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This function sends a GET_DESCRIPTOR request to a USB device.
USB_TRANSFER GetDescriptor( 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, or NULL if no callback routine is necessary.
- lpvNotifyParameter
- [IN] Pointer to the parameter to pass to a callback routine.
- dwFlags
- [IN] Either of the values USB_NO_WAIT or 0.
- bType
- [IN] The descriptor type, one of the values 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] Specifies a language IDENTIFIER for string descriptors, 0 for others.
- wLength
- [IN] Specifies the size of the buffer.
- lpvBuffer
- [IN] Pointer to a buffer for descriptor data.
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
Runs on Versions Defined in Include Link to Windows CE OS 2.10 and later Note This API is part of the complete Windows CE OS package as provided by Microsoft. The functionality of a particular platform is determined by the original equipment manufacturer (OEM) and some devices may not support this API.
See Also
AbortTransfer, GetTransferStatus, IsTransferComplete, SetDescriptor
Last updated on Tuesday, July 13, 2004