2.2.9.9 TS_URB_CONTROL_DESCRIPTOR_REQUEST

This packet represents the URB structure URB_CONTROL_DESCRIPTOR_REQUEST, as specified in [MSFT-W2KDDK] Volume 2, Part 4, Chapter 3. If the URB Function in URB_CONTROL_DESCRIPTOR_REQUEST is URB_FUNCTION_GET_DESCRIPTOR_FROM_DEVICE, URB_FUNCTION_GET_DESCRIPTOR_FROM_ENDPOINT, or URB_FUNCTION_GET_DESCRIPTOR_FROM_INTERFACE, the packet is sent using the TRANSFER_IN_REQUEST message with the OutputBufferSize field set to TransferBufferLength as defined in URB_CONTROL_DESCRIPTOR_REQUEST; otherwise, the packet is sent using the TRANSFER_OUT_REQUEST message with the OutputBufferSize field set to TransferBufferLength and the OutputBuffer field set to the data in TransferBuffer or TransferBufferMDL as defined in URB_CONTROL_DESCRIPTOR_REQUEST.


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TS_URB_HEADER

...

Index

DescriptorType

LanguageId

TS_URB_HEADER (8 bytes): A TS_URB_HEADER as specified in section 2.2.9.1.1.

Index (1 byte): A 8-bit unsigned integer. This value is from the Index field in URB_CONTROL_DESCRIPTOR_REQUEST.

DescriptorType (1 byte): A 8-bit unsigned integer. This value is from the DescriptorType field in URB_CONTROL_DESCRIPTOR_REQUEST.

LanguageId (2 bytes): A 16-bit unsigned integer. This value is from the LanguageId field in URB_CONTROL_DESCRIPTOR_REQUEST.