IOCTL_PAR_QUERY_INFORMATION IOCTL (ntddpar.h)
The IOCTL_PAR_QUERY_INFORMATION request returns the status of an IEEE 1284 end-of-chain device.
Major code
Input buffer
None.
Input buffer length
None.
Output buffer
The AssociatedIrp.SystemBuffer member points to a PAR_QUERY_INFORMATION structure that the client allocates to output status information. The system-supplied bus driver for parallel ports sets the Status member to a bitwise OR of one or more of the following operating conditions:
PARALLEL_BUSY
PARALLEL_NOT_CONNECTED
PARALLEL_OFF_LINE
PARALLEL_PAPER_EMPTY
PARALLEL_POWER_OFF
PARALLEL_SELECTED
Output buffer length
The Parameters.DeviceIoControl.OutputBufferLength member is set to the size, in bytes, of a PAR_QUERY_INFORMATION structure.
Status block
If the request is successful, the Information member is set to the size, in bytes, of a PAR_QUERY_INFORMATION structure. Otherwise, the Information is set to zero.
The Status member is set to one of the generic status values returned by device control requests for parallel devices or to the following value:
STATUS_BUFFER_TOO_SMALL
The value of the Parameters.DeviceIoControl.OutputBufferLength member is less than the size, in bytes, of a PAR_QUERY_INFORMATION structure.
Requirements
| Requirement | Value |
|---|---|
| Header | ntddpar.h (include Ntddpar.h) |