Rails - May 2009 - request.raw_post into Tempfile

i have flash application ,which will give a jpg file as raw_post

from that raw_post i am trying to store into a tempfile

tempfile=Tempfile.new("myfile.jpg")
tempfile.write(request.raw_post)

but always "tempfile.read" giving ""(not storing the data)
as output

i don''t why ?

any help ?
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