IOCTL_USBPRINT_GET_PROTOCOL IOCTL (usbprint.h)
Retrieve the current printer protocol code of the USB printer interface.
Major code
Input buffer
NULL
Input buffer length
0
Output buffer
Pointer to a DWORD
Output buffer length
sizeof(DWORD)
Status block
Irp->IoStatus.Status is set to STATUS_SUCCESS if the request is successful. Otherwise, Status to the appropriate error condition as a NTSTATUS code.
For more information, see NTSTATUS Values.
Remarks
IOCTL_USBPRINT_GET_PROTOCOL returns one of the following values:
| Defined constant | Value |
|---|---|
| USB_PRINTER_PROTOCOL_BIDI | 2 |
| USB_PRINTER_PROTOCOL_IPPOVERUSB | 4 |
Requirements
| Requirement | Value |
|---|---|
| Header | usbprint.h (include Usbprint.h) |