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  • Which is better? Qt Creator or Visual Studio IDE

    - by user249490
    I am currently using Qt Creator 1.3 for my Qt applications. I know it uses jom for make step which is better when we have multi core processors. But besides that what are all the advantages of using both the IDEs? Dis advantages as well? I am using CL compiler though for compiling my applications. Is there any other specific advantages and disadvantages of these IDEs?

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  • How to insert item which type is QString to a ComboBox in Qt?

    - by Hanny
    I have an item which type is QString: for example: QString name="Name" the question is: How can I put this name variable into a combobox? I've read the Qt 4.6.2 docs but still cant figure out how to do that. Please dont refer me back to that Qt 4.6.2 docs again.. Please help me ASAP!! this is really urgent! thank you very much!! :)

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  • C++, Qt - How do I get rid of dll dependencies?

    - by HardCoder1986
    Hello! I have compiled my Qt application and now have the following question - now my built project requires QtCore4.dll and QtGui4.dll to be located at the same folder where the .exe file is. (I built my project using MSVS2008 with Qt addon) Q: Is there any way to combine my final application with these .dll files so that they make one large .exe-file? (I simply don't want to have another bunch of dll files with my release - app) Thank you.

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  • RubyQt Crashing on QTableWidget

    - by gja
    I'm getting some weirdness with QtRuby when using a TableWidget. The table widget loads, but when you click on the elements in the row, the app segfaults and crashes. require 'Qt4' class SimpleModel < Qt::AbstractTableModel def rowCount(parent) return 1 end def columnCount(parent) return 1 end def data(index, role=Qt::DisplayRole) return Qt::Variant.new("Really Long String") if index.row == 0 and index.column == 0 and role == Qt::DisplayRole return Qt::Variant.new end end Qt::Application.new(ARGV) do Qt::TableWidget.new(1, 1) do set_model SimpleModel.new show end exec end The backtrace seems to imply that it is bombing in mousePressEvent #6 0x01624643 in QAbstractItemView::pressed(QModelIndex const&) () from /usr/lib/libQtGui.so.4 #7 0x016306f5 in QAbstractItemView::mousePressEvent(QMouseEvent*) () from /usr/lib/libQtGui.so.4 If I override mousePressEvent and mouseMoveEvent, these kinds of crashes no longer happen. Am I doing something wrong over here, or can I chalk this up as a bug in QtRuby? I'm on fedora11, with the following packages installed: QtRuby-4.4.0-1.fc11.i586 ruby-1.8.6.369-1.fc11.i586 These crashes also happen when running the script on Windows.

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  • How can I position QDockWidgets as the screen shot shows using code?

    - by Nathan
    I want a Qt window to come up with the following arrangement of dock widgets on the right. Qt allows you to provide an argument to the addDockWidget method of QMainWindow to specify the position (top, bottom, left or right) but apparently not how two QDockWidgets placed on the same side will be arranged. Here is the code that adds the dock widgets. this uses PyQt4 but it should be the same for Qt with C++ self.memUseGraph = mem_use_widget(self) self.memUseDock = QDockWidget("Memory Usage") self.memUseDock.setObjectName("Memory Usage") self.memUseDock.setWidget(self.memUseGraph) self.addDockWidget(Qt.DockWidgetArea(Qt.RightDockWidgetArea),self.memUseDock) self.diskUsageGraph = disk_usage_widget(self) self.diskUsageDock = QDockWidget("Disk Usage") self.diskUsageDock.setObjectName("Disk Usage") self.diskUsageDock.setWidget(self.diskUsageGraph) self.addDockWidget(Qt.DockWidgetArea(Qt.RightDockWidgetArea),self.diskUsageDock) When this code is used to add both of them to the right side, one is above the other, not like the screen shot I made. The way I made that shot was to drag them there with the mouse after starting the program, but I need it to start that way.

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  • How do you add a certificate for WLAN in Linux, at the command-line?

    - by Neil
    I'm using Maemo on a Nokia n810 Internet tablet, and when given a list of installed certificates to choose from when connecting to a PEAP wireless network, it's always blank. I've already installed a couple of certificates through the gui on the device, and only the certificate authorities show up. I've confirmed that Maemo's connection software that handles certificates is buggy, in such a way that certificates are never added, or properly added certificates cannot be found. Is there a way to add WLAN certificates at the command-line, and connect to a wireless network at the command-line as well? I used to use iwconfig to connect, but I never used it with PEAP. Note: I have nothing in /etc/ssl/certs

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  • How do you add a certificate for WLAN in Linux, at the command-line?

    - by Neil
    I'm using Maemo on a Nokia n810 Internet tablet, and when given a list of installed certificates to choose from when connecting to a PEAP wireless network, it's always blank. I've already installed a couple of certificates through the gui on the device, and only the certificate authorities show up. I've confirmed that Maemo's connection software that handles certificates is buggy, in such a way that certificates are never added, or properly added certificates cannot be found. Is there a way to add WLAN certificates at the command-line, and connect to a wireless network at the command-line as well? I used to use iwconfig to connect, but I never used it with PEAP. Note: I have nothing in /etc/ssl/certs

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  • IPTV World Forum : vingt décodeurs TV fondés sur Qt illustrent les différentes facettes du framework (déclaratif, Web, widgets)

    Aujourd'hui se tient l'un des plus grands événements sur la télévision, l'IPTV World Forum, où un total de vingt sociétés exposent leurs décodeurs basés sur Qt (STB, pour Set-Top Box). Qt y est mis à l'oeuvre à toutes les sauces : de plus en plus de fabricants prévoient d'utiliser Qt Quick pour préparer des interfaces innovantes ; d'un autre côté, les télécoms et opérateurs de télévision numériques préfèrent les interfaces HTML5 avec Qt WebKit (cela sans compter ceux qui utilisent les interfaces plus classiques en C++). Trois ans auparavant, les sociétés utilisant Qt étaient rares à ce forum ; aujourd'hui, il est dur d'en trouver ne l'utilisant pas. On va passer en revue quelques utilisateurs de Qt. htt...

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  • Sortie de Qt 4.8.1 : corrections de bogues et support commercial de plusieurs RTOS au menu

    Sortie de Qt 4.8.1 : de nombreuses corrections de bugs Mise à jour du 29/03/2012 par gbdivers [IMG]http://ftp-developpez.com/gordon-fowler/Qt%20logo.png[/IMG] Quelques mois après la sortie de Qt 4.8, voici la première mise à jour avec la sortie de Qt 4.8.1. Cette version apporte principalement des corrections de bugs et plus de 200 améliorations fonctionnelles. Digia, responsable du support commercial de Qt, a fait un travail majeur dans la correction des bugs en proposant un grand nombre de corrections. La version 1.2.1 du Qt SDK devrait être mis à jour également dans les semaines prochaines pour intégrer cette nouvelle version du framework. Vous pouvez télécharger...

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  • Qt 4.x: how to implement drag-and-drop onto the desktop or into a folder?

    - by Jeremy Friesner
    Hi all, I've written a little file-transfer application written in C++ using Qt 4.x ... it logs into a server, shows the user a list of files available on the server, and lets the user upload or download files. This all works fine; you can even drag a file in from the desktop (or from an open folder), and when you drop the file icon into the server-files-list-view, the dropped file gets uploaded to the server. Now I have a request for the opposite action as well... my users would like to be able to drag a file out of the server-files-list-view and onto the desktop, or into an open folder window, and have that file get downloaded into that location. That seems like a reasonable request, but I don't know how to implement it. Is there a way for a Qt application to find out the directory corresponding to where "drop event" occurred, when the icon was dropped onto the desktop or into an open folder window? Ideally this would be a Qt-based platform-neutral mechanism, but if that doesn't exist, then platform-specific mechanisms for MacOS/X and Windows (XP or higher) would suffice. Any ideas?

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  • How do I add a header with data to a QTableWidget in Qt?

    - by San Jacinto
    Hi, I'm still learning Qt and I am indebted to the SO community for providing me with great, very timely answers to my Qt questions. Thank you. I'm quite confused on the idea of adding a header to a QTableWidget. What I'd like to do is have a table that contains information about team members. Each row for a member should contain his first and last name, each in its own cell, an email address in one cell, and office in the other cell. I'd to have a header above these columns to name them as appropriate. I'm trying to start off easy and get just the header to display "Last" (as in last name). Here is my code. int column = m_ui-teamTableWidget-columnCount(); m_ui-teamTableWidget-setColumnCount(column+1); QString* qq = new QString("Last"); m_ui-teamTableWidget-horizontalHeader()-model()-setHeaderData(0, Qt::Horizontal, QVariant(QVariant::String, &qq)); My table gets rendered corretly, but the header doesn't contain what I would expect. It contains 1 cell that contains the text "1". I am obviously doing something very silly here that is wrong, but i am lost. I keep pouring over the documentation, finding nothing. Here are the documentation links to the function calls I am making for the very last line. http://doc.trolltech.com/4.5/qtableview.html#horizontalHeader http://doc.trolltech.com/4.5/qabstractitemview.html#model http://doc.trolltech.com/4.5/qabstractitemmodel.html#setHeaderData Thanks for any and all help. Edit: HOW I SOLVED THE PROBLEM Using some help from the accepted answer, I came up with the following code: m_ui-teamTableWidget-setColumnCount(m_ui-teamTableWidget-columnCount()+1); QTableWidgetItem* qtwi = new QTableWidgetItem(QString("Last"),QTableWidgetItem::Type); m_ui-teamTableWidget-setHorizontalHeaderItem(0,qtwi);

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  • Qt Socket blocking functions required to run in QThread where created. Any way past this?

    - by Alexander Kondratskiy
    The title is very cryptic, so here goes! I am writing a client that behaves in a very synchronous manner. Due to the design of the protocol and the server, everything has to happen sequentially (send request, wait for reply, service reply etc.), so I am using blocking sockets. Here is where Qt comes in. In my application I have a GUI thread, a command processing thread and a scripting engine thread. I create the QTcpSocket in the command processing thread, as part of my Client class. The Client class has various methods that boil down to writing to the socket, reading back a specific number of bytes, and returning a result. The problem comes when I try to directly call Client methods from the scripting engine thread. The Qt sockets randomly time out and when using a debug build of Qt, I get these warnings: QSocketNotifier: socket notifiers cannot be enabled from another thread QSocketNotifier: socket notifiers cannot be disabled from another thread Anytime I call these methods from the command processing thread (where Client was created), I do not get these problems. To simply phrase the situation: Calling blocking functions of QAbstractSocket, like waitForReadyRead(), from a thread other than the one where the socket was created (dynamically allocated), causes random behaviour and debug asserts/warnings. Anyone else experienced this? Ways around it? Thanks in advance.

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  • Is there a way to receive data as unsigned char over UDP on Qt?

    - by user269037
    I need to send floating point numbers using a UDP connection to a Qt application. Now in Qt the only function available is qint64 readDatagram ( char * data, qint64 maxSize, QHostAddress * address = 0, quint16 * port = 0 ) which accepts data in the form of signed character buffer. I can convert my float into a string and send it but it will obviously not be very efficient converting a 4 byte float into a much longer sized character buffer. I got hold of these 2 functions to convert a 4 byte float into an unsinged 32 bit integer to transfer over network which works fine for a simple C++ UDP program but for Qt I need to receive the data as unsigned char. Is it possible to avoid converting the floatinf point data into a string and then sending it? uint32_t htonf(float f) { uint32_t p; uint32_t sign; if (f < 0) { sign = 1; f = -f; } else { sign = 0; } p = ((((uint32_t)f)&0x7fff)<<16) | (sign<<31); // Whole part and sign. p |= (uint32_t)(((f - (int)f) * 65536.0f))&0xffff; // Fraction. return p; } float ntohf(uint32_t p) { float f = ((p>>16)&0x7fff); // Whole part. f += (p&0xffff) / 65536.0f; // Fraction. if (((p>>31)&0x1) == 0x1) { f = -f; } // Sign bit set. return f; }

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  • Touch support in Qt 4.7

    <b>The H Open:</b> "Almost two months after the technical preview was released, the development of version 4.7 of the cross-platform Qt C++ framework for GUI applications is beginning to take shape, as Nokia has now presented a beta version."

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  • Qt Creator 2.5 est sorti en beta, l'EDI supporte plus de fonctionnalités de C++11

    Suite à la sortie de Qt Creator 2.5 en beta, il est grand temps de faire le tour de quelques nouveautés, sans toutes les passer en revue. C++11 Publié en septembre dernier, le standard ISO C++11 se doit d'avoir un meilleur support dans l'EDI ; notamment, on trouvera les mots-clés nullptr, constexpr, static_assert, noexcept et auto, ainsi que les espaces de noms en ligne et les lambdas (partiellement). De même, quelques nouvelles actions de refactorisation sont disponibles : insertion d'un #include pour les identifiants indéfinis, extraction de fonction, réarrangement de liste de paramètres, synchronisa...

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  • Workshops tackle Qt, Linux, and i.MX development

    <b>LinuxDevices:</b> "Future Electronics and Nokia will host six full-day, hands-on workshops across the North America on using Linux and Nokia's Qt development framework to develop user interfaces (UIs) for Freescale's ARM-based i.MX system-on-chips (SoCs)."

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  • La traduction dynamique des applications basées sur Qt

    Permettre la traduction facile des interfaces utilisateur est l'un des points forts de Qt. Le support de l'unicode dès les fondations et une infrastructure pour l'internationalisation permettent de travailler facilement dans un environnement internationalisé. Un article de Johan Thelin traduit par Guillaume Belz.

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  • Change compilation flags in Qt under Mac OS X?

    - by Lior
    I installed Qt for Mac, and am compiling my Qt project after adding in the .Pro file CONFIG(release, debug|release):QMAKE_CXXFLAGS += -O3 -fomit-frame-pointer to optimize for speed. However, I always see that the command where g++ is ran, includes -Os, which optimizes for size. I would like to remove it. I tried several approaches, like CONFIG(release, debug|release):QMAKE_CFLAGS_RELEASE -= -Os CONFIG(release, debug|release):QMAKE_CXXFLAGS -= -Os and CONFIG(release, debug|release):QMAKE_CXXFLAGS = -O3 -fomit-frame-pointer CONFIG(release, debug|release):QMAKE_CFLAGS_RELEASE = -O3 -fomit-frame-pointer (no +) But nothing. -Os ALWAYS appear. How do I change this? I found the qmake.conf file under /usr/local/QT4.5/mkspecs. It includes a mac-g++.conf file, but I cannot change it, and chmod doesn't work: chmod: mac-g++.conf: Operation not permitted Any ideas?

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  • What is the fastest way to display an image in QT on X11 without OpenGL?

    - by msh
    I need to display a raw image in a QT widget. I'm running X11 on a framebuffer, so OpenGL is not available. Both the image and the framebuffer are in the same format - RGB565, but I can change it to any other format if needed. I don't need blending or scaling. I just need to display pixels as is. I'm using QPainter::drawImage, but it converts QImage to QPixmap and this conversion seems to be very slow. Also it is backed by Xrender and I think there is unnecessary overhead required to support blending in Xrender which I don't really need Is there any better way? If it is not available in QT, I can use Xlib or any other library or protocol. I can modify the driver, X server or anything else.

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