The IOCTL_INTERNAL_LOCK_PORT request allocates the parallel device's parent parallel port and selects the parallel device on the port.
For more information, see Locking and Unlocking a ParallelPort for Use by a Parallel Device.
Input Buffer Length
Output Buffer Length
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.
|Header||parallel.h (include Parallel.h)|