Qt 6

@nicker-player

#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include <QState> #include <QStateMachine> #include <QFinalState> QT_BEGIN_NAMESPACE namespace Ui { class MainWindow; } QT_END_NAMESPACE class MainWindow : public QMainWindow { Q_OBJECT public: MainWindow(QWidget *parent = nullptr); ~MainWindow(); signals: //this signals may be emit by buttons click, keys events,wheel events, slider move. void sigPageGoStart(); void sigPageGoMid(); void sigPageGoEnd(); void sigPageClose();//this signal emit when close current page,machine will finsh private slots: //Here I only add the button trigger emit state Transition procedure void on_pushButton1_First_clicked(); void on_pushButton_Prev_clicked(); void on_pushButton_Next_clicked(); void on_pushButton_Last_clicked(); void slotPageFinishedState(); private: Ui::MainWindow *ui; QStateMachine* pageStateMachine=new QStateMachine(this); QState* pageStartState=nullptr; QState* pageMiddleState=nullptr; QState* pageEndState=nullptr; QFinalState* pageNoneState=nullptr; void OpenPage(); void ClosePage(); }; #endif // MAINWINDOW_H #include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent) , ui(new Ui::MainWindow) { ui->setupUi(this); //1-create state pageStartState=new QState(pageStateMachine); pageStartState->assignProperty(ui->pushButton1_First,"enabled",false); pageStartState->assignProperty(ui->pushButton_Prev,"enabled",false); pageStartState->assignProperty(ui->pushButton_Next,"enabled",true); pageStartState->assignProperty(ui->pushButton_Last,"enabled",true); pageMiddleState=new QState(pageStateMachine); pageMiddleState->assignProperty(ui->pushButton1_First,"enabled",true); pageMiddleState->assignProperty(ui->pushButton_Prev,"enabled",true); pageMiddleState->assignProperty(ui->pushButton_Next,"enabled",true); pageMiddleState->assignProperty(ui->pushButton_Last,"enabled",true); pageEndState=new QState(pageStateMachine); pageEndState->assignProperty(ui->pushButton1_First,"enabled",true); pageEndState->assignProperty(ui->pushButton_Prev,"enabled",true); pageEndState->assignProperty(ui->pushButton_Next,"enabled",false); pageEndState->assignProperty(ui->pushButton_Last,"enabled",false); pageNoneState=new QFinalState(pageStateMachine); connect(pageStateMachine,&QStateMachine::stopped,this,&MainWindow::slotPageFinishedState); //2-add state transition pageStartState->addTransition(this,&MainWindow::sigPageGoMid,pageMiddleState); pageStartState->addTransition(this,&MainWindow::sigPageGoEnd,pageEndState); pageStartState->addTransition(this,&MainWindow::sigPageClose,pageNoneState); pageMiddleState->addTransition(this,&MainWindow::sigPageGoStart,pageStartState); pageMiddleState->addTransition(this,&MainWindow::sigPageGoEnd,pageEndState); pageMiddleState->addTransition(this,&MainWindow::sigPageClose,pageNoneState); pageEndState->addTransition(this,&MainWindow::sigPageGoMid,pageMiddleState); pageEndState->addTransition(this,&MainWindow::sigPageGoStart,pageStartState); pageEndState->addTransition(this,&MainWindow::sigPageClose,pageNoneState); //3- open Page OpenPage(); } MainWindow::~MainWindow() { delete ui; } void MainWindow::on_pushButton1_First_clicked() { //page move to start page view emit sigPageGoStart(); } void MainWindow::on_pushButton_Prev_clicked() { //page move up //Check page view position, send signal sigPageGoStart\sigPageGoMid\sigPageGoEnd } void MainWindow::on_pushButton_Next_clicked() { //page move down //Check page view position, send signal sigPageGoStart\sigPageGoMid\sigPageGoEnd } void MainWindow::on_pushButton_Last_clicked() { //page move to start page view emit sigPageGoEnd(); } void MainWindow::slotPageFinishedState() { ui->pushButton1_First->setEnabled(false); ui->pushButton_Prev->setEnabled(false); ui->pushButton_Next->setEnabled(false); ui->pushButton_Last->setEnabled(false); } void MainWindow::OpenPage() { //1-open page move to start page view //2-set ui machine pageStateMachine->setInitialState(pageStartState); pageStateMachine->start(); } void MainWindow::ClosePage() { //1-close page //2-stop ui machine emit sigPageClose(); }

start your program through a script (.bat file) which will set up all paths and environment variables if this is about third party libraries, you can load your app first, then set env using qputenv, then load your libs using QLibrary install libraries system-wide so that all apps will have access to them regardless of where they are compile your app statically to include all code inside create a launcher for your app which will set up QProcessEnvironment and then launch your main app through QProcess

As you can see, there are many ways to solve this. Which solution is correct depends on particular details of your situation and your preference.

Yes, it works!
For test I send a videotestsrc via console:
gst-launch-1.0 videotestsrc ! "video/x-raw,width=640,height=480" ! x264enc ! mpegtsmux name=mux ! udpsink host=127.0.0.1 port=8080

In QML:

... MediaPlayer { id: player source: "udp://@127.0.0.1:8080" videoOutput: video } VideoOutput { id: video anchors.fill: parent fillMode: VideoOutput.PreserveAspectCrop } Component.onCompleted: { player.play() }

Hi,

If memory serves well, there has not been any major changes in the licenses. You can see changes related to licences here.

Dirty hack - create symlink ln --symbolic /usr/lib/qt6/libexec/moc /usr/libexec/moc
qmake work because it have symlink at /usr

$ ls -l /usr/bin/qmake* lrwxrwxrwx 1 root root 9 May 3 2019 /usr/bin/qmake -> qtchooser lrwxrwxrwx 1 root root 21 Jun 13 23:13 /usr/bin/qmake6 -> ../lib/qt6/bin/qmake6

Add below line in your CMakeLists.txt file :
find_package(Qt6 REQUIRED COMPONENTS Qml)
target_link_libraries(${myProject} PRIVATE Qt6::Qml)

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@appdev
If you have now written a minimal example which shows the problematic behaviour, as @SGaist asked you to, then obviously you should show that code....

@JonB thx. I input was wrong.

@cristian-adam
Thank you, I will make further Chan

From memory, no, MariaDB is a drop in replacement so it would not make sense to complicate the build system for that.

Then I would say my suggestion still applies.

@appdev said in [QSpin boxes and strange values]:

Why aren't they equal to 0 ?

Because as I said not all values are exactly representable in a computer double. In fact, to be exact the number which are exactly representable is an infinitely small subset of real numbers!

Forget about spin boxes for now.

Show your code which reads the numbers from CSV file.

Use something like QString QString::number(double n, char format = 'g', int precision = 6) to convert your numbers to strings for displaying/debugging purposes. See what happens if you play with the precision parameter to increase/decrease how many digits are output.

@JonB said in Mixing C and C++ in a Qt project. undefined reference to function():

project(MyProject C CXX)

This is not needed when you don't need a special language

project(MyProject)

is enough - cmake does know how to compile a .c or .cpp file .