UsbBuildOsFeatureDescriptorRequest macro

The UsbBuildOsFeatureDescriptorRequest macro formats an URB to request a Microsoft OS feature descriptor.

Syntax

void UsbBuildOsFeatureDescriptorRequest(
  [in, out]      PURB       Urb,
  [in]           USHORT     Length,
  [in]           UCHAR      Interface,
  [in]           USHORT     Index,
  [in, optional] PVOID      TransferBuffer  ,
  [in, optional] PMDL       TransferBufferMDL    ,
  [in]           ULONG      TransferBufferLength
);

Parameters

• Urb [in, out]
  Pointer to a caller-allocated URB structure to be formatted as a request for a Microsoft OS feature descriptor.

• Length [in]
  Specifies the size, in bytes, of the URB structure.

• Interface [in]
  Specifies the interface number for the requested Microsoft OS feature descriptor.

• Index [in]
  Specifies the index number of the requested Microsoft OS feature descriptor.

• TransferBuffer [in, optional]
  Pointer to a resident buffer that receives the descriptor data. If an MDL is supplied in TransferBufferMDL, then TransferBuffer is NULL.

• TransferBufferMDL [in, optional]
  Pointer to an MDL that describes a resident buffer that receives the descriptor. If a buffer is supplied in TransferBuffer, then TransferBufferMDL is NULL. The MDL must be allocated from nonpaged pool.

• TransferBufferLength [in]
  Specifies the length, in bytes, of the buffer specified in TransferBuffer or TransferBufferMDL.

Return value

This macro does not return a value.

Requirements

See also

URB

URB_OS_FEATURE_DESCRIPTOR_REQUEST

USB device driver programming reference

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