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From: Hans Petter Selasky <hselasky@c2i.net>
To: freebsd-usb@freebsd.org
Date: Mon, 8 Jun 2009 00:30:50 +0200
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References: <4A2B29C0.7020709@twilley.org>
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Cc: Jack Twilley <jmt@twilley.org>
Subject: Re: How to retrieve iManufacturer/iProduct information from
	libusb20?
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On Sunday 07 June 2009 04:45:20 Jack Twilley 
wrote:
> I have been looking through the source to 
usbconfig and other tools
> trying to figure out how to retrieve the 
iManufacturer and iProduct
> strings.  The libusb20 man page describes the
> libusb20_dev_get_device_desc() function but 
there's no useful
> information on the struct it returns.  The 
include file looks as if the
> struct is automagically generated by macros 
within macros which is too
> complicated for me to figure out without 
help.  Any ideas?  There's
> gotta be a better way than using 
LIBUSB20_DEVICE_DESC()...

After you find the string index, you can use the 
following function to get strings:

     int
     libusb20_dev_req_string_simple_sync(struct 
libusb20_device *pdev,
         uint8_t index, void *ptr, uint16_t len);


--HPS