17.3.2 构造USB请求包

VOID 
UsbBuildGetDescriptorRequest(
IN OUT PURB  Urb,
IN USHORT  Length,
IN UCHAR  DescriptorType,
IN UCHAR  Index,
IN USHORT  LanguageId,
IN PVOID  TransferBuffer  OPTIONAL,
IN PMDL  TransferBufferMDL  OPTIONAL,
IN ULONG  TransferBufferLength,
IN PURB  Link  OPTIONAL
);

#001               UsbBuildGetDescriptorRequest(
#002                       urb, 
#003                       (USHORT) sizeof(struct _URB_
CONTROL_DESCRIPTOR_REQUEST),
#004                       USB_DEVICE_DESCRIPTOR_TYPE, 
#005                       0, 
#006                       0, 
#007                       deviceDescriptor, 
#008                       NULL, 
#009                       siz, 
#010                       NULL);