WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS function (wdfusb.h)

Artikel
10/21/2021

[Applies to KMDF and UMDF]

The WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS function initializes a WDF_USB_CONTROL_SETUP_PACKET structure for a device class-specific USB control transfer.

Syntax

void WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS(
  [out] PWDF_USB_CONTROL_SETUP_PACKET Packet,
  [in]  WDF_USB_BMREQUEST_DIRECTION   Direction,
  [in]  WDF_USB_BMREQUEST_RECIPIENT   Recipient,
  [in]  BYTE                          Request,
  [in]  USHORT                        Value,
  [in]  USHORT                        Index
);

Parameters

[out] Packet

A pointer to a WDF_USB_CONTROL_SETUP_PACKET structure.

[in] Direction

A WDF_USB_BMREQUEST_DIRECTION-typed value that is stored in the Packet.bm.Request.Dir member of the WDF_USB_CONTROL_SETUP_PACKET structure.

[in] Recipient

A WDF_USB_BMREQUEST_RECIPIENT-typed value that is stored in the Packet.bm.Request.Recipient member of the WDF_USB_CONTROL_SETUP_PACKET structure.

[in] Request

A request type constant that is stored in thePacket.bRequest member of the WDF_USB_CONTROL_SETUP_PACKET structure.

[in] Value

A request-specific value that is stored in the Packet.wValue.Value member of the WDF_USB_CONTROL_SETUP_PACKET structure.

[in] Index

A request-specific index value that is stored in the Packet.wIndex.Value member of the WDF_USB_CONTROL_SETUP_PACKET structure.

Return value

None

Remarks

The WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS function does the following:

Zeros the WDF_USB_CONTROL_SETUP_PACKET structure.
Sets the Packet.bm.Request.Type member to BmRequestClass.
Sets other structure members by using the WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS function's input arguments.

To initialize a WDF_USB_CONTROL_SETUP_PACKET structure, the driver should call one of the following functions:

WDF_USB_CONTROL_SETUP_PACKET_INIT
WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS
WDF_USB_CONTROL_SETUP_PACKET_INIT_FEATURE
WDF_USB_CONTROL_SETUP_PACKET_INIT_GET_STATUS
WDF_USB_CONTROL_SETUP_PACKET_INIT_VENDOR

Examples

The following code example initializes a WDF_USB_CONTROL_SETUP_PACKET structure.

WDF_USB_CONTROL_SETUP_PACKET  packet;
WDF_USB_CONTROL_SETUP_PACKET_INIT_CLASS(
                                        &packet,
                                        BMREQUEST_HOST_TO_DEVICE,
                                        BMREQUEST_TO_DEVICE,
                                        0,
                                        0,
                                        0
                                        );

Requirements

Requirement	Value
Target Platform	Universal
Minimum KMDF version	1.0
Minimum UMDF version	2.0
Header	wdfusb.h (include Wdfusb.h)

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