On 04/17/2018 09:15 AM, Thiago Macieira wrote:
On Monday, 16 April 2018 17:16:43 PDT Roland Hughes wrote:
All,
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:
http://www.dreamincode.net/forums/topic/148707-introduction-to-using-libusb-10/
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.
Of course, root, for an embedded system, isn't much of an issue. 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.
It does appear there should be some kind of support already there if one
built the webengine
roland@roland-I5-HP-Compaq-8300-Elite-SFF-PC:/$ sudo find -iname libusb
./home/roland/qt5.7.1/qt-everywhere-opensource-src-5.7.1/qtwebengine/src/3rdparty/chromium/third_party/libusb
./home/roland/qt5.7.1/qt-everywhere-opensource-src-5.7.1/qtwebengine/src/3rdparty/chromium/third_party/libusb/src/libusb
Not sure if that is still around in 5.xx or 6.x but 5.7.1 appears to
have included libusb 1.0.17
/* This file is parsed by m4 and windres and RC.EXE so please keep it simple. */
#include "version_nano.h"
#ifndef LIBUSB_MAJOR
#define LIBUSB_MAJOR 1
#endif
#ifndef LIBUSB_MINOR
#define LIBUSB_MINOR 0
#endif
#ifndef LIBUSB_MICRO
#define LIBUSB_MICRO 17
#endif
#ifndef LIBUSB_NANO
#define LIBUSB_NANO 0
#endif
/* LIBUSB_RC is the release candidate suffix. Should normally be empty. */
#ifndef LIBUSB_RC
#define LIBUSB_RC ""
#endif
ah
https://github.com/libusb/libusb/wiki/FAQ#Can_I_run_libusb_applications_on_Linux_without_root_privilege
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.
* udev homepage
<http://www.kernel.org/pub/linux/utils/kernel/hotplug/udev/udev.html>
* Debian's udev overview <http://wiki.debian.org/udev>
* Writing udev rules <http://www.reactivated.net/udevrules.php>
* Proper place to ask questions about udev rules
<http://vger.kernel.org/vger-lists.html#linux-hotplug>
<https://github.com/libusb/libusb/wiki/FAQ#how-can-i-run-libusb-applications-under-mac-os-x-if-there-is-already-a-kernel-extension-installed-for-the-device>
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.
--
Roland Hughes, President
Logikal Solutions
(630)-205-1593
http://www.theminimumyouneedtoknow.com
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