Archived:Monitoring MMC insertion/removal events using Symbian C++

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Article Metadata

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Tested with

Devices(s): All (S60)

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Compatibility

Platform(s): S60 3rd Edition,
S60 3rd Edition, FP1
S60 3rd Edition, FP2
S60 5th Edition

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Article

Keywords: NotifyChange, ENotifyDisk

Created: User:Technical writer 1 (December 17, 2007
last updated: December 14, 2009)

Last edited: hamishwillee (20 Aug 2012)

Overview

Applications can be notified about the insertion or removal of the MMC using the RFs::NotifyChange() function, with ENotifyDisk used as the notify type (first parameter).

Solution

In order to receive these events, the UI application should be made a system application to prevent it from being automatically closed when removing a memory card.

 CEikonEnv::Static()->SetSystem( ETrue );

After this, notification requests for memory card insertion or removal can be implemented using the following active object (a class derived from CActive):

  #include <f32file.h>
 
  class CMMCNotifier : public CActive
   {
  public: // Constructors and destructor
    static CMMCNotifier * NewL();
    ~CMMCNotifier ();
  public:
    CMMCNotifier ();
    void ConstructL();
 
  public:
    void RunL();
    void DoCancel();  
    void IssueRequest();
 
  private:
    RFs iFs;
  };

Implementation of notifier class

  CMMCNotifier::CMMCNotifier()
  : CActive( CActive::EPriorityStandard )
    {
    CActiveScheduler::Add( this );
    }
 
 
  CMMCNotifier::~CMMCNotifier()
    {
    Cancel();
    iFs.Close();
    }
 
 
  CMMCNotifier* CMMCNotifier::NewL()
    {
    CMMCNotifier* self = new (ELeave) CMMCNotifier;
    CleanupStack::PushL(self);
    self->ConstructL();
    CleanupStack::Pop(self);
    return self;
    }
 
 
  void CMMCNotifier::IssueRequest()
    {
    if ( !IsActive() ) 
      {
      // Request to get notified of MMC insertion/removal events
      iFs.NotifyChange( ENotifyDisk, iStatus );
      SetActive();
      }
    }
 
  void CMMCNotifier::ConstructL()
    {
    User::LeaveIfError( iFs.Connect() );
    }
 
 
  void CMMCNotifier::DoCancel()
   {
   iFs.NotifyChangeCancel();
   }
 
 
  void CMMCNotifier::RunL()
    {
    TDriveInfo driveInfo;  
    // Get the drive info for memory card 
    TInt err = iFs.Drive( driveInfo, EDriveE );
    if( err == KErrNone )
      {
      switch( driveInfo.iType )
        {
        case EMediaNotPresent:
          {
          //MMC removed          
          break;
          }
        default:
          {
          //MMC inserted          
          break;
          }
        }
      }
    // Issue request for next event notification
    IssueRequest();
    }