General and Desktop

No problem. That's why these forums exists ;)

Try to access this file as root. On most linux systems, only root has access to /dev/input devices

I added a repaint() call at the end of the slot function. This seems to work. The screen gets updated faster now (i.e. after the first execution of the slot). Nevertheless, I have the feeling that this is probably not good practice... Are there other, better solutions ?

Thanks Serg :)

Right. Thanks. I've now filed a bug report for this: https://bugreports.qt-project.org/browse/QTBUG-25760 I've looked at the Qt source code, too, and I think I know how the problem could be fixed. I'll add more details to the QtBug...

Have a look at the file qglobal.h in the Qt sources for Q_DECLARE_PRIVATE and Q_D macros then revisits the QLineEdit sources. A beginners guide to hacking Qt? Not that I am aware of. Hacking Qt library sources in anything but the most trivial way is not a beginner's domain. You start with Qt Assistant, the code, online resources, and good deal of inquisitiveness when faced with some thing you don't immediately follow. You will need to walk before you can run. Chances are that in the process of learning you will discover you don't need to modify the Qt sources anyway.

Hi Rajveer, It depends on what information you are storing in the file and what information you want to display/ load in the tree as parent/child . You need to provide more information so that we can get a clear picture about your requirements.

okay, just added @"QMAKE_UIC += -tr TRAN_UI"@ to my project file with a name where TRAN_UI is my macro to handle translation with my fixed context. Works nicely.

Hi I need a help. I am trying to integrate the opencv2.3 with qt in ubuntu 11.04 but I got one error. The following is the Application output: "Starting /home/krishanu/Hello-build-desktop/Hello... OpenCV Error: Bad flag (parameter or structure field) (Unrecognized or unsupported array type) in cvGetMat, file /home/krishanu/OpenCV-2.3.0/modules/core/src/array.cpp, line 2482 terminate called after throwing an instance of 'cv::Exception' what(): /home/krishanu/OpenCV-2.3.0/modules/core/src/array.cpp:2482: error: (-206) Unrecognized or unsupported array type in function cvGetMat The program has unexpectedly finished. /home/krishanu/Hello-build-desktop/Hello exited with code 0" This is my source code: #include "opencv2/core/core.hpp" #include "opencv2/imgproc/imgproc.hpp" #include "opencv2/highgui/highgui.hpp" int main() { cv::Mat imag; imag= cv::imread("fruits.jpg"); cv::namedWindow("MyImage"); cv::imshow("Myimage",imag); cvWaitKey(5000); return 1; } This is my.pro file #------------------------------------------------- Project created by QtCreator 2012-05-14T18:08:31 #------------------------------------------------- QT += core QT -= gui TARGET = Hello CONFIG += console CONFIG -= app_bundle TEMPLATE = app SOURCES += main.cpp INCLUDEPATH +=/usr/include/opencv LIBS+=-lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_flann It would be of great help if someone would could help me.Thanks in advance.

You can get it if you follow this: "Building Qt5 from Git":http://qt-project.org/wiki/Building_Qt_5_from_Git

A good design principal in writing a setter is to make sure that the new value is different than the old value before doing any kind of assignment and signaling... @ void SomeClass::someSetter(int value) { if (value != the_current_value) { the_current_value = value; emit theValueChanged(value); } } @ This will prevent those kind of infinite loops without having to block signals.

Hi, You need to edit your first post and add [SOLVED] to the title :)

It's a pity, in my country English wasn't nationality language, I have limited things when approach new technology. Especially Listening skill ... but I will try :)

You are welcome. :)

The only disadvantage of this solution is, that it does not really work during runtime. Setting the value during application start-up works, but changing it later has no effect. For me this is currently not a problem, but I thought I should still mention it.