On Mon, Oct 14, 2013 at 12:08 PM, Koehne Kai <kai.koe...@digia.com> wrote:
> > > -----Original Message----- > > From: development-bounces+kai.koehne=digia....@qt-project.org > > [mailto:development-bounces+kai.koehne=digia....@qt-project.org] On > > Behalf Of Mark > > Sent: Saturday, October 12, 2013 3:41 PM > > To: development@qt-project.org > > Subject: [Development] Difficulties using Qt's new categorized logging. > How > > to install filters? > > > > Hi, > > > > I just tried fiddling with the new Qt categorized logging and am hitting > some > > difficulties. I've read the documentation [1] and had a discussion on > irc (Qt- > > Labs) about how to install a global filter. > > > > The documentation states: > > // in a header > > Q_DECLARE_LOGGING_CATEGORY(QT_DRIVER_USB) > > > > // in one source file > > Q_LOGGING_CATEGORY(QT_DRIVER_USB, "qt.driver.usb") > > > > // usbEntries() will only be called if QT_DRIVER_USB category is enabled > > qCDebug(QT_DRIVER_USB) << "devices: " << usbEntries(); > > > > So the above line will only log when QT_DRIVER_USB is enabled. How do i > > enable it? It's a new category "qt.driver.usb" so by that logic i'm > inclined to > > think that i need to install a new filter for this category and enable > debugging > > in there. That would be something like this: > > > > QLoggingCategory usbCategory("qt.driver.usb"); > > usbCategory.setEnabled(QtDebugMsg, true); > > > > Now if i do: > > qCDebug(usbCategory) << "some logging"; > > > > > > Then it works as expected. But that's not what i want and not global. > How can > > i get the initial example to work - with QT_DRIVER_USB? > > > > I think it would be a good idea to update the documentation with this > > information as well. I tried following the testcase, but that didn't > help me > > much in getting this working either. > > Hi Mark, > > Indeed the documentation could be more verbose about this ... I'll try to > come up with a patch later on. Anyhow, the bottom line is that you should > either set logging rules via > > > http://doc-snapshot.qt-project.org/qt5-stable/qloggingcategory.html#setFilterRules > > or - if you need more control - set your own filter for categories: > > > http://doc-snapshot.qt-project.org/qt5-stable/qloggingcategory.html#installFilter > > > So, for your case, you could e.g. in main.cpp just add a line > > QLoggingCategory::setFilterRules(QStringLiteral("qt.driver.usb.debug = > true")); > > Regards > > Kai > Hi Kai, Thank you very much for your explanation! Would you also be able to provide an example for installFilter? Since that is the one where i can't figure out how it's supposed to work.
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