General and Desktop

Thanks so much for the explanation and your time! :)

Hi, When you say installing, did you use the same 32bit Qt libraries ?

You pass over the command line to QApplication / QCoreApplication. So you control what command line options Qt will see.

Note that qreal will be float by default on certain CPU architectures without floating point unit.

Hello, that is good to hear. Might help others trying out SQL with QT. Thank you for posting the solution. Please press Edit under your picture on first post and change title to [SOLVED] if possible. Best Regards

[quote author="opengpu" date="1425201724"]first of all, sorry to start a new thread, but i still can't post my reply...can i tried every way i can, still not work.[/quote]Have you tried my suggestion at http://qt-project.org/forums/viewthread/53616/ ? [quote author="opengpu" date="1425201724"]1. actually, i want to know whether Regular Qt module and features are affected if i disable OpenGL/ANGEL, eg.QGraphicsView, QtGui.[/quote]Most Qt modules don't use them. Only the Qt Quick-related modules (and obviously the special classes like QOpenGLFunctions) need OpenGL/ANGLE. Disabling them will only affect Qt Quick, not QWidget, QGraphicsView, etc. [quote author="opengpu" date="1425201724"]2. as i never use QtQuick, is it the same with with QML?[/quote]QML is a language (like C++ is a language). To use the Qt Quick module, you write QML code instead of C++ code. Please see the "documentation":http://doc.qt.io/qt-5/qmlapplications.html [quote author="opengpu" date="1425201724"]the things QtQuick can do, can also do with the normal Qt module?[/quote]Not really. Qt Quick provides advanced GUI features that other modules don't. [quote author="opengpu" date="1425201724"]3. how to disable them (OpenGL and ANGEL) all? is the answer: cofigure -no-opengl ? thank you very much![/quote]Yes.

I know. But you probably would not do much interconnection with Qt on huge datasets anyway. Note that there is quite a bit of API on the Qt containers that relies on the signed integers. Changing that would mean a huge break in source compatibility, making it much harder to port your code from a current Qt version to whatever Qt version would introduce such a break. Also note that Qt containers offer an std compatible interface. So, you can use all your std and compatible algorithms on the Qt containers if you so wish.

I turned out that this approach is not needed at all, proper sql drivers can be easily installed via apt-get or it can be added to control file in deb package. @apt-get install libqt4-sql-sqlite@ Marking as solved.

Well, I didn't find a fitting report so I created one myself: https://bugreports.qt.io/browse/QTBUG-44746

Hi, I'm using the latest qtsdk, so this is mingw 4.9.1 with Qt 5.4.1 I get the same behaviour in qt creator and in console

I thought Qt used OpenGL or ANGLE on Windows, not GDI...

configure -opengl dynamic

Interesting, I'm glad I've fixed it now. Thanks for the help!

Did you run it through a debugger ?

Ok, no error message about a missing lib ? QuaZip is also built with MSVC 2013 in 64 bit?

You might find more help in Pyqt4 but code you shown is not complete to give any advice. Something wrong probably happens in slot called. If it is helpAction you may try to comment lines started with a.init() and up and see what causes failure.

I don't see a problem with this. I would make sure that for each button created the auto default is disabled (setAutoDefault(false)) and only the default is set for the initial one intended to be the default. The options setDefault(TRUE | FALSE) might be problem depending on how (TRUE | FALSE) is defined. Maybe using just (true | false). If default buttons are changing maybe there is some additional code somewhere doing this?