a bus upper filter must attach to pdo and pdo which both created by the bus driver?

Discussion in 'Windows Vista Drivers' started by Unicoco, Dec 29, 2008.

  1. Unicoco

    Unicoco Guest


    I write a filter base on tosterfilter. I would like attach the fido to a bus
    driver. And the bus driver create a pdo and a fdo. Should I attach my fido
    to the both?

    sorry for my bad English .
    Any input will be appreciated.
    Unicoco, Dec 29, 2008
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  2. Unicoco

    Tim Roberts Guest

    A filter driver attaches either above the FDO (an "upper filter") or
    between the PDO and FDO (a "lower filter"). The one you need depends on
    what your filter is supposed to do.


    Bus filters can be tricky. Can you describe what you hope to do in more
    Tim Roberts, Dec 31, 2008
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  3. Unicoco

    leafbanana Guest

    Typically, a lower filter driver is between the function driver and
    the bus driver, and the FiDO that a lower filter driver creates is
    between FDO(created by the function driver) and PDO(created by bus

    If the bus driver creates more than one device objects, the FiDO is
    supposed to be attached on the top one. However, there is no need to
    care about this. Because your lower filter driver is loaded right
    after the bus driver, thus the device object it creates shoud be at
    the correct position.
    leafbanana, Jan 5, 2009
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