IOCTL_INTERNAL_PARALLEL_PORT_FREE IOCTL (parallel.h)
The IOCTL_INTERNAL_PARALLEL_PORT_FREE request frees a parallel port. After using a parallel port, a client must free it. Microsoft recommends using the system-supplied PPARALLEL_FREE_ROUTINE callback to free a parallel port because there is no functional advantage to using an IOCTL_INTERNAL_PARALLEL_PORT_FREE request to free the port.
For more information, see Synchronizing the Use of a ParallelPort.
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 ports.
Requirements
| Requirement | Value |
|---|---|
| Header | parallel.h (include Parallel.h) |