Qt is an application framework originally created by Trolltech and currently managed by Digia. The KDE desktop uses the Qt framework for its applications.

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QtWebSockets not available on Ubuntu Touch

I'm developing an Ubuntu Touch application which communicates with a server using WebSockets. Qt offers its own API since version 5.3, which can be used from a QML file by adding import QtWebSockets ...
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Qt Creator fails in designer tab

Qt Creator in designer tab displays black frames. At the same time in Konsole I have the following message several times (more than 30 times): QQuickWidget cannot be used as a native child widget. ...
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Cannot detect if a MouseArea is over a GridView item

This question is not specific for the Ubuntu platform, but as I am developing an Ubuntu Touch app, I'd like to ask first here. I have a list of UbuntuShapes arranged in a GridView - generated from a ...
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2answers
1k views

qt can't find GL/gl.h but libGL.so exists

I am running 64 bit Ubuntu 14.04. The compile error I am getting is: In file included from ../../../Qt/5.4/gcc_64/include/QtOpenGL/qgl.h:39:0, from ...
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Serial port blocked. How can I detect what it is?

I am using Qt (QSerialPort) to handle the port. At startup, I am attempting to open the port every second. It takes in average 12 cycles not to get back an error, which is: ...
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How to install libQtGui.so.4 32bit on 64bit ubuntu

I am trying to compile the android tree on Ubuntu 64bit 12.04; The build fails on an error of missing shared library libQtGui.so.4; Check /usr/ lib files i found that: /usr/lib/ or /usr/lib32 doesn't ...
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Running QLandkarte GT on 1024x600 resolution

When I start QLandkarte I found that it has no maximize/minimize/close buttons on right window corner and it fits uncomfortable in 1024x600 resolution screen. QLandkarte window don't fill screan width ...
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How to get and install qt header and libraries in specific folder?

Where do I get qt header and libraries from? And then how do I install qt header and libraries in specific folder?
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Change tab from code using ubuntu SDK

How to change tab using code in QML in Ubuntu SDK? The answer is: If tabs are defined as follows: Tabs { id: tabs ..... } then using this: tabs.selectedTabIndex = 0 will get ...
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2answers
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“Failed to load platform plugin ”xcb“ ” while launching qt5 app on linux without qt installed

I wrote application for linux which uses QT5. But when I am trying to launch it on the linux without QT SDK installed, the output in console is: Failed to load platform plugin "xcb". Available ...
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23 views

Cannot execute QT console program in ubuntu [duplicate]

An error occurred. Starting /media/milo/DATA1/Milo/C++/build-test-Desktop-Debug/test... Cannot execute '/media/milo/DATA1/Milo/C++/build-test-Desktop-Debug/test': Permission denied ...
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Problem compiling with QT4 libraries in pbuilder

I am having trouble getting pbuilder or launchpad to build a package that uses the QT4 libraries. The build script that I am using is below ( I didn't write it ). It compiles fine on a vanilla ...
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1answer
30 views

Use g++-4.8 with Qt

I am trying to compile a Qt project that uses the "override" keyword, and thus needs GCC 4.8. I have installed GCC 4.8 on my Ubuntu 12.04 machine already, and it lives in /usr/bin as gcc-4.8 and ...
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2answers
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Ubuntu Qmake is not an executable

I have the latest versions of qtcreator, qt5-qmake build-essential and g++ installed. In option of Build & Run and choose qmake in /usr/bin/qmake I get this error: The qmake executable ...
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1answer
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Ubuntu 15.04: Change KDE application's icons

is there a way to change the icon theme that is used by KDE applications like Krusader in Unity? KDE systemsettings don't work any more. Can't I just edit some file? Thanks
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Static QT libraries for Ubuntu 14.04

Is there a package which contains all static QT 5 libraries? There are only some static libraries in the qtbase5-dev package (and its dependencies). To be more precise, the static versions of Qt5Test, ...
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3answers
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QML: Simplest way to write to a text file?

QML at the moment lacks basic system commands, so I am looking for the most simple template to write to /tmp/text.txt.
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1answer
143 views

Program[Digikam] chooses wrong qt lib and crashes

I run Ubuntu 14.04 64bit. Digikam used to work but recently stopped working. I was wondering if someone could help me work a way to resolve this issue. I've had a response from the Digikam mailing ...
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1answer
59 views

QAxObject: No such file or directory

I have created a QT 5 Console Application for read an xls file, but when I include QAxBase and QAxObject header files it gives me following error: error : QAxObject: No such file or directory My ...
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Adding qt4 and qt5 to global path

I have downloaded a source code from github. It is using qt and in many files it has the following headers included: #include <QApplication> #include <QApplication> #include ...
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5answers
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Symbol lookup error: /usr/lib/i386-linux-gnu/libQtOpenGL.so.4: undefined symbol: _ZNK14QWidgetPrivate17hasHeightForWidthEv

I installed skype using several process in my newly installed Ubuntu 14. 04 64 bit... it shows a skype icon in dash... but when I click on it, nothings happens. What can I do? I tried almost ...
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Focus Writer 1.4.4 has an error when I type in Korean

$ focuswriter QGtkStyle was unable to detect the current GTK+ theme. QString::arg: Argument missing: "문단: % L1" , 0 QString::arg: Argument missing: "문단: % L1" , 0 QString::arg: Argument missing: "문단: ...
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52 views

Can you use QProcess in a Click Packaged Application?

I am just curious whether this is something AppArmor allows or not? My application works fine on the desktop, but I can't get Standard output or error to even display in my app when I run it from the ...
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123 views

Unity desktop on Raspberry Pi 2

The first thing needed to make it work is a driver. There was a Mesa and DRM driver for Broadcom VC4 developed recently by Eric Anholt. It's an OpenGL driver. http://dri.freedesktop.org/wiki/VC4/ ...
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59 views

Build libqtwebkit4.so from sources

I'm trying to build libqtwebkit4 from sources : https://launchpad.net/ubuntu/+source/qtwebkit-source Everything goes right: I have instilled all dependencies (gtk3, glib, pango,...) ./autogen.sh ...
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13 views

CoverFlow app for Screenshots

Does anyone remember how the tiny little KDE/QT tool to create stylish (reminiscent of iTunes' CoverFlow effect) screenshots with reflections? One could select some screenshots (or other pictures) and ...
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2answers
40 views

File access outside application directory

I want to know is it possible to access files outside the application directory? e.g. /home/phablet, /media, etc. Okay, so precisely I want to use QDir and QFile to read the folders and the files ...
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Virtual box crashes with undefined symbol

When executing Virtual Box through GUI doesn't pop up anything using terminal it crashed with error: root@mayur-laptop:/home/mayur/Documents/MyOs# virtualbox VirtualBox: ...
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1answer
384 views

Autokey (autokey-qt) freezes and won't insert text

Per some suggestions on here and lifehacker, I began using autokey. It worked great for a week, but as of today it now hangs when I try to enter name new phrases. usually won't close when I push ...
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77 views

Qt Multimedia doesn't seem to work on Touch

Using Qt package 'Multimedia' to get cameras on the bq phone: QList<QCameraInfo> cameras = QCameraInfo::availableCameras(); cameras.size() always returns zero. Host 14.04, target 14.10, Qt ...
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1answer
296 views

Problem installing QtOctave

First I installed MATLAB and I got stuck here: No MATLAB executables were found in the directories you specified. This package requires at least one local installation of MATLAB. I was unable to ...
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1answer
142 views

build-essential installation failing

I am having trouble accessing the several critical header files that show to be a part of the build process. The Ubuntu Software Center shows that build-essential is installed: Next I did the ...
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1answer
35 views

disable automaic update for texmaker [duplicate]

I'm new to Ubuntu 15.04 and I experienced problems with Temaker, namely the keyboard shortcuts did not work after some time. However, manually installing the version compiled with Qt4 fixed the ...
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KDE/QT applications on Xubuntu 15.04 are horrible

All installed KDE/QT applications on Xubuntu 15.04 are horrible (clementine, digikam, etc...). I think the layout miss all kde/qt library. See there http://postimg.org/image/ng087lkkb/ Why? How can ...
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101 views

How to make Qt apps use GTK+ style in Xubuntu 15.04?

I'm using Ubuntu 15.04 right now, and Qt apps like qBittorrent and Clementine looks like they were GTK+ apps, they use the systems icons and style. But I installed Xubuntu in another PC and doesn't ...
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66 views

Problem with installing Qt5.3

I am trying to install Qt5.3 into my Ubuntu 14.04(64 bit). While installation process was running suddenly it was showing some prompts and showed several error messages as following: Error during ...
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1answer
59 views

Ubuntu Phone - detect system type Desktop or Mobile

Is there a way to detect platform from QML or Qt C++ classes? I have Qt/QML project supplied to Linux/Android/Windows at one time, I see it's possible to deploy it to Ubuntu Phone. Is there a way to ...
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1answer
19 views

How to add packages installed manually to the system's package database?

I installed QT Creator by off-line installer in Ubuntu 14.04 and now i want to install Ubuntu SDK but it still lists QT Creator as software that need to be installed in the system. Ubuntu Software ...
8
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1answer
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Cannot mix incompatible Qt library

I found a lot of problems similar to mine on the web, but still no real solution. I'm having the annoying Cannot mix incompatible Qt library (version 0x40806) with this library (version 0x40802) ...
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ubuntu licence for commercial apps

I want to submit a commercial application in ubuntu software center... in publish process there is a part that ask licence file (list of numbers) First, what is the syntax of this file? Second, how ...
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0answers
33 views

Can't start ubuntu-sdk

On Ubuntu 14.04.1 LTS 64 bit, I did: sudo add-apt-repository ppa:ubuntu-sdk-team/ppa sudo apt-get update && sudo apt-get install ubuntu-sdk sudo apt-get update && sudo apt-get ...
2
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1answer
93 views

How to install PyQt for python3 in ubunt 14.10?

I found some tutorials online for earlier versions of Ubuntu but they didn't seem to work on Ubuntu 14.10, either that or I was doing it the wrong way, I want to use QtDesigner to design a GUI, use ...
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1answer
269 views

Qt creator: “cannot find -lGl” Cannot install libglu1-mesa-dev

I am trying to compile and run a QT program. I have already tried windows (couldn't get taglib to compile); I also tried OSX, I compiled but the program crashes even though it doesn't crash on my ...
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1answer
109 views

How to make and application for Ubuntu phone OS in QT creator? [closed]

I want to develop and application for Ubuntu Phone os. How to do this in QT creator? Is it really possible to create an app for ubuntu phone os? or is does the Ubuntu phone apps made in the same way ...
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1answer
220 views

Ubuntu 12.04 - Install newer libqtwebkit4 instead 2.2.1 for ScudCloud

I am trying to install ScudCloud, but it requires libqtwebkit4 version 2.3.2 or greater. Unfortunately, in Ubuntu 12.04 the latest version still remains in 2.2.1. Is there a PPA or an alternative ...
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1answer
75 views

Use the design function of Qt Creator when developing Ubuntu apps

I would like to start developing Ubuntu apps with Qt Creator and I have a few queries when making a simple qml qt app. Firstly, is it normal qml and javascript? Can I use all normal qml and ...
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1answer
82 views

Building ubuntu touch app with sql (mysql) support problem

i`m trying to develop simple ubuntu application. This application should connect to remove mysql server, query and display data in UbuntuListView. Project was created in Qt Creator 3.1.1 as QML app ...
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1answer
128 views

Ubuntu 14.10 : Qt5 assistant not found

I am working on a system running Ubuntu 14.10 in which I have started programming on Qt5. Before for few months when I was working on Qt, I found that that QT-assistant tool really comes in handy. I ...
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2answers
36 views

Problem while opening Qt

Cannot overwrite file /home/sauron/.config/QtProject/qtcreator/qtversion.xml: Permission denied. Why does this message show up every time I open Qt?
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1answer
53 views

marble-touch offline map viewer fails to start

Ubuntu 14.04 with Unity, marble-touch 4:4.13.3-0ubuntu0.1. It doesn't start: $ marble-touch qrc:/main.qml:13:1: Type MarbleWindow unavailable qrc:/MarbleWindow.qml:11:1: module "com.nokia.meego" is ...