CallbackFunction
(function) The name of a function that will be called whenever progress is made in adding a file to the Zip archive. (You can use this callback function to display the progress of each file's archiving in your own custom way.)
Note: If CallbackFunction is set to nil, then the progress information will be sent to the built-in status dialog, assuming it is currently visible. (You can show or hide the status dialog with a StatusDlg.Show or StatusDlg.Hide action.)
The callback function must be able to receive the following parameters: