iapconnectdemosocketswriter.cpp

symbian关于Internet访问的代码

/*
* ============================================================================
*  Name     : CIAPConnectDemoSocketsWriter from IAPConnectDemoSocketsWriter.cpp
*  Part of  : Internet Access Points Example v2.0
*  Created  : 01.09.2006 by Forum Nokia
*  Version  : 2.0
*  Copyright: Forum Nokia
* ============================================================================
*/

// INCLUDE FILES
#include "IAPConnectDemoSocketsWriter.h"
#include "IAPConnectDemoSocketsObserver.h"

const TInt KWriteBufferSize = 20;

// ========================= MEMBER FUNCTIONS ================================

// Constructor
CIAPConnectDemoSocketsWriter::CIAPConnectDemoSocketsWriter( 
    MIAPConnectDemoSocketsObserver& aSocketsObserver,
    RSocket& aSocket )
: CActive( EPriorityStandard ),
  iSocket( aSocket ),
  iSocketsObserver( aSocketsObserver )
    {
    // No implementation required
    }
    
// Destructor.
CIAPConnectDemoSocketsWriter::~CIAPConnectDemoSocketsWriter()
    {
    Cancel();
    }    
    
// ---------------------------------------------------------------------------
// CIAPConnectDemoSocketsWriter::NewL()
// Two-phased constructor.
// ---------------------------------------------------------------------------
//
CIAPConnectDemoSocketsWriter* CIAPConnectDemoSocketsWriter::NewL( 
    MIAPConnectDemoSocketsObserver& aSocketsObserver,
    RSocket& aSocket )
    {
    CIAPConnectDemoSocketsWriter* self = 
        CIAPConnectDemoSocketsWriter::NewLC( aSocketsObserver, aSocket );
    CleanupStack::Pop( self );
    return self;
    }

// ---------------------------------------------------------------------------
// CIAPConnectDemoSocketsWriter::NewLC()
// Two-phased constructor.
// ---------------------------------------------------------------------------
//
CIAPConnectDemoSocketsWriter* CIAPConnectDemoSocketsWriter::NewLC( 
    MIAPConnectDemoSocketsObserver& aSocketsObserver,
    RSocket& aSocket )
    {
    CIAPConnectDemoSocketsWriter* self = 
        new ( ELeave ) CIAPConnectDemoSocketsWriter(aSocketsObserver, aSocket);
    CleanupStack::PushL( self );
    self->ConstructL();
    return self;
    }


// ---------------------------------------------------------------------------
// CIAPConnectDemoSocketsWriter::ConstructL()
// Symbian 2nd phase constructor can leave.
// ---------------------------------------------------------------------------
//
void CIAPConnectDemoSocketsWriter::ConstructL()
    {
    CActiveScheduler::Add( this );
    iWriteStatus = EWaiting;
    }

// ---------------------------------------------------------------------------
// CIAPConnectDemoSocketsWriter::DoCancel()
// Cancels any outstanding operation.
// ---------------------------------------------------------------------------
//
void CIAPConnectDemoSocketsWriter::DoCancel()
    {
    // Cancel asychronous write request
    iSocket.CancelWrite();
    iWriteStatus = EWaiting;
    }

// ---------------------------------------------------------------------------
// CIAPConnectDemoSocketsWriter::RunL()
// Called when operation completes.
// ---------------------------------------------------------------------------
//
void CIAPConnectDemoSocketsWriter::RunL()
    {
    // Active object request complete handler
    if ( iStatus == KErrNone )
        {
        switch( iWriteStatus )
            {
            // Character has been written to socket
            case ESending:
                SendNextPacket();
                break;
            default:
                break;
            };
        }
    else
        {
        // Error: pass it up to user interface
        iSocketsObserver.ReportErrorL( 
            MIAPConnectDemoSocketsObserver::EGeneralWriteError,
            iStatus.Int() );
        iWriteStatus = EWaiting;
        }
    }

// ---------------------------------------------------------------------------
// CIAPConnectDemoSocketsWriter::IssueWriteL()
// Writes the data to the socket ( buffered ).
// ---------------------------------------------------------------------------
//
void CIAPConnectDemoSocketsWriter::IssueWriteL( const TDesC8& aData )
    {
    if ( ( iWriteStatus != EWaiting ) && ( iWriteStatus != ESending ) )
        { 
        User::Leave( KErrNotReady );
        }

    if ( ( aData.Length() + iTransferBuffer.Length() ) >
         iTransferBuffer.MaxLength() )
        {
        // Not enough space in buffer
        User::Leave( KErrOverflow );
        }

    // Add new data to buffer
    iTransferBuffer.Append( aData );

    if ( !IsActive() )
        {
        SendNextPacket();
        }
    }

// ---------------------------------------------------------------------------
// CIAPConnectDemoSocketsWriter::SendNextPacket()
// Handles a 'write buffer empty' situation.
// ---------------------------------------------------------------------------
//
void CIAPConnectDemoSocketsWriter::SendNextPacket()
    {
    if ( iTransferBuffer.Length() > 0 )
        {
        // Move data from transfer buffer to actual write buffer
        iWriteBuffer = iTransferBuffer;
        iTransferBuffer.Zero();
        iSocket.Write( iWriteBuffer, iStatus ); // Initiate actual write

        iWriteStatus = ESending;
        SetActive();
        }
    else
        {
        iWriteStatus = EWaiting;
        }
    }

// End of File