IOCTL_INTERNAL_UNLOCK_PORT IOCTL

The IOCTL_INTERNAL_UNLOCK_PORT request deselects a parallel device and frees the parallel device's parent parallel port.

For more information, see Locking and Unlocking a ParallelPort for Use by a Parallel Device.

Major Code

IRP_MJ_DEVICE_CONTROL

Input Buffer

None.

Input Buffer Length

None.

Output Buffer

None.

Output Buffer Length

None.

Status Block

The Information member is set to zero.

The Status member is set to one of the generic status values returned by internal device control requests for parallel devices.

Requirements

   
Header parallel.h (include Parallel.h)

See Also

IOCTL_INTERNAL_UNLOCK_PORT_NO_DESELECT

IOCTL_INTERNAL_LOCK_PORT_NO_SELECT

IOCTL_INTERNAL_LOCK_PORT