// usbprint.h

// CTL_CODE(0x0022, 0x011, METHOD_BUFFERED, FILE_ANY_ACCESS)
#define IOCTL_USBPRINT_GET_PROTOCOL 0x00220044
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Windows Driver Kit DDI reference (ni-usbprint-ioctl_usbprint_get_protocol)

Major Code: IRP_MJ_DEVICE_CONTROL

Description

Retrieve the current printer protocol code of the USB printer interface.

Parameters

Major code

Input buffer

NULL

Input buffer length

Output buffer

Pointer to a DWORD

Output buffer length

sizeof(DWORD)

Input/output buffer

Input/output buffer length

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

IOCTL_USBPRINT_GET_PROTOCOL - NtDoc