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  • Qt Sockets and Endianness

    - by cake
    Hello I'm writing a program that uses QUdpSocket for transmiting data over the network. This is my first socket program, and I've come across an interesting problem called Endianness. My actual question in, do I have to worry about Endianness when I'm using QNetwork as my sockets library? If I do have to worry, what do I have to do to properly avoid Endianness problems? Thanks in advance.

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  • Qt undocumented method setSharable

    - by soxs060389
    I stumbled about a method which seems to be present in all DataObjects like QList, QQueue, QHash... I even investigated so far i can see the source code of it, which is inline void setSharable(bool sharable) { if (!sharable) detach(); d->sharable = sharable; } in qlist.h (lines 117) but what effect does it have on the QList, QQueue, QHash... ? And is it in any way related to threading? (which sounds reasonable) Thanks for any answer, and please only answer if you got actual knowledge.

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  • How to get the application font color in Qt

    - by Solitaire
    Hi, I want to put some text on my UI, I am drawing the text in paint event of a widget using painter.. Here is the sample code, which shows how I am drawing the text.. QWidget::paintEvent(painter); QPainter paint(this); paint.drawText(QPoint(10,30),"Duplex"); but, the text color is looks like the default theme color, how to set the application font color to the text in paint event.. Thanks

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  • Help Qt Widgets for creating Accessories Bar on my device

    - by Surjya Narayana Padhi
    Hi Geeks, For a handheld device I want to put a vertical Bar which will contain widgets that show the battery status of device, network connectivity status, Date and Time etc. For this Bar I have chosen a GroupBox and for the widgets inside that (lets say batter status) I am planning to use QPushButton. Is it correct I am doing or there is some special widgets for this purpose? Please suggest.

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  • qt drop event get widget

    - by eyecreate
    I'm trying to, inside a dropevent method, find out which widget was just dropped. I tried looking at the docs, but they only have commands for images and text. How do I access both the item just dropped and which widget it was dropped on?(this is drag and drop inside of a QTreeWidget)

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  • Qt - no such signal error

    - by bullettime
    I'm trying to trigger a signal when a double click happens in one of the draggable widgets on the fridge magnets example. Here's the changes I made to the example source: DragLabel: class DragLabel : public QLabel { public: DragLabel(const QString &text, QWidget *parent); QString labelText() const; public slots: void testSlot(){qDebug()<<"testSlot";} //<-- implemented this slot protected: void mouseDoubleClickEvent(QMouseEvent *ev){emit testSignal();} //<-- overriden this method private: QString m_labelText; signals: void testSignal(); //<-- added this signal }; The only thing I changed in the implementation file is adding connect(this,SIGNAL(testSignal()),this,SLOT(testSlot())); to DragLabel's constructor. Trying to compile the project resulted in 'undefined reference to `DragLabel::testSignal()' and 'collect2: ld returned 1 exit status' errors. When I comment out the call to the signal, it compiles and runs, but gives off 'Object::connect: No such signal QLabel::testSignal() in draglabel.cpp' warning in the application output. Apparently testSignal() isn't being recognized as a signal. What am I missing?

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  • Qt - Calling widget parent's slots

    - by bullettime
    I wrote a small program to test accessing a widget parent's slot. Basically, it has two classes: Widget: namespace Ui { class Widget; } class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = 0); ~Widget(); QLabel *newlabel; QString foo; public slots: void changeLabel(); private: Ui::Widget *ui; }; Widget::Widget(QWidget *parent) : QWidget(parent), ui(new Ui::Widget) { ui->setupUi(this); customWidget *cwidget = new customWidget(); newlabel = new QLabel("text"); foo = "hello world"; this->ui->formLayout->addWidget(newlabel); this->ui->formLayout->addWidget(cwidget); connect(this->ui->pushButton,SIGNAL(clicked()),cwidget,SLOT(callParentSlot())); connect(this->ui->pb,SIGNAL(clicked()),this,SLOT(changeLabel())); } void Widget::changeLabel(){ newlabel->setText(this->foo); } and customWidget: class customWidget : public QWidget { Q_OBJECT public: customWidget(); QPushButton *customPB; public slots: void callParentSlot(); }; customWidget::customWidget() { customPB = new QPushButton("customPB"); QHBoxLayout *hboxl = new QHBoxLayout(); hboxl->addWidget(customPB); this->setLayout(hboxl); connect(this->customPB,SIGNAL(clicked()),this,SLOT(callParentSlot())); } void customWidget::callParentSlot(){ ((Widget*)this->parentWidget())->changeLabel(); } in the main function, I simply created an instance of Widget, and called show() on it. This Widget instance has a label, a QString, an instance of customWidget class, and two buttons (inside the ui class, pushButton and pb). One of the buttons calls a slot in its own class called changeLabel(), that, as the name suggests, changes the label to whatever is set in the QString contained in it. I made that just to check that changeLabel() worked. This button is working fine. The other button calls a slot in the customWidget instance, named callParentSlot(), that in turn tries to call the changeLabel() slot in its parent. Since in this case I know that its parent is in fact an instance of Widget, I cast the return value of parentWidget() to Widget*. This button crashes the program. I made a button within customWidget to try to call customWidget's parent slot as well, but it also crashes the program. I followed what was on this question. What am I missing?

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  • How to get the selectionchange event in Qt

    - by Solitaire
    Hi.. I have a class inherited from Qwidget, now in that class I will be creating "Qlistview" object and filling up the items to view.. When the selection of items in the listview gets changed I want to get the "selectionchange" event to come.. So how can I achieve this.. pls tell me in brief... thanks

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  • kill process without knowing the full path using QT

    - by kaycee
    i'm trying to retrieve the active processes on my computer and to search for specific one, if it exists then i should kill it. is it possible to do it without knowing the specific path of the execute ? i know the execute process name but not the full path. so in short: 1. get all active processes 2. kill specific process thanks !

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  • how to convert unicode to printable string in QT stream

    - by user63898
    I'm writing a stream to a file and stdout, but I'm getting some kind of encoding like this: \u05ea\u05e7\u05dc\u05d9\u05d8 \u05e9\u05e1\u05d9\u05de\u05dc \u05e9\u05d9\u05e0\u05d5\u05d9 \u05d1\u05e1\u05d2\u05e0\u05d5\u05df \u05dc\u05d3\u05e2\u05ea\u05d9 \u05d0\u05dd \u05d0\u05e0\u05d9 \u05d6\u05d5\u05db\u05e8 \u05e0\u05db\u05d5\u05df How can I convert this to a printable string?

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  • My listview is not gaining the keyboard focus in Qt

    - by Solitaire
    Hi, i am trying to operate the listview itesm through keyboard focus, its not moving.. can you folks suggest where i am wrong. if i click on the listview from mouse, listview is gaining the focus. i dont no what is wrong. #include <QtGui> #include <QApplication> class Newlist : public QListView { public: Newlist(QWidget *parent = 0); ~Newlist(){}; public: QListView *list; QStringListModel *model; }; Newlist::Newlist(QWidget *parent) : QListView(parent) { list = new QListView(this); list->setViewMode(QListView::ListMode); list->setSelectionMode(QAbstractItemView::SingleSelection); list->setMinimumSize(300,500); model = new QStringListModel(this); QStringList strlist; strlist<<"Test"<<"fest"<<"mest"; list->setModel(model); model->setStringList(strlist); QModelIndex index = model->index(1,0); list->setCurrentIndex(index); QVBoxLayout *layout = new QVBoxLayout(this); layout->addWidget(list); setLayout(layout); list->setFocus(); } class Test : public QMainWindow { public: Test(QWidget *parent = 0); ~Test(){}; private: Mylistview *newlist; QVBoxLayout *layout; }; Test::Test(QWidget *parent) : QMainWindow(parent) { layout = new QVBoxLayout(); newlist = new Mylistview(); this->setCentralWidget(newlist); } int main(int argc, char *argv[]) { QApplication a(argc, argv); Test test; test.showMaximized(); return a.exec(); } Thanks in advance

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  • Qt - reading from a text file

    - by user289175
    Hello world, I have a table view with three columns; I have just passed to write into text file using this code QFile file("/home/hamad/lesson11.txt"); if(!file.open(QIODevice::WriteOnly)) { QMessageBox::information(0,"error",file.errorString()); } QString dd; for(int row=0; row < model->rowCount(); row++) { dd = model->item(row,0)->text() + "," + model->item(row,1)->text() + "," + model->item(row,2)->text(); QTextStream out(&file); out << dd << endl; } But I'm not succeed to read the same file again, I tried this code but I don't know where is the problem in it QFile file("/home/hamad/lesson11.txt"); QTextStream in(&file); QString line = in.readLine(); while(!in.atEnd()) { QStringList fields = line.split(","); model->appendRow(fields); } Any help please ?

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  • Qt Qbrush issue

    - by Solitaire
    What is the difference in the following code, QGraphicsScene * scence = new QGraphicsScene(); QBrush *brush = new QBrush((QColor(60,20,20))); scence->setBackgroundBrush(*brush); QGraphicsView *view = new QGraphicsView(); view->setScene(scence); //view->setBackgroundBrush(*brush); //view->setCacheMode(QGraphicsView::CacheBackground); view->showFullScreen(); gives black color background QGraphicsScene * scence = new QGraphicsScene(); QBrush *brush = new QBrush(); brush->setColor(QColor(60,20,20)); scence->setBackgroundBrush(*brush); QGraphicsView *view = new QGraphicsView(); view->setScene(scence); //view->setBackgroundBrush(*brush); //view->setCacheMode(QGraphicsView::CacheBackground); view->showFullScreen(); it gives nothing.

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  • Qt double click check left button mouse

    - by Alex Ivasyuv
    I need to run slot only on doubleClick with left button mouse, instead of both. connect(this -> myComponent, SIGNAL (doubleClicked (const QModelIndex & )), this, SLOT (performSomeAction(const QModelIndex & ))); With this event, double click works in both cases, but needed only with left button click. How I can do it? this - myComponent = QTableView

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  • Qt QTableView and horizontalHeader()->restoreState()

    - by cheez
    I can't narrow down this bug, however I seem to have the following problem: - saveState() of a horizontalHeader() - restart app - Modify model so that it has one less column - restoreState() - Now, for some reason, the state of the headerview is totally messed up. I cannot show or hide any new columns, nor can I ever get a reasonable state back I know, this is not very descriptive but I'm hoping others have had this problem before.

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