The misunderstanding is likely all in my head, but I’m having difficulties starting with the mount point to obtain the pid/vid, and vice versa. I can get all the mount points but have no way to associate them with a particular pid/vid. And I can obtain the pid/vid, as you mention, but have no way to find out what the mount point for them is. IORegistryExplorer doesn’t show you the mount point, does it?
-Carl > On Jul 8, 2015, at 5:07 PM, Roland King <[email protected]> wrote: > > Isn’t this just the flip side of the question you asked last month here > http://lists.apple.com/archives/usb/2015/Jun/msg00005.html > <http://lists.apple.com/archives/usb/2015/Jun/msg00005.html> > > There you said you started with the VID/PID and wanted the name, so if you > have that code and you used the VID/PID to find the name, then you know what > the VID/PID combination was because you used it to do the search in the first > place. > > Alternatively since you can see it in the explorer then just do what the > explorer does, get the IOUSBProperties for the io_object, either all of them > or the one for the vendor/product id code. If it doesn’t have one there then > get its parent and look there, exactly what you’d do if you were hunting up > the io registry explorer, there are properties at each level. The function > for getting one property by name is in that thread, getting them all is in > the same header as that function and the function for getting parents etc and > walking your way up and down the tree aren’t too hard to find in the > documentation. > > >> On 9 Jul 2015, at 04:34, Carl Hoefs <[email protected] >> <mailto:[email protected]>> wrote: >> >> Gordon, >> >> The devices we’re using are not the same, nor from the same vendor. One has >> an assigned PID/VID, the other only has a VID (PID is 0x0). iSerialNumber >> for both show 0x0 in IORegistryExplorer. >> >> So… what I’m hoping is either: >> - To find the BSD mount point based on PID/VID, or >> - To find PID/VID based on BSD mount point >> >> If I could do either of these, I’d be in business. As it stands, my app can >> find all mount points for modem-type devices, but I have no programmatic way >> to match them to a specific PID/VID. >> -Carl >> >> >>> On Jul 8, 2015, at 12:17 PM, Gordon Rankin <[email protected] >>> <mailto:[email protected]>> wrote: >>> >>> Carl, >>> >>> If the devices are identical and they do not have a unique serial number or >>> something differentiating them then the mount point will not be easy to >>> determine. >>> >>> We had this problem with USB Audio devices that had the same vid, pid and >>> serial number. We are now shipping all products with unique serial numbers >>> so the devices will be easier to find. >>> >>> Thanks, >>> Gordon >>> >>> On 7/8/15 3:00 PM, [email protected] >>> <mailto:[email protected]> wrote: >>>> Message: 1 >>>> Date: Tue, 07 Jul 2015 16:15:51 -0700 >>>> From: Carl Hoefs <[email protected] >>>> <mailto:[email protected]>> >>>> To: [email protected] <mailto:[email protected]> >>>> Subject: USB devices and BSD mount points >>>> Message-ID: >>>> <[email protected] >>>> <mailto:[email protected]>> >>>> Content-Type: text/plain; charset=utf-8 >>>> >>>> I have a Cocoa app (10.10.4) that needs to connect to two USB devices. For >>>> one device, the system will assign it a BSD mount point like >>>> “/dev/cu.usbmodem431”, and for the other device, “/dev/cu.usbmodem641”. >>>> However, sometimes the number changes, so the 431 will be 471, or the 641 >>>> will be 671, etc. >>>> >>>> Since the mount point is not fixed, what method can I rely on to determine >>>> which device is which? Will the one device always have an enumeration in >>>> the 400s, and the other in the 600s, or is this a completely arbitrary >>>> number? (It seems not to be arbitrary since the one device always shows up >>>> in the 400s and the other always in the 600s, but this seems like a very >>>> fragile assumption.) >>>> >>>> -Carl >>> >
_______________________________________________ Do not post admin requests to the list. They will be ignored. Usb mailing list ([email protected]) Help/Unsubscribe/Update your Subscription: https://lists.apple.com/mailman/options/usb/archive%40mail-archive.com This email sent to [email protected]
