From Forum Nokia Wiki

The following article describes how to use a CAknWaitDialog without using callbacks. It shows how to create the wait dialog , how to handle the cancel button and how to do away with the dialog when the process has finished.

Header File (.h)

Declare CAknWaitDialog* iWaitDialog; in your class. There's no need to derive the class from MProgressDialogCallback.

Code (.cpp)

• Creation and handling Cancel

iWaitDialog = new(ELeave)CAknWaitDialog( (REINTERPRET_CAST(CEikDialog**,&iWaitDialog)));//create instance
 
iWaitDialog->PrepareLC(R_MYWAITDIALOG);
iWaitDialog->SetTextL(_L("Connecting..."));
if(iWaitDialog->RunLD()==0)
{
    //Cancel has been pressed iWaitDialog will be destroyed because of LD
}
/*
NOTE: If the dialog is used as a modal, only then RunLD returns 0 when the
dialog is dismissed and if the dialog is not used as a modal then it returns
EAknSoftkeyDone.
*/

• Dismiss wait dialog (on the event that the process has finished)

void CMyClass::MyProcessIsOver()
{
    if(iWaitDialog)
    iWaitDialog->ProcessFinishedL();
}