Stack Overflow
Stack Overflow

Questions tagged [qtembedded]

Qt for Embedded Linux is a C++ framework for GUI and application development for embedded devices.

Qt for Embedded Linux is a C++ framework for GUI and application development for embedded devices. It runs on a variety of processors, usually with Embedded Linux. Qt for Embedded Linux provides the standard Qt API for embedded devices with a lightweight window system.

The official Qt documentation can be found here for Qt 4.8

83 questions
7
votes
1 answer

Which is the best approach while deploying qml files in embeded application?

I am working for an embedded project, UI developed in QML and backend logic developed using DB/other system calls in C++/Qt. Which is the best approach to deploy qml files? Does It adding to .qrc (as resource) and compile to executable…
Ashif
  • 1,652
  • 14
  • 30
6
votes
1 answer

Qt Streaming Large File via HTTP and Flushing to eMMC Flash

I'm streaming a large file ( 1Gb ) via HTTP to my server in Qt on a very memory constrained embedded Linux device. When I first receive the header I determine where to write the data on the filesystem, create a QFile pointer to that location, and…
PhilBot
  • 748
  • 18
  • 85
  • 173
6
votes
2 answers

Qt Embedded exchanged colors bits: Red and Blue

I'm using QtEmbedded (4.8.0) on an ARM display device with 16bits color depth on the framebuffer (/dev/fb0). At this scenario we are getting the colors bits RED and BLUE exchanged. We are using the following compile flags: ./configure -embedded arm…
André G. Andrade
  • 501
  • 11
  • 21
4
votes
3 answers

Qt Embedded for Linux. Keyboard layout switching

I'm developing application with Qt Embedded and run it in linux framebuffer. I need a way to type non-US characters. Is it possible to change keyboard layout with Qt? I tried to run it on Qt/X11. Layout switching and input are perfectly fine…
Vanuan
  • 31,770
  • 10
  • 98
  • 102
4
votes
1 answer

Qt custom widget update big overhead

We are trying to use Qt 4.8.5 for some Linux-based embedded devices in our company. I use Qt embedded without X server. I need to plot measured data and update them very often (20-30fps, but only a small portion of the widget). The system is ARM…
xdever
  • 41
  • 4
4
votes
2 answers

Qt QTcpSocket with QtConcurrent::run Needs Event Loop in Separate Thread

I have a web server in Qt that will read a very large ( ~1Gb ) file and return the data to the requestor through a QTcpSocket. This socket is created by the main server thread. I want to use QtConcurrent to hand off this socket to a worker thread…
PhilBot
  • 748
  • 18
  • 85
  • 173
4
votes
1 answer

Qt Embedded Touchscreen QMouseEvents Not Received Until MouseButtonRelease Received

I am using Qt 4.8.3 on a small ARM embedded Linux device with a touchscreen. I have my touchscreen configured with tslib and calibrated it so there is a pointercal file in /etc/. The locations of my touch events work just fine but no matter what I…
PhilBot
  • 748
  • 18
  • 85
  • 173
3
votes
1 answer

How to change QWS_SIZE in qt application?

We usually export qt embedded environment variables like this: export QWS_DISPLAY=[:]...[:] export QWS_SIZE=800*600 export LD_LIBRARY_PATH=/usr/local/lib:$QTDIR/lib:$LD_LIBRARY_PATH Now I hope QWS_SIZE will be changed in my application .In other…
Carina
  • 2,260
  • 2
  • 20
  • 45
3
votes
1 answer

what is the difference between QT-Embedded and QTopia?

I have seen so many documentation about QT Embedded and QTopia. But not clear about the difference. Can anybody please explain the differences?
Surjya Narayana Padhi
  • 7,741
  • 25
  • 81
  • 130
3
votes
1 answer

QtEmbedded (for Kindle!): How are the device plugins supposed to get feedback from the app?

I'm not having an easy time making a workable mouse pointer interface on the Kindle with Qt (unofficial, of course). The fiveway joystick can't track more than one direction at a time (no diagonal moves), and the screen is too slow to update for…
darron
  • 4,284
  • 3
  • 36
  • 44
3
votes
1 answer

How to set QMainWindow as the modal one?

I am using QMainWindow for GUI development of my project..One problem I am Stuck with is blocking all other visible windows from getting input, while one is in operation. I can not use QDialog.Because rich features of QMainWindow is required. How…
manmatha.roy
  • 577
  • 1
  • 9
  • 22
3
votes
2 answers

Qt 4.8.4 QWS Server Programmatically Set Focus With Multiple Client Apps

I understand ( How does windowing work in qt embedded? ) that you should run one Application as the QWS Server to provide window management facilities, but that you can run other Apps with graphical interfaces as well in Qt Embedded for Linux. I…
PhilBot
  • 748
  • 18
  • 85
  • 173
3
votes
3 answers

How to (properly) output multilingual text in Qt-Embedded?

My target system is: linux 3.3.7, Qt Embedded (open source edition) 4.8, Droid fonts (taken from fonts-droid_20111207+git-1_all.deb Debian package and copied into /usr/lib/fonts directory), Linux Framebuffer for main Qt GUI application, everything…
qehgt
  • 2,972
  • 1
  • 22
  • 36
3
votes
0 answers

Programmatically change to a tty from an embedded qt application running on QWS framebuffer?

I'm wondering how to programmatically change to one of the available terminals from an embedded Qt application. The application is invoked via application -qws. Graphically it is configured with the Linux framebuffer (support compiled into the…
user257111
2
votes
2 answers

Newbie to Qt4 embedded Linux - Application management, deployment and general architecture?

First off, I apologise hugely for asking such basic questions. I am in the process of deciding if I should use Qt on an embedded linux device (first attempt will be on a TI OMAP EVM) for developing a UI and also for managing applications that run on…
Ringo
  • 21
  • 1
1
2 3 4 5 6