This progressDilog box allow us to know How much system or the operation is completed using this progress bar you can sow penlty of things. To know more about progress bar go hear
http://wiki.forum.nokia.com/index.php/How_to_use_QProgressBar
The QProgressDialog class provides feedback on the progress of a slow operation. A progress dialog is used to give the user an indication of how long an operation is going to take, and to demonstrate that the application has not frozen. Although QProgressDialog is similar to QProgressBar, it give the user an opportunity to abort the operation, while QProgressBar will just show progress.
Article shows how to use progress bar in application very easily. Article shows capital function to handle the progressdialog is a very good approch. This code may place at the starting of many applications like browser, chat messenger etc. Article named with “How_to_use_QProgressBar_in_Qt_for_Symbian” is also the 70% same thing.
[--Fasttrack 06:08, 22 September 2009 (UTC)]