>When run a report ie.
> Report Form Myreport.frx To Printer Prompt Noconsole
>
>How to know if the user press the Cancel button when VFP prompts for Printer and the report is cancelled

You can use:

lcPrinter = GetPrinter()
if empty( lcPrinter )
   * User cancelled
else
   Report Form Myreport.frx To Printer Name ( lcPrinter ) Noconsole
endif

Please check the syntax. I wrote it just here, but you get the idea.

Hope this helps.