Date: Mon, 08 Jun 2009 10:16:27 -0700 From: Jack Twilley <jmt@twilley.org> To: Sylvestre Gallon <ccna.syl@gmail.com> Cc: freebsd-usb@freebsd.org Subject: Re: How to retrieve iManufacturer/iProduct information from libusb20? Message-ID: <4A2D476B.20100@twilley.org> In-Reply-To: <164b4c9c0906070648gb7abd54o967c2daebf6e8032@mail.gmail.com> References: <4A2B29C0.7020709@twilley.org> <164b4c9c0906070648gb7abd54o967c2daebf6e8032@mail.gmail.com>
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Sylvestre Gallon wrote: > On Sun, Jun 7, 2009 at 4:45 AM, Jack Twilley<jmt@twilley.org> 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()... >> >> Jack. > > > You can use the function libusb20_dev_get_device_desc() that > returns a struct LIBUSB20_DEVICE_DESC_DECODED *. The field > idVendor and idProduct in the struct LIBUSB20_DEVICE_DESC_DECODED > are what you are looking for :) idVendor and idProduct look good according to the output of usbconfig, but whenever I try to refer to ddesc->idVendor (or anything else in that structure) I get "error: dereferencing pointer to incomplete type". This is what sent me looking through the includes for the actual type definition. Other than the usbconfig code that uses the LIBUSB20_DEVICE_DESC() macro, is there any other example code out there that does what I'm trying to do? > > Cheers, > Thanks! Jack.
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