mmioInstallIOProc - Parameters

fccIOProc (FOURCC) - input

The four-character code of the I/O procedure to install, remove, or search for.

pIOProc (PMMIOPROC) - input

If this function is being called to install an I/O procedure, then pIOProc must contain the address of the I/O procedure entry point. Otherwise, pIOProc must be NULL.

ulFlags (ULONG) - input

Only one of the following flags can be set:

MMIO_INSTALLPROC

Installs an I/O procedure with the entry point specified in the pIOProc parameter and the FOURCC in the fccIOProc parameter.
MMIO_REMOVEPROC
Removes an I/O procedure (that has the FOURCC specified in the fccIOProc parameter) from the table of installed I/O procedures.
MMIO_FINDPROC
Finds a previously installed I/O procedure with the identifier with the FOURCC specified in the fccIOProc parameter.

rc (PMMIOPROC) - returns

Upon successful completion, this function returns the address of the I/O procedure that was installed, removed, or searched for. If a failure occurs, NULL is returned.

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