IOCTL_INTERNAL_UNLOCK_PORT IOCTL (parallel.h)
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_INTERNAL_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
| Requirement | Value |
|---|---|
| Header | parallel.h (include Parallel.h) |
See also
IOCTL_INTERNAL_UNLOCK_PORT_NO_DESELECT