Getting the page size and knowing how many pages they are in PDF file

Hi There,
when i do this script (
var myPDFFile = File.openDialog(["Choose a PDF File"]); )
with JS via Windows it is used for opening a new PDF file when i import this file i need to
get the page size and how many pages they are in PDF file. but i dont know how to do it.
please help me.

Ask here: http://forums.adobe.com/community/indesign/indesign_scripting

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Getting the page size and knowing how many pages they are in PDF file

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