IOCTL_INTERNAL_UNLOCK_PORT_NO_DESELECT IOCTL

Major Code:

IRP_MJ_DEVICE_CONTROL

Description

The IOCTL_INTERNAL_UNLOCK_PORT_NO_DESELECT request frees a parallel device's parent parallel port. The request does not deselect the parallel device on the parallel port.

This request is only supported in Windows XP and later.

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

Parameters

Major code

IRP_MJ_INTERNAL_DEVICE_CONTROL

Input buffer

None.

Input buffer length

None.

Output buffer

None.

Output buffer length

None.

Input/output buffer

Input/output buffer length

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.

See also

IOCTL_INTERNAL_UNLOCK_PORT

IOCTL_INTERNAL_LOCK_PORT_NO_SELECT

IOCTL_INTERNAL_LOCK_PORT