I've installed recent Qt (4.5.3) sdk windows version. I'm want to use mysql in my app. Since Qt Mysql plugin in not available, so I compiled it from the included source. I copied compiled files D:\\Qt\2009.01\qt\plugins\sqldrivers. Now when I run my application it still error "QMYSQL driver not loaded". ...
Hello, I have never worked with QThread in Qt, or with threads in general, so the topic is more then new to me. Still I have to use QThread's in order to avoid the blocking of my main application due to some heavy computations. So I want to put my heavy computations in a thread and if they take too much time I want to kill the thread (...
I try to communicate via TCP Socket between a QT4-Application (MyApp) and Cayuga (written in C++). The connection part works fine, i.e. Cayuga connects to MyApp. Now, MyApp is sending some data to Cayuga, but nothing is received. void MyApp::init() QTcpServer *m_server; QTcpSocket *clientConnection; //Open socket for transmission m...
I want to display some QTextEdits over my main window at arbitrary locations. Below is my first attempt. It doesn't quite work. If I create the text edits before I show the window, the text edits appear, but if I create them after I have shown the window they don't appear. What's up with that? How can I get the ones created later to...
Hello, I have the following tree structure of a library: -1.axel -2.trunk -3.axel -4.src -3.knot -4.axel -5.QComplexInvariants -QComplexInvariants.pro -3.subdivix -4.include -3.realroot -4.include -3.linalg -4.include -3.shape -4.include In QComplexInvariants I have sev...
In my Qt4 application I can't seem to hide certain options in the system Menu bar on OS X such as 'Services'. Any ideas? ...
I want to create a tiny app which needs global shortcuts. So, I have downloaded the current version of libqxt (0.5.1) and opened as a project in Qt Creator. Libqxt compiles without problems in this way, so I thought that adding this in the tab Dependencies of my project it would get added automatically in the build, like Eclipse does wi...
I'm using Qt 4.5 and im working with a QList<QStringList> which is a list of string list. Now I want to replace one string inside one stringList but with it seems unusual to type. I have found the following way of doing it and was wondering if it is ok: QList <QStringList> pDataList; pDataList[listIndex].replace(QStringIndex, newStri...
I have browsed the documentation, but didn't find one. Any ideas? ...
Hey, I just finished half of "the C++ GUI Programming with Qt 4". I wanted to find some small-scale or medium-scale opensource projects that are built on Qt 4, then I can learn something from the source code. Could anyone recommend some projects from your experience when you start to learn Qt? Thanks a lot. ...
Hello, I am slowly getting used to using the Qt4 GUI framework. In a project I am working on, I need to be able to add/edit/remove Team objects in a list. Coming from a C#.NET perspective, I would do something like List<Team> teams = new List<Team>(); teamsListBox.DataSource = teams; teamsListBox.DisplayMember = "Name"; Then use butt...
I am using Qt designer and I know how to use a QVBoxLayout and QGroupBox but it seems there is no such thing as a QGroupVBoxLayout. So I have to put a QVBoxLayout inside of a QGroupBox but if I modify the dimensions of one I have to do the same to the other. Is there a way to make them change dimensions together directly from QT design...
Hi all, I would like to execute a QMenu object at the position of text cursor in a QPlainTextEdit. My problem is that QTextCursor is only define by its position in the Text (index of the character). How can I find global position of the QTextCursor? Should I use an other object than QTextCursor in order to find the position of the text...
I am writing a command-line Qt4 script (using QCoreApplication) on Mac OS X. I am using this code adapted from C++ Programming with Qt 4, 2nd ed. p. 313: QTemporaryFile outFile; if (!outFile.open()) return; QString fileName = outFile.fileName(); QTextStream out( out << initial_text; outFile.close(); QProcess::execute(editor, QStr...
The specializations of QGraphicsLayout (e.g. QGraphicsLinearLayout) include an insertStretch method. What kind of object do QGraphicsLinearLayout::insertStretch method insert in the list of items managed by the layout? Better asked: what type of object is returned by QGraphicsLayout::itemAt method when called for a stretch position? ...
Hi. I want to include the libavcodec in my Qt-project. Should I do that with #include <ffmpeg/libavcodec.h> or with something more Qt, for example QLibrary mylib("libavcodec"); And also a question to understand if I really got it: To use libavcodec, do I need to import the source-files or the .dll? ...
I have a open file dialog with three filters: QString fileName = QFileDialog::getOpenFileName( this, title, directory, tr("JPEG (*.jpg *.jpeg);; TIFF (*.tif);; All files (*.*)") ); This displays a dialog with "JPEG" selected as the default filter. I wanted to put the filter list in alphabetical order so...
Is it possible to define the style of the selection marquee when a QGraphicsItem is set selectd via setSelected(true)? ...
Hello. I'm using qwt chart package and have encountered a problem. I've tried to combine few examples from the web-page into one, and log10scaleEngine behaves strange together with curves that are filled with color. The problem is with switching to log10scale: the curves are filled upwards (instead of downwards): 1) linear scale, 2) lo...