void CTextFileAppUi::ConstructL()
00051         {
00052         BaseConstructL(EAknEnableSkin);
00053         
00054         iMainView = CTextFileMainView::NewL(ClientRect());
00055         }
00056         
00057 // --------------------------------------------------------------------------
00058 // Destructor
00059 // --------------------------------------------------------------------------
00060 CTextFileAppUi::~CTextFileAppUi()
00061     {
00062     if (iMainView)
00063         {
00064         delete iMainView;
00065         iMainView = NULL;
00066         }
00067     iBuffer.Close();
00068     }
00069 
00070 // --------------------------------------------------------------------------
00071 // Handles user command.
00072 // --------------------------------------------------------------------------
00073 void CTextFileAppUi::HandleCommandL(TInt aCommand)
00074         {
00075         switch ( aCommand )
00076                 {
00077                 // For S60, we need to handle this event, which is normally
00078                 // an event from the right soft key.
00079                 case EAknSoftkeyExit:
00080                 case EEikCmdExit:
00081                         {
00082                         Exit();
00083                         break;
00084                         }
00085                 
00086                 case ETextFileReadTextFile:
00087                         {
00088                         RFs& fileServer = iCoeEnv->FsSession();
00089                         
00090                         // Delete the old string first.
00091                         iBuffer.Close();
00092                         iBuffer.CreateL(KNullDesC, 0);
00093                         
00094                         // Read the string from the file.
00095                         ReadFromTextFileL(fileServer, KSourceFileName);
00096                         
00097                         // Set the text in the main view to the string.
00098                         iMainView->SetTextL(iBuffer);
00099                         
00100                         iEikonEnv->InfoWinL(
00101                                 R_TEXTFILE_CAPTION, R_TEXTFILE_FILEREAD);
00102                         break;
00103                         }
00104                 
00105                 default:
00106                         // Do nothing
00107                         break;
00108                 }
00109         }
00110 
00111 
00112 
00113 // --------------------------------------------------------------------------
00114 // Handles screen resolution/size changes.
00115 // --------------------------------------------------------------------------
00116 void CTextFileAppUi::HandleResourceChangeL(TInt aType)
00117         {
00118         CAknAppUi::HandleResourceChangeL(aType);
00119         iMainView->SetRect(ClientRect());
00120         }
00121 
00122 
00123 // --------------------------------------------------------------------------
00124 // Reads text file to an array.
00125 // --------------------------------------------------------------------------
00126 void CTextFileAppUi::ReadFromTextFileL(RFs& aFs, const TDesC& aFileName)
00127         {
00128         // Open the file for reading.
00129         RFile file;
00130         User::LeaveIfError(file.Open(aFs, aFileName, EFileRead | EFileStreamText));
00131         CleanupClosePushL(file);
00132         
00133         // Create a new instance of TFileText that point to file variable.
00134         TFileText fileText;
00135         fileText.Set(file);
00136         
00137         // Create a buffer to read the text file.
00138         TBuf<KMaxBuffer> buffer;
00139         
00140         // Loop to read the buffer. It read the buffer until err is KErrEof,
00141         // which means it reached end of file.
00142         TInt err = KErrNone;
00143         while (err != KErrEof)
00144                 {
00145                 err = fileText.Read(buffer);
00146                 
00147                 // If the error code is other than KErrNone or KErrEof,
00148                 // leave this function.
00149                 if ((err != KErrNone) && (err != KErrEof))
00150                         {
00151                         User::Leave(err);
00152                         }
00153 
00154                 if (KErrNone == err)
00155                         {
00156                         // Do something with the buffer.
00157                         // In this example, we append the buffer to an array.
00158                         iBuffer.ReAllocL(iBuffer.Length() + buffer.Length() + 1);
00159                         iBuffer.Append(buffer);
00160                         iBuffer.Append(KDelimiter);
00161                         }
00162                 }
00163         
00164         CleanupStack::PopAndDestroy(&file);
00165         }
00166 
00167 // End of File

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