printer filter driver

hi all,
u r giving print command to take the printout.
what my task is it should not get printed insteadof that i have to store
the file contents to one file.we are having EPBA box.we have added one
circuit to trace the outgoing calls and the numbers will get
printed.instead of that one i have to store the numbers in one file.
i have written a driver that will capture the user buffer and it will store
the contents to one file using zwcreatfile and zwwritefile.
what my doubt is whether i have to write a filter driver for parallel port
or printer.
this is for win2k.printer is not having .sys file also.we cannot write a
filter driver for printer.then how can i achieve my task

can anyone else help me
thanks for ur answers.

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