// usbscan.h

typedef struct _IO_BLOCK_EX {
  unsigned uOffset;
  unsigned uLength;
  PUCHAR   pbyData;
  unsigned uIndex;
  UCHAR    bRequest;
  UCHAR    bmRequestType;
  UCHAR    fTransferDirectionIn;
} IO_BLOCK_EX, *PIO_BLOCK_EX;
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Windows Driver Kit DDI reference (ns-usbscan-_io_block_ex)

_IO_BLOCK_EX structure

Description

The IO_BLOCK_EX structure is used as a parameter to DeviceIoControl, when the specified I/O control code is IOCTL_SEND_USB_REQUEST. Values contained in structure members are used to create a USB Device Request (described in the Universal Serial Bus Specification).

Members

`uOffset`

Used as the Value field of a USB Device Request.

`uLength`

Length of the buffer to transfer.

`pbyData`

Pointer to a data buffer with a length of uLength.

`uIndex`

Used as the Index field of a USB Device Request.

`bRequest`

Used as the bRequest field of a USB Device Request.

`bmRequestType`

Used as the bmRequestType field of a USB Device Request.

`fTransferDirectionIn`

TRUE for transfers from device to host; FALSE for transfers from host to device.

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