Why can´t I use inport VI in win xp even when I have used userport aplication?

why can´t I use inport VI in win xp even when I have used userport aplication for enabling port reading in this plattform?, I´m getting data from the parallel port in epp mode, my pc´s pararell is ok bcs I can read data in c++

If you have an older LabVIEW (6.1 or earlier) you will need to exchange the in port and out port VIs that came with LabVIEW with different ones and install a DLL. The reason is documented here . This link (which is the first link returned when you search ni.com for "in port") explains basically that the OS won't let you until you have kernel level access. The devzone link at the bottom of the refered page will include all of the code that you need to install (VIs and DLL) to make it work.
>
Bob Young - Test Engineer - Lapsed Certified LabVIEW Developer
DISTek Integration, Inc. - NI Alliance Member
mailto:[email protected]

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