Hi, On Tue, April 17, 2018 16:39, Roland Hughes wrote: > On 04/17/2018 09:15 AM, Thiago Macieira wrote: >> On Monday, 16 April 2018 17:16:43 PDT Roland Hughes wrote: >>> I know the answer may well be RTFD, but, has raw USB communications >>> been >>> more integrated or are the libusb examples from 2008 "current"? >> Nothing changed since 2008. You need to run as root anyway, so it's not >> a >> functionality you should expect to see in Qt any time soon. > Interesting. > > I don't see any mention of needing to be root here:
> And the current "official" site http://libusb.info > It is user-mode: No special privilege or elevation is required for the > application to communicate with a device. You have 2 options: a) be root, b) setup a udev rule to make the USB device accessible to other users. I leave the task of guessing which one is recommended and which one happens most often in practice up to you as a practice. ;-) > Of course, root, for an embedded system, isn't much of an issue. Yes, it is. You can destroy the device as root. UIs or complicated calculations should never run as root. > One > would think that being a member of plugdev would give you USB access > much like being a member of dialout gives you access to serial port. One would think. But one would often be wrong. > It does appear there should be some kind of support already there if one > built the webengine Just because WebEngine uses it does not mean you get a public API from there. It actually means there is potential trouble since you may be running with 2 instances of libusb. > Can I run libusb applications on Linux without root privilege? > > Yes. > The standard solution is to use udev rules. Here are some links to udev > related websites. Correct. It is pretty easy, once you've read a few of those files. > Should prove to be an interesting experiment. I imagine a few dozen > people have written their own QObject based wrapper class for that > library but getting code contributed is monumentally impossible so they > are all one-offs. ...and they are likely very project dependent. Konrad _______________________________________________ Interest mailing list Interest@qt-project.org http://lists.qt-project.org/mailman/listinfo/interest
