Cancel CAknWaitDialog, I always get "Application is busy"

[charles_happysunny]

Hello everyone,

I developped an application for doing Http transaction. I use CAknWaitDialog to indicate the process status. When I tried to cancel the http transaction, the connection could be closed successfully. But the dialog could not be dismissed. The text in the dialog turns to "Application is busy". And I can do nothing to dismiss the dialog any more.

Here is my source code:

//Constructor, Defines priority for this Active object
CTelObserver::CTelObserver(CHttpCommunication* aServerComm) : iServerComm(aServerComm)
	{
	}

// Two phase construction
CTelObserver* CTelObserver::NewL(CHttpCommunication* aServerComm)
	{
	CTelObserver* self = CTelObserver::NewLC(aServerComm);
	CleanupStack::Pop(self);
	return self;
	}

CTelObserver* CTelObserver::NewLC(CHttpCommunication* aServerComm)
	{
	CTelObserver* self = new (ELeave) CTelObserver(aServerComm);
	CleanupStack::PushL(self);
	self->ConstructL();
	return self;
	}

void CTelObserver::ConstructL()
	{
	}

// Destructor
CTelObserver::~CTelObserver()
	{
	}

// Start show waiting dialog
void CTelObserver::StartWaiting()
	{
	if (iWaitNote)
		{
		delete iWaitNote;
		iWaitNote = NULL;
		}

	CAknWaitDialog* aWaitNote = new (ELeave) CAknWaitDialog(
			reinterpret_cast<CEikDialog**> (&iWaitNote), ETrue);
	CleanupStack::PushL(aWaitNote);
	aWaitNote->SetCallback(this);
	aWaitNote->PrepareLC(R_HTTP_REQUEST_WAIT_NOTE);
	CleanupStack::Pop(aWaitNote);
	iWaitNote = aWaitNote;
	iWaitNote->RunLD();
	}

// Change the text in dialog
void CTelObserver::ChangeWaitNoteTextL(const TDesC& aDesC)
	{
	iWaitNote->SetTextL(aDesC);
	}

// To dismiss wait note
void CTelObserver::DismissWaitNote()
	{
	iWaitNote->ProcessFinishedL();
	iWaitNote = NULL;
	}

// From MProgressDialogCallback
void CTelObserver::DialogDismissedL(TInt aButtonId)
	{
	iServerComm->Cancel();
	iServerComm->CloseConnection();
	}

Here is the resource code for dialog:

RESOURCE DIALOG r_http_request_wait_note
	{
	flags = EAknWaitNoteFlags | EEikDialogFlagWait |EEikDialogFlagNotifyEsc;
	buttons=R_AVKON_SOFTKEYS_CANCEL;
	items =
		{
		DLG_LINE
			{
			type = EAknCtNote;
			id = ECidWaitNote;
			control = AVKON_NOTE
				{
				layout = EWaitLayout;
				singular_label = "Opening Connection..";
				animation = R_QGN_GRAF_WAIT_BAR_ANIM;
				};
			}
		};
	}

Anyone has suggestions? I am really stuck.