General and Desktop

@JacobNovitsky Just follow the example in the documentation Project file. Only 2 lines added QT += core gui greaterThan(QT_MAJOR_VERSION, 4): QT += widgets CONFIG += c++17 # You can make your code fail to compile if it uses deprecated APIs. # In order to do so, uncomment the following line. #DEFINES += QT_DISABLE_DEPRECATED_BEFORE=0x060000 # disables all the APIs deprecated before Qt 6.0.0 CONFIG += precompile_header PRECOMPILED_HEADER = precompiled.h SOURCES += \ main.cpp \ widget.cpp HEADERS += \ widget.h # Default rules for deployment. qnx: target.path = /tmp/$${TARGET}/bin else: unix:!android: target.path = /opt/$${TARGET}/bin !isEmpty(target.path): INSTALLS += target Headers to be precompiled (precompiled.h): // Add C includes here // none in this example #if defined __cplusplus // Add stable C++ includes here #include <QApplication> #include <QPushButton> #include <QLabel> #include <QLineEdit> #endif And the unmodified code of the program: #ifndef WIDGET_H #define WIDGET_H #include <QWidget> class Widget : public QWidget { Q_OBJECT public: Widget(QWidget *parent = nullptr); ~Widget(); }; #endif // WIDGET_H #include "widget.h" #include <QLabel> #include <QPushButton> #include <QLineEdit> #include <QVBoxLayout> Widget::Widget(QWidget *parent) : QWidget(parent) { QVBoxLayout *layout = new QVBoxLayout(this); QLabel *label = new QLabel("Hello, world!"); QPushButton *button = new QPushButton("Hello, button!"); QLineEdit *edit = new QLineEdit("Hello, editor!"); layout->addWidget(label); layout->addWidget(button); layout->addWidget(edit); } Widget::~Widget() { } #include "widget.h" #include <QApplication> int main(int argc, char *argv[]) { QApplication a(argc, argv); Widget w; w.show(); return a.exec(); } Re-run qmake, build, and precompiling/using the headers will happen. Any header not in the precompiled set will be handled normally.

this is what worked for me class CalendarWidget(QtWidgets.QCalendarWidget): def __init__(self, parent=None): super(CalendarWidget, self).__init__(parent, verticalHeaderFormat=QtWidgets.QCalendarWidget.NoVerticalHeader, gridVisible=False) self.setObjectName("patient_visit_date_calendar_widget") prev_button = self.findChild(QtWidgets.QToolButton, "qt_calendar_prevmonth") next_button = self.findChild(QtWidgets.QToolButton, "qt_calendar_nextmonth") # Create QIcon instances for your icons prev_icon = QIcon(":resources/icons/arrow_back.svg") next_icon = QIcon(":resources/icons/arrow_forward.svg") # Set the icons to the buttons prev_button.setIcon(prev_icon) next_button.setIcon(next_icon) for btn in (prev_button, next_button): btn.setIconSize(QtCore.QSize(15, 15)) for d in (QtCore.Qt.Saturday, QtCore.Qt.Sunday,): fmt = self.weekdayTextFormat(d) fmt.setForeground(QtCore.Qt.darkGray) self.setWeekdayTextFormat(d, fmt) self.setStyleSheet(QSS) def paintCell(self, painter, rect, date): if date == self.selectedDate(): painter.save() painter.fillRect(rect, QtGui.QColor("white")) painter.setPen(QtCore.Qt.NoPen) painter.setBrush(QtGui.QColor(10, 186, 181, 100)) r = QtCore.QRect(QtCore.QPoint(), min(rect.width(), rect.height())*QtCore.QSize(1, 1)) r.moveCenter(rect.center()) painter.drawEllipse(r) painter.setPen(QtGui.QPen(QtGui.QColor("white"))) painter.drawText(rect, QtCore.Qt.AlignCenter, str(date.day())) painter.restore() else: super(CalendarWidget, self).paintCell(painter, rect, date)

Did you already start your application with the QT_DEBUG_PLUGINS environment set to one ?

Hi and welcome to devnet, It seems you are missing the libva package on your system. Also, which version of OpenSSL do you have installed ?

Creating a base widget that does that handling is the correct way. However you can't optimize more. Each of your widgets will have custom texts and that's normal so streamlining where the code should be is already a good gain.

@tomas-soltys "I think I need to get access to QSslSocket which can then further provide certificate details" Find QHttpServer source code. I mean QHttpServer.cpp and QHttpServer.h Modify the code so that you can get QSslSocket object. Then you can use: QSslCertificate QSslSocket::peerCertificate() const "Returns the peer's digital certificate (i.e., the immediate certificate of the host you are connected to), or a null certificate, if the peer has not assigned a certificate.". I have question to you: what version of Qt and openssl you use. Look at my post: maybe you can help me to get read of ssl connection issue . Link: https://forum.qt.io/topic/150462/qhttpserver-api-https-openssl-letsencrypt-sslv3-alert-handshake-failure-alert-number-40/6?_=1697291376846

@vladstelmahovsky said in QtMultimedia ffmpeg backend and Openssl library version mixup: @oniongarlic yes, I can confirm that ffmpeg backend cant playback rtsp streams. Not sure if its due to ssl library not found error My problem is with HLS streams, I get the first frame and then an error (ffplay works fine) (Windows, Mac) Linux won't even get that far with this ssl issue.

You can add custom functions to e.g. bulk-add data to the model but must not forget the call the appropriate changed signals. This is a common way of adding data since it's to slow through setData() when a lot of stuff is changing.

@MadBee I think you are confusing the UUID variant (DCE, the variant described in RFC 4122) with the UUID version (a sub-type of variant): The following table lists the currently-defined versions for this UUID variant. Msb0 Msb1 Msb2 Msb3 Version Description 0 0 0 1 1 The time-based version specified in this document. 0 0 1 0 2 DCE Security version, with embedded POSIX UIDs. 0 0 1 1 3 The name-based version specified in this document that uses MD5 hashing. 0 1 0 0 4 The randomly or pseudo- randomly generated version specified in this document. 0 1 0 1 5 The name-based version specified in this document that uses SHA-1 hashing. You get a version 4 (random) UUID by default QUuid::createUuid() but there are similar functions to create version 3 and 5 UUIDs. You can construct a QUuid object specifying all the components yourself to obtain a UUID of any variant or version.

Hi, Is that monitor a High-DPI monitor ? How do you determine the size of the LED widget ?

@Christian-Ehrlicher said in Strange memory allocation issues?: @Dariusz said in Strange memory allocation issues?: Any idea why converting QString to stdString causes memory allocation issues? I don't know what you're trying to achieve - if you want to look for memory leaks use the appropriate tools but those two functions don't leak any memory. /edit: and btw: there is more than one new operator: https://en.cppreference.com/w/cpp/memory/new/operator_new Meh no luck, added other ones but failed to track it :/ // 1. Simple allocation void *operator new(std::size_t size) { if (mRecordData) { allocations++; total++; void *p = std::malloc(size); if (!p) { badAllocs++; totalBadAllocs += size; throw std::bad_alloc(); } totalSizeAllocated += size; return p; } return std::malloc(size); } // 2. Array allocation void *operator new[](std::size_t size) { return ::operator new(size); } // 3. No-exception allocation void *operator new(std::size_t size, const std::nothrow_t &) noexcept { if (mRecordData) { allocations++; total++; void *p = std::malloc(size); if (!p) { badAllocs++; totalBadAllocs += size; } return p; } return std::malloc(size); } // 4. Array no-exception allocation void *operator new[](std::size_t size, const std::nothrow_t &nt) noexcept { return ::operator new(size, nt); } #if __cplusplus >= 201703L // 5. Aligned allocation (C++17 onward) void *operator new(std::size_t size, std::align_val_t al) { if (mRecordData) { allocations++; total++; void *p = _aligned_malloc(static_cast<size_t>(al), size); if (!p) { badAllocs++; totalBadAllocs += size; throw std::bad_alloc(); } totalSizeAllocated += size; return p; } return _aligned_malloc(static_cast<size_t>(al), size); } // 6. Aligned array allocation (C++17 onward) void *operator new[](std::size_t size, std::align_val_t al) { return ::operator new(size, al); } #endif // Corresponding delete overloads void operator delete(void *p) noexcept { if (mRecordData) { deallocations++; total--; } std::free(p); } void operator delete[](void *p) noexcept { ::operator delete(p); } void operator delete(void *p, const std::nothrow_t &) noexcept { ::operator delete(p); } void operator delete[](void *p, const std::nothrow_t &) noexcept { ::operator delete(p); } #if __cplusplus >= 201703L void operator delete(void *p, std::align_val_t) noexcept { ::operator delete(p); } void operator delete[](void *p, std::align_val_t) noexcept { ::operator delete(p); } #endif Bummer! Just wanted a lightweight way of tracking my test allocations/memory footpring :c I know there is valgrind/other ones, but they are harder to set up for per-function tests/etc inside gtest as far as I can tell :/

@Christian-Ehrlicher any hint?

@johnco3 I am not using a pull mode I don't believe. I am using a timer that fires every 20ms and writes more data as it becomes available. I'm sorry.

@SGaist this in indeed a very cool trick that works even better than I thought. I have added a custom property text2 that was set as the user property. This also means that I do not have to change the QDataWidgetMapper addMapping function, since that one requests the user property to begin with. Thank you very much for this sneaky/clever trick as @JonB points out :-)

@Redman For anyone wondering: Simply create a <ProjectName>.pro.shared file and copy parts to share into the newly created file. Whitelist it in the .gitignore if needed and you're good.