Subcategories

• General and Desktop
  

  This is where all the desktop OS and general Qt questions belong.

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  Posts

  

  You could, when you open the Window, select it manually with this

  Return the first Element of that Widget as Pointer with QListWidget->takeItem() and set it to selected.

• Mobile and Embedded
  

  The forum for developing everything embedded: Linux, WinCE, Symbian, MeeGo... you name it.

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  To put it bluntly: you don't have threads. Or more precisely your StatusThread dies after setTaskBar has been called and because you setup a QTimer that part will work, at least partially because you're making the main thread sleep for a long time so that won't make your GUI smooth.

  You should implement a real worker object doing the checkBatteryLevel work and have that object emit new data for the MainWindow to consume.

  As for your second thread it's even worse, you're creating an infinite blocking loop that will block the Qt event loop so there's nothing that can be done. And again, I don't see any reason for handling keyboard like that. Qt already provides all the infrastructure you need.

  Threading is a pretty tricky subject where it is very easy to shoot yourself in the foot in ways don't even realise your foot is gone and most of the leg with it. I'd recommend taking the time to read the QThread documentation and examples before going further.

• QML and Qt Quick
  

  Looking for The Bling Thing(tm)? Post here!

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  @DuBu You have to ask for example in the Qt Interest mailing list if you want to know why this actually happens, I don't know. I can just say that QML is declarative; it's meant to free you from thinking what happens inside. Therefore the inner workings are not necessarily intuitive. The problem comes from the fact that purely declarative programming isn't practical for our purposes and in QML/javascript declarative and imperative are mixed. Therefore you can accidentally bump into intricacies of declarative engine when you use something imperative. In practice what your snippet does may be like debugging a Prolog program by accident. In my opinion QML and this QML/javascript mix is far from perfect and will be superceded some day (within years or decades) but right now we have to live with strange things like this.

• Tools
  

  Have a question about Qt Creator, our cross-platform IDE, or any of the other tools? Ask here!

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  Qt 5.9 downloaded using qt-unified-windows-x86 (online installer).
  I installed packages for UWP 32bit, UWP64 bit and 32bit MinGW

  Btw I now removed to whole building directory (manually) and rebuilded the project and it does not complain.

  I'm puzzled here, will mark it solved after a few more tests.

• Installation and Deployment
  

  Your Qt just doesn't want to build? Your compiler can't find the libs? Here's where you find comfort and understanding. And help.

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  @SGaist Ah, then I should have just said, "No I haven't."

  What I was getting at is that this may have been around for quite some time. Some of the hits I found while searching were from over 2 years ago. The only people this sort of thing may be new to are those who have been using an old version of GCC. Or perhaps it is Debian specific with the way it associates files. I'm just a hobbiest hack that created an account here to help out the OP.
  If you think it should be passed along, by all means do so. :)

• Qt Cloud Services
  

  The public support forum for Qt Cloud Services. Ask your questions here. (formerly Enginio)

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  Hi
  I think its dead
  https://blog.qt.io/blog/2016/01/26/notification-for-all-qt-cloud-services-users/
  https://forum.qt.io/topic/64176/qt-cloud-services-future-and-alternatives

• Game Development
  

  What can we say - we like games. And you can use Qt to write some. Questions? Ask here.

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  Maybe there is a problem of context when you generate or modify the fbo while using Mac, where the Qt implementation may change context in one OS and not in the other. Another possibility is that the format may not be supported in Mac. There are OpenGL methods (and those from Qt) to enable you to perform context management, maybe just enforcing that you are handling a specific context in your functions will do the job (the makeCurrent stuff)

• Qt WebKit
  

  Questions about Qt WebKit and related topics? Post here!

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  Hi,

  I am using QT 5.5 version.

  I need to invoke javascript callback function from QT plugin with Structure/Object as argument. I could not modify HTML Application since it is not in our scope.

  HTML application code snippet

  var obj1 = document.getElementById('obj1_id'); //QT plugin object 1
  var obj2 = document.getElementById('obj2_id'); //QT plugin object 2

  obj2.init(obj1,callback); //QT API

  function callback(arg1)
  {
  if ( obj1 === arg1){
  // SUCCESS
  else
  // FAILURE
  }

  QT plugin code snippet

  class::init(QWebElement obj, QString callback)
  {
  //need to Invoke callback with obj argument
  }

  Can any one help me on this?

• QtWebEngine
  

  Discussions and questions on QtWebEngine

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  @ThatDud3 For the link that you have shared i get following .

• Qt Web Runtime
  

  All posts about Qt Web Runtime go here.

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  Hi,

  Looks like a known problem.

• Language Bindings
  

  You're using Qt with other languages than C++, eh? Post here!

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  Hi,

  This looks like it could be a job for QtConcurrent::run.

• 3rd Party Software
  

  Combining Qt with 3rd party libraries or components? Ask here!

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  Topics
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  Posts

  

  I did clean and then started from first

  Got the below output :)

  user@user-Inspiron-3558:~/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3$ make cd src/ && ( test -e Makefile || /home/user/Qt5.6.0/5.6/gcc_64/bin/qmake /home/user/Documents/QwtQwt_forcharts_documents/qwt-6.1.3/src/src.pro -o Makefile ) && make -f Makefile make[1]: Entering directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/src' compiling qwt_abstract_scale_draw.cpp compiling qwt_clipper.cpp compiling qwt_color_map.cpp compiling qwt_column_symbol.cpp compiling qwt_date.cpp compiling qwt_date_scale_draw.cpp compiling qwt_date_scale_engine.cpp compiling qwt_dyngrid_layout.cpp compiling qwt_event_pattern.cpp compiling qwt_graphic.cpp compiling qwt_interval.cpp compiling qwt_interval_symbol.cpp compiling qwt_math.cpp compiling qwt_magnifier.cpp compiling qwt_null_paintdevice.cpp compiling qwt_painter.cpp compiling qwt_painter_command.cpp compiling qwt_panner.cpp compiling qwt_picker.cpp compiling qwt_picker_machine.cpp compiling qwt_pixel_matrix.cpp compiling qwt_point_3d.cpp compiling qwt_point_polar.cpp compiling qwt_round_scale_draw.cpp compiling qwt_scale_div.cpp compiling qwt_scale_draw.cpp compiling qwt_scale_map.cpp compiling qwt_spline.cpp compiling qwt_scale_engine.cpp compiling qwt_symbol.cpp compiling qwt_system_clock.cpp compiling qwt_text_engine.cpp compiling qwt_text_label.cpp compiling qwt_text.cpp compiling qwt_transform.cpp compiling qwt_widget_overlay.cpp compiling qwt_curve_fitter.cpp compiling qwt_abstract_legend.cpp compiling qwt_legend.cpp compiling qwt_legend_data.cpp compiling qwt_legend_label.cpp compiling qwt_plot.cpp compiling qwt_plot_renderer.cpp compiling qwt_plot_xml.cpp compiling qwt_plot_axis.cpp compiling qwt_plot_curve.cpp compiling qwt_plot_dict.cpp compiling qwt_plot_directpainter.cpp compiling qwt_plot_grid.cpp compiling qwt_plot_histogram.cpp compiling qwt_plot_item.cpp compiling qwt_plot_abstract_barchart.cpp compiling qwt_plot_barchart.cpp compiling qwt_plot_multi_barchart.cpp compiling qwt_plot_intervalcurve.cpp compiling qwt_plot_zoneitem.cpp compiling qwt_plot_tradingcurve.cpp compiling qwt_plot_spectrogram.cpp compiling qwt_plot_spectrocurve.cpp compiling qwt_plot_scaleitem.cpp compiling qwt_plot_legenditem.cpp compiling qwt_plot_seriesitem.cpp compiling qwt_plot_shapeitem.cpp compiling qwt_plot_marker.cpp compiling qwt_plot_textlabel.cpp compiling qwt_plot_layout.cpp compiling qwt_plot_canvas.cpp compiling qwt_plot_panner.cpp compiling qwt_plot_rasteritem.cpp compiling qwt_plot_picker.cpp compiling qwt_plot_zoomer.cpp compiling qwt_plot_magnifier.cpp compiling qwt_plot_rescaler.cpp compiling qwt_point_mapper.cpp compiling qwt_raster_data.cpp compiling qwt_matrix_raster_data.cpp compiling qwt_sampling_thread.cpp compiling qwt_series_data.cpp compiling qwt_point_data.cpp compiling qwt_scale_widget.cpp compiling qwt_plot_svgitem.cpp compiling qwt_plot_glcanvas.cpp compiling qwt_abstract_slider.cpp compiling qwt_abstract_scale.cpp compiling qwt_arrow_button.cpp compiling qwt_analog_clock.cpp compiling qwt_compass.cpp compiling qwt_compass_rose.cpp compiling qwt_counter.cpp compiling qwt_dial.cpp compiling qwt_dial_needle.cpp compiling qwt_knob.cpp compiling qwt_slider.cpp compiling qwt_thermo.cpp compiling qwt_wheel.cpp moc qwt_dyngrid_layout.h compiling moc/moc_qwt_dyngrid_layout.cpp moc qwt_magnifier.h compiling moc/moc_qwt_magnifier.cpp moc qwt_panner.h compiling moc/moc_qwt_panner.cpp moc qwt_picker.h compiling moc/moc_qwt_picker.cpp moc qwt_text_label.h compiling moc/moc_qwt_text_label.cpp moc qwt_abstract_legend.h compiling moc/moc_qwt_abstract_legend.cpp moc qwt_legend.h compiling moc/moc_qwt_legend.cpp moc qwt_legend_label.h compiling moc/moc_qwt_legend_label.cpp moc qwt_plot.h compiling moc/moc_qwt_plot.cpp moc qwt_plot_renderer.h compiling moc/moc_qwt_plot_renderer.cpp moc qwt_plot_canvas.h compiling moc/moc_qwt_plot_canvas.cpp moc qwt_plot_panner.h compiling moc/moc_qwt_plot_panner.cpp moc qwt_plot_picker.h compiling moc/moc_qwt_plot_picker.cpp moc qwt_plot_zoomer.h compiling moc/moc_qwt_plot_zoomer.cpp moc qwt_plot_magnifier.h compiling moc/moc_qwt_plot_magnifier.cpp moc qwt_sampling_thread.h compiling moc/moc_qwt_sampling_thread.cpp moc qwt_scale_widget.h compiling moc/moc_qwt_scale_widget.cpp moc qwt_plot_glcanvas.h compiling moc/moc_qwt_plot_glcanvas.cpp moc qwt_abstract_slider.h compiling moc/moc_qwt_abstract_slider.cpp moc qwt_abstract_scale.h compiling moc/moc_qwt_abstract_scale.cpp moc qwt_analog_clock.h compiling moc/moc_qwt_analog_clock.cpp moc qwt_compass.h compiling moc/moc_qwt_compass.cpp moc qwt_counter.h compiling moc/moc_qwt_counter.cpp moc qwt_dial.h compiling moc/moc_qwt_dial.cpp moc qwt_knob.h compiling moc/moc_qwt_knob.cpp moc qwt_slider.h compiling moc/moc_qwt_slider.cpp moc qwt_thermo.h compiling moc/moc_qwt_thermo.cpp moc qwt_wheel.h compiling moc/moc_qwt_wheel.cpp rm -f libqwt.so.6.1.3 libqwt.so libqwt.so.6 libqwt.so.6.1 linking ../lib/libqwt.so.6.1.3 ln -s libqwt.so.6.1.3 libqwt.so ln -s libqwt.so.6.1.3 libqwt.so.6 ln -s libqwt.so.6.1.3 libqwt.so.6.1 rm -f ../lib/libqwt.so.6.1.3 mv -f libqwt.so.6.1.3 ../lib/ rm -f ../lib/libqwt.so rm -f ../lib/libqwt.so.6 rm -f ../lib/libqwt.so.6.1 mv -f libqwt.so ../lib/ mv -f libqwt.so.6 ../lib/ mv -f libqwt.so.6.1 ../lib/ make[1]: Leaving directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/src' cd textengines/ && ( test -e Makefile || /home/user/Qt5.6.0/5.6/gcc_64/bin/qmake /home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/textengines/textengines.pro -o Makefile ) && make -f Makefile make[1]: Entering directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/textengines' make[1]: Nothing to be done for `first'. make[1]: Leaving directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/textengines' cd doc/ && ( test -e Makefile || /home/user/Qt5.6.0/5.6/gcc_64/bin/qmake /home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/doc/doc.pro -o Makefile ) && make -f Makefile make[1]: Entering directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/doc' make[1]: Nothing to be done for `first'. make[1]: Leaving directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/doc' cd designer/ && ( test -e Makefile || /home/user/Qt5.6.0/5.6/gcc_64/bin/qmake /home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/designer/designer.pro -o Makefile ) && make -f Makefile make[1]: Entering directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/designer' compiling qwt_designer_plugin.cpp In file included from qwt_designer_plugin.h:13:0, from qwt_designer_plugin.cpp:23: /home/user/Qt5.6.0/5.6/gcc_64/include/QtDesigner/QDesignerCustomWidgetInterface:4:4: warning: #warning Header <QtDesigner/QDesignerCustomWidgetInterface> is deprecated. Please include <QtUiPlugin/QDesignerCustomWidgetInterface> instead. [-Wcpp] # warning Header <QtDesigner/QDesignerCustomWidgetInterface> is deprecated. Please include <QtUiPlugin/QDesignerCustomWidgetInte ^ compiling qwt_designer_plotdialog.cpp rcc qwt_designer_plugin.qrc compiling resources/qrc_qwt_designer_plugin.cpp moc qwt_designer_plugin.h compiling moc/moc_qwt_designer_plugin.cpp In file included from moc/../qwt_designer_plugin.h:13:0, from moc/moc_qwt_designer_plugin.cpp:9: /home/user/Qt5.6.0/5.6/gcc_64/include/QtDesigner/QDesignerCustomWidgetInterface:4:4: warning: #warning Header <QtDesigner/QDesignerCustomWidgetInterface> is deprecated. Please include <QtUiPlugin/QDesignerCustomWidgetInterface> instead. [-Wcpp] # warning Header <QtDesigner/QDesignerCustomWidgetInterface> is deprecated. Please include <QtUiPlugin/QDesignerCustomWidgetInte ^ moc qwt_designer_plotdialog.h compiling moc/moc_qwt_designer_plotdialog.cpp rm -f libqwt_designer_plugin.so linking plugins/designer/libqwt_designer_plugin.so /usr/bin/ld: skipping incompatible /home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/designer/../lib/libqwt.so when searching for -lqwt /usr/bin/ld: cannot find -lqwt collect2: error: ld returned 1 exit status make[1]: *** [plugins/designer/libqwt_designer_plugin.so] Error 1 make[1]: Leaving directory `/home/user/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3/designer' make: *** [sub-designer-make_first-ordered] Error 2 user@user-Inspiron-3558:~/Documents/Qwt/Qwt_forcharts_documents/qwt-6.1.3$

  Thanks,