// usbioctl.h

typedef struct _USB_MI_PARENT_INFORMATION {
  ULONG NumberOfInterfaces;
} USB_MI_PARENT_INFORMATION, *PUSB_MI_PARENT_INFORMATION;
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Windows Driver Kit DDI reference (ns-usbioctl-_usb_mi_parent_information)

_USB_MI_PARENT_INFORMATION structure

Description

The USB_MI_PARENT_INFORMATION structure contains information about a composite device.

Members

`NumberOfInterfaces`

The number of interfaces on the composite device.

Remarks

A composite device is a device with multiple interfaces (MI). The USB stack treats the interfaces of a composite device as child devices of the composite device and creates a separate PDO for each interface.

USB_MI_PARENT_INFORMATION - NtDoc