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LPGET_DESCRIPTOR (Windows Embedded CE 6.0)

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1/6/2010

This function sends a GET_DESCRIPTOR request to a universal serial bus (USB) device.

Syntax

typedef USB_TRANSFER (* LPGET_DESCRIPTOR)(
  USB_HANDLE hDevice,
  LPTRANSFER_NOTIFY_ROUTINE lpStartAddress,
  LPVOID lpvNotifyParameter,
  DWORD dwFlags,
  UCHAR bType,
  UCHAR bIndex,
  WORD wLanguage,
  WORD wLength,
  LPVOID lpvBuffer
);

Parameters

  • hDevice
    [in] Handle to a USB device.
  • lpStartAddress
    [in] Pointer to the address of a callback routine of type LPTRANSFER_NOTIFY_ROUTINE, or NULL if no callback routine is necessary.
  • lpvNotifyParameter
    [in] Pointer to the parameter to pass to a callback routine.
  • dwFlags
    [in] Value of USB_NO_WAIT or zero (0).
  • bType
    [in] Descriptor type. Set to USB_DEVICE_DESCRIPTOR_TYPE, USB_CONFIGURATION_DESCRIPTOR_TYPE, USB_STRING_DESCRIPTOR_TYPE, or a vendor-specific value.
  • bIndex
    [in] Index within a descriptor.
  • wLanguage
    [in] Language IDENTIFIER for string descriptors, zero (0) for others.
  • wLength
    [in] Size of the buffer.
  • lpvBuffer
    [in] Pointer to a buffer for descriptor data.

Return Value

A USB_TRANSFER handle indicates success. NULL indicates failure.

Remarks

This function initiates a control transfer to a USB device requesting device descriptor information. The device returns the contents of the device descriptor, starting at the index specified.

Requirements

Header usbdi.h
Windows Embedded CE Windows CE 2.10 and later

See Also

Reference

USB Host Driver Functions
LPABORT_TRANSFER
LPGET_TRANSFER_STATUS
LPIS_TRANSFER_COMPLETE
LPTRANSFER_NOTIFY_ROUTINE
LPSET_DESCRIPTOR