General and Desktop

@Vijaykarthikeyan said in Opencv video writing: @SGaist So I have to release the video variable after changing the state recording status to false..isn't it? You have to release them after the thread has stopped writing to the file. So it should rather be: Request recording to stop Emit recording has stopped when done Cleanup in response to that signal

@silvio Show the code please. Any chance that the ui file is not used at all or the project overwrites the ui file layout by setting a new one using the widget's code?!

@JackKuo class ResizableWidget : public QWidget { public: ResizableWidget(QWidget *parent = nullptr) : QWidget(parent), resizing(false) {} protected: void mousePressEvent(QMouseEvent *event) override { if (event->button() == Qt::LeftButton) { resizing = true; lastPos = event->globalPos(); } } void mouseMoveEvent(QMouseEvent *event) override { if (resizing) { int deltaX = event->globalX() - lastPos.x(); int deltaY = event->globalY() - lastPos.y(); resize(width() + deltaX, height() + deltaY); lastPos = event->globalPos(); } } void mouseReleaseEvent(QMouseEvent *event) override { Q_UNUSED(event); resizing = false; } void paintEvent(QPaintEvent *event) override { Q_UNUSED(event); QPainter painter(this); painter.fillRect(rect(), Qt::blue); } private: bool resizing; QPoint lastPos; };

@jsulm I have solved this problem. Firstly, I use Qt vs tools to import my project but I have taken another error. It says "msvc-version.conf loaded but QMAKE_MSC_VER isn't set". Than I open msvc_version.conf file in wordpad to give a version. In this file, it says which version you should use for your visual studio version. I have done this to. After that, I just add my lib files and other environments.

@Srinath_S To summarize: This thread says "How to synchronize files from linux to windows". The answer is: With rsync, mutagen, scp, samba or any similar tool. The actual intention is to implement a remote file browser. That's way more complex, Dolphin can be an aspiration.

@JonB I understand it. thank you so much. :)

ok issue was resolved in https://forums.gentoo.org/viewtopic-p-8807781.html#8807781

@Stephan-Lorenzen I don't claim to understand entirely, and I have not even used a QCompleter, but in 2009(!) https://stackoverflow.com/questions/1927289/how-to-update-qcompleters-model-dynamically said It seems that the model should be set before QLineEdit emits textChanged signal. One way is to reimplement keyPressEvent, but it involves many conditions to get QLineEdit's text. and the OP claimed to answer his own question with Oh, I have found the answer: Use signal textEdited instead of textChanged. Debuging QT's source code told me the answer. Does this help any?

@Christian-Ehrlicher Let m_widget show() when initialize fix it. top level widget seems neet time to show at first time.

@nintyfan said in Creating widgets in "another" thread...: Signal is not solution, because QApplication::exec could not been called yet So how do you show the push button then? Your design looks flawed.

@yato said in QSqlError("", "Driver not loaded", "Driver not loaded"): alguém poderia me ajudar com esse problema? sempre recebo essa mensagem no output The Qt PostgreSQL plugin is present but cannot load. This is probably because the PostgreSQL runtime libraries (DLLs) are not installed, or not in the same location as your program executable or on the system PATH.

@Pl45m4 - Thank you for your spot-on response. I now see that the first QSizePolicy is for horizontal (width) and the second one is for the vertical (height), all of which is clearly laid out in the help files, QSpacerItem::QSpacerItem(int w, int h, QSizePolicy::Policy hPolicy = QSizePolicy::Minimum, QSizePolicy::Policy vPolicy = QSizePolicy::Minimum) stuff I was too blind to see last night =) Thank you for your help.

@ChrisW67 The cert was ok. The problem was in configuration function see hereunder: was httpServer.sslSetup(sslCertificateChain.front(), QSslKey(&privateKeyFile, QSsl::RSA ), QSsl::TlsV1_0OrLater); working config. httpServer.sslSetup(sslCertificateChain.front(), QSslKey(&privateKeyFile, QSsl::Ec, ), QSsl::TlsV1_0OrLater); So I alter QSsl:RSA to QSsl::Ec - this thanks to Let's Encrypt community forum.

Came up with the following hack to identify when a delegate QComboBox gets focus: auto app = static_cast<QApplication *>(QApplication::instance()); connect(app, &QApplication::focusChanged, [=](QWidget *old, QWidget *now) { auto newTypeStr = now->metaObject()->className(); auto isComboBox = QString{newTypeStr} == QString{"QComboBoxListView"}; if (now && !this->isAncestorOf(now) && !isComboBox) { clearSelection(); } }); This works for my purposes but there's probably a less hacky way to do this.

@JacobNovitsky L in C++ code has nothing to do with L in pro files. LIBS variable specifies the arguments passed to the linker invocation. The -L parameter specifies a directory to look for linked libraries and -l specifies a library name to look for in that directory, so a line like LIBS += -LSomeDir/SomeSubdir/ -lsome means "Look for library libsome in directory SomeDir/SomeSubdir/ and link it". See your linker documentation for more detailed explanation e.g. this one for the gnu linker.

@ChrisW67 wow，thank you very much. "qtHaveModule() and qtConfig() are defined in .../mkspecs/features/qt_functions.prf." this helps me so much. emm ,thank you for spending time on me again.

Ok I found the problem. It turns out that there is a library libmodbus-5.dl.a which is strangely located in the /bin directory . So I added this directory /bin in the PATH, and now it works fine. Thank you very much for your help SGaist !