General and Desktop

@Sociostar Any reason you're replied to me more or less repeating what I wrote?

@SOrton Not (so far as I know) in a Qt library. Use the std:: library for this sort of functionality (or write it yourself).

@agmar It would be better if you pasted some minimal example of your problematic code. But if you are going to post code as big as this please use the forum's Code tags around code blocks. Meanwhile, your MainWindow::sendMessage() at least has a local QSerialPort and opens and closes it. I don't know about the rest of your code, but you are supposed to have a single instance of QSerialPort permanently open for both writes & reads.

@praveen_1323 said in phonon::Mediaobject: video/widget.cpp:-1: error: undefined reference to `Phonon::VideoPlayer::VideoPlayer(Phonon::Category, QWidget*)' You're apparently not linking the library containing VideoPlayer. Please post the linker call and also check the compiler output for any messages like unsupported library. Why do you use Qt4?

@Chuck333 What is your exact problem/question?

@JonB thank you, i just missed the line in the terminal example... its the example available in the welcome page :-) just type out "terminal" in the search bar

@ChrisW67 Experienced. The code doesn't work. It does not transfer the string.

@Stewman-Phil have you found the method ? i have the same problem

@J-Hilk said in focus tracking: https://doc.qt.io/qt-6/qfocusevent.html Thank you, I have: bool clsXMLnode::eventFilter(QObject* pobjObject, QEvent* pobjEvent) { Q_ASSERT_X(pobjEvent!=nullptr, "clsXMLnode::eventFilter", "pobjEvent is null!"); QWidget* pobjWidget(qobject_cast<QWidget*>(pobjObject)); clsXMLnode* pobjWindow(pobjGetWindow()); clsXMLinterface* pobjXMLIF(nullptr); if ( pobjWindow != nullptr ) { pobjXMLIF = pobjWindow->pobjGetXMLIF(); } QEvent::Type evtType(pobjEvent->type()); QString strID; if ( pobjWidget != nullptr ) { strID = pobjWidget->accessibleName(); } if ( evtType == QEvent::FocusIn ) { if ( pobjXMLIF != nullptr ) { clsXMLnode* pobjNode(pobjXMLIF->pobjGetNode()); emit pobjNode->setWidgetInFocus(pobjWidget); } } else if ( evtType == QEvent::FocusOut ) { } else if ( evtType == QEvent::MouseMove ) { //HACK QMouseEvent* pobjMouse = qobject_cast<QMouseEvent*>(pobjEvent); //HACK QPoint ptPos = pobjMouse->pos(); //HACK qdbg() << "9" << clsDebugService::msccDebugLevelDelimiter << "" << "eventFilter(MouseMove):" << strGetAttribute(clsXMLnode::mscszAttrID) << ptPos.x() << ptPos.y() << "HACK!"; } else if ( evtType == QEvent::Move ) { QMoveEvent* pobjMove(reinterpret_cast<QMoveEvent*>(pobjEvent)); QPoint ptNew(pobjMove->pos()); if ( ptNew.x() >= 0 && ptNew.y() >= 0 && ptNew != mptLastMouse ) { mptLastMouse = ptNew; setAttribute(clsXMLnode::mscszAttrPoint ,QString::number(mptLastMouse.x()) + clsXMLnode::msccParamDelimiter + QString::number(mptLastMouse.y())); return false; } } else if ( evtType == QEvent::Resize ) { QResizeEvent* pobjResize(reinterpret_cast<QResizeEvent*>(pobjEvent)); QSize szNew(pobjResize->size()); if ( szNew.isValid() == true ) { setAttribute(clsXMLnode::mscszAttrResize, QString::number(szNew.width()) + clsXMLnode::msccParamDelimiter + QString::number(szNew.height())); return false; } } return QObject::eventFilter(pobjObject, pobjEvent); } Which I wrote a long time ago, will revisit and adapt. I must be getting old, because I've already done this: QObject::connect(this, &clsXMLnode::setWidgetInFocus ,this, &clsXMLnode::onSetWidgetInFocus);

Okay I trie it

@JKSH And hope that, e.g. code never passes it as a parameter... :)

@donkey007 What C++ compiler do you use and what C++ compilers are supported by rcpp? And again: this has nothing to do with Qt, you should consider to ask in a rcpp forum/mailing list and check rcpp documentation.

@AnneRanch I would suggest: Right click on your project Choose Qt Files and Classes template Choose Qt Designer Form Class Select Main Window This time, name it like you want it to Finish the wizard Delete old "MainWindow" from project

@Kent-Dorfman said in segfault "caused" by unused variable in different class: I detect a strong odor of pointer problems. i am getting random segfault at Class2::Print() , but most dont occur everytime. the one involving (m_vPointA.size() is the only one that occurred every time for two days lets go with pointer error. how to track it down?

in linux the "script" command entered in a terminal window will save all IO to the file "typescript". "exit" when done. Not that it saves in DOS endline format which is "<CR><LF>"

@bart_janssens said in Timer error when launching a new QGuiApplication after exit: Julia https://github.com/barche/QML.jl

@TGRSM Do not you need arguments to call execute? int QProcess::execute(const QString &program, const QStringList &arguments) https://doc.qt.io/qt-5.15/qprocess.html#execute The following one is run like QStringList arguments; arguments << "/c" << ""w:/scripts/myscript.bat"" int exitCode = QProcess::execute( "cmd", arguments );

@schrute: Style options are used for data exchange between widgets and styles. The widget populates it with data that each style may interpret differently when doing its drawing work. So in the case at hand, a custom style is supposed to react specifically to a custom widget. It’s a question of style (haha) whether to query the widget directly or derive from QStyleOption. Deriving from QStyleOption has the advantage that information can be detached at a specific state without being modified when the widget’s state transitions in the meanwhile. For instance if it should be drawn differently while being hovered, the widget may no longer know at the point of direct query, that it once was under the mouse cursor. That’s where I’d draw the line: If conserving fluctuating states is crucial, derive from QStyleOption. If that’s not the case, call the widget directly.

@Aviral-0 Hi, Unless I am mistaking, it's Qt Creator. Therefore take a look at Qt Creator's sources.

Hi, That part comes from KDE, I would recommend also checking with them.