Obtaining Information About a Parallel Port

Before a client uses a parallel port, it can obtain information about the following:

• Resources used by the parallel port

• Hardware capabilities of the parallel port

• Parallel port callback routines that a kernel-mode driver can use

A client uses the following internal device control requests to obtain the above information:

IOCTL_INTERNAL_GET_PARALLEL_PORT_INFO

IOCTL_INTERNAL_GET_MORE_PARALLEL_PORT_INFO

IOCTL_INTERNAL_GET_PARALLEL_PNP_INFO

A client releases parallel port information by using an IOCTL_INTERNAL_RELEASE_PARALLEL_PORT_INFO request.