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Qt first project

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  • SGaistS Offline
    SGaistS Offline
    SGaist
    Lifetime Qt Champion
    wrote on last edited by
    #24

    Too little about what ? The key functions are explained in the presentation page and the rest is rather nicely written. So please be more specific about which part is giving you a hard time.

    Interested in AI ? www.idiap.ch
    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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    • N Offline
      N Offline
      nick784512
      wrote on last edited by
      #25

      What this http://doc.qt.io/qt-5/qtserialport-terminal-settingsdialog-cpp.html code does?
      From C language I know that we have to also call a function. Where are the functions called?

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      • SGaistS Offline
        SGaistS Offline
        SGaist
        Lifetime Qt Champion
        wrote on last edited by
        #26

        The dialog is shown when clicking on the configure button in main dialog.

        Then when you click on the connect button, the openSerialPort method will retrieve the current setting for the serial port and update the serial member variable properties with the settings from the dialog.

        Interested in AI ? www.idiap.ch
        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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        • N Offline
          N Offline
          nick784512
          wrote on last edited by nick784512
          #27

          Thank you. Now that I want to make the simple project as I said before. How many files do I need?

          mainwindow.h
          mainwindow.cpp
          main.cpp
          mainwindow.ui

          are all these enough?

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          0
          • SGaistS Offline
            SGaistS Offline
            SGaist
            Lifetime Qt Champion
            wrote on last edited by
            #28

            Based on your requirements, you only need a QWidget, a QPushButton and a QVBoxLayout to put the button nicely in the widget.

            Interested in AI ? www.idiap.ch
            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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            • N Offline
              N Offline
              nick784512
              wrote on last edited by
              #29

              But where will I put the code?

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              • SGaistS Offline
                SGaistS Offline
                SGaist
                Lifetime Qt Champion
                wrote on last edited by
                #30

                In your QWidget subclass.

                Interested in AI ? www.idiap.ch
                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                • N Offline
                  N Offline
                  nick784512
                  wrote on last edited by
                  #31

                  In main.cpp?

                  jsulmJ 1 Reply Last reply
                  0
                  • N nick784512

                    In main.cpp?

                    jsulmJ Offline
                    jsulmJ Offline
                    jsulm
                    Lifetime Qt Champion
                    wrote on last edited by
                    #32

                    @nick784512 I would suggest you to create a simple widgets application and play a bit with it. You will see how Qt widgets applications are usually implemented. See http://doc.qt.io/qtcreator/creator-writing-program.html
                    Asking others to send you an implementation is not really the right way to learn. Best is "learning by doing" and asking specific questions if you're stuck.

                    https://forum.qt.io/topic/113070/qt-code-of-conduct

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                    • N Offline
                      N Offline
                      nick784512
                      wrote on last edited by nick784512
                      #33

                      I have tried this one: https://www.youtube.com/watch?v=UD78xyKbrfk
                      and I connected the arduino to the COM3 with a program that sends 2 3 2 3... but the Qt program does not display the 2 3 2 3 ....

                      mrjjM 1 Reply Last reply
                      0
                      • N nick784512

                        I have tried this one: https://www.youtube.com/watch?v=UD78xyKbrfk
                        and I connected the arduino to the COM3 with a program that sends 2 3 2 3... but the Qt program does not display the 2 3 2 3 ....

                        mrjjM Offline
                        mrjjM Offline
                        mrjj
                        Lifetime Qt Champion
                        wrote on last edited by
                        #34

                        @nick784512
                        In that video, he mere set the text he gets to a QLabel
                        MainWindow::serialReceived .
                        If it should respond to anything you must program it yourself.

                        Please show what you changed it into to reply ? :)

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                        • N Offline
                          N Offline
                          nick784512
                          wrote on last edited by
                          #35

                          $$$$$$$$$$$$$$$serialGui.pro$$$$$$$$$$$$$$$$$$

                          #-------------------------------------------------

                          Project created by QtCreator 2016-12-06T15:42:10

                          #-------------------------------------------------

                          QT += core gui serialport

                          greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

                          TARGET = serialGui
                          TEMPLATE = app

                          SOURCES += main.cpp
                          mainwindow.cpp

                          HEADERS += mainwindow.h

                          FORMS += mainwindow.ui

                          $$$$$$$$$$$$$$$$$$mainwindow.h$$$$$$$$$$$$$$$$$$$$$$$$$

                          #ifndef MAINWINDOW_H
                          #define MAINWINDOW_H

                          #include <QMainWindow>

                          namespace Ui {
                          class MainWindow;
                          }

                          class MainWindow : public QMainWindow
                          {
                          Q_OBJECT

                          public:
                          explicit MainWindow(QWidget *parent = 0);
                          ~MainWindow();

                          private slots:
                          void serialReceived();

                          private:
                          Ui::MainWindow *ui;
                          };

                          #endif // MAINWINDOW_H

                          $$$$$$$$$$$$$$$$$$$$main.cpp$$$$$$$$$$$$$$$$$$$$$$$$$$$

                          #include "mainwindow.h"
                          #include <QApplication>

                          int main(int argc, char *argv[])
                          {
                          QApplication a(argc, argv);
                          MainWindow w;
                          w.show();

                          return a.exec();
                          

                          }

                          $$$$$$$$$$$$$$$$$$$mainwindow.cpp$$$$$$$$$$$$$$$$$$$$$$$

                          #include "mainwindow.h"
                          #include "ui_mainwindow.h"
                          #include <QtSerialPort>
                          #include <QDebug>

                          QSerialPort *serial;

                          MainWindow::MainWindow(QWidget *parent) :
                          QMainWindow(parent),
                          ui(new Ui::MainWindow)
                          {
                          ui->setupUi(this);
                          serial = new QSerialPort(this);
                          serial->setPortName("COM3");
                          serial->setBaudRate(QSerialPort::Baud9600);
                          serial->setDataBits(QSerialPort::Data8);
                          serial->setParity(QSerialPort::NoParity);
                          serial->setStopBits(QSerialPort::OneStop);
                          serial->setFlowControl(QSerialPort::NoFlowControl);
                          serial->open(QIODevice::ReadWrite);
                          serial->write("hello");
                          serial->close();
                          connect(serial,SIGNAL(readyRead()),this,SLOT(serialReceived()));
                          }

                          MainWindow::~MainWindow()
                          {
                          delete ui;
                          serial->close();
                          }

                          void MainWindow::serialReceived()
                          {
                          QByteArray ba;
                          ba=serial->readAll();
                          ui->label->setText(ba);
                          qDebug()<<ba;
                          }

                          $$$$$$$$$$$$$$$$mainwindow.ui$$$$$$$$$$$$$$$$$$$$$$$$$

                          <?xml version="1.0" encoding="UTF-8"?>
                          <ui version="4.0">
                          <class>MainWindow</class>
                          <widget class="QMainWindow" name="MainWindow">
                          <property name="geometry">
                          <rect>
                          <x>0</x>
                          <y>0</y>
                          <width>400</width>
                          <height>300</height>
                          </rect>
                          </property>
                          <property name="windowTitle">
                          <string>MainWindow</string>
                          </property>
                          <widget class="QWidget" name="centralWidget">
                          <widget class="QLabel" name="label">
                          <property name="geometry">
                          <rect>
                          <x>50</x>
                          <y>60</y>
                          <width>121</width>
                          <height>41</height>
                          </rect>
                          </property>
                          <property name="text">
                          <string>TextLabel</string>
                          </property>
                          </widget>
                          </widget>
                          <widget class="QMenuBar" name="menuBar">
                          <property name="geometry">
                          <rect>
                          <x>0</x>
                          <y>0</y>
                          <width>400</width>
                          <height>21</height>
                          </rect>
                          </property>
                          </widget>
                          <widget class="QToolBar" name="mainToolBar">
                          <attribute name="toolBarArea">
                          <enum>TopToolBarArea</enum>
                          </attribute>
                          <attribute name="toolBarBreak">
                          <bool>false</bool>
                          </attribute>
                          </widget>
                          <widget class="QStatusBar" name="statusBar"/>
                          </widget>
                          <layoutdefault spacing="6" margin="11"/>
                          <resources/>
                          <connections/>
                          </ui>

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                          • SGaistS Offline
                            SGaistS Offline
                            SGaist
                            Lifetime Qt Champion
                            wrote on last edited by
                            #36

                            Why are you closing your serial port in the constructor ? You won't receive anything doing so.

                            Interested in AI ? www.idiap.ch
                            Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                            N 1 Reply Last reply
                            1
                            • SGaistS SGaist

                              Why are you closing your serial port in the constructor ? You won't receive anything doing so.

                              N Offline
                              N Offline
                              nick784512
                              wrote on last edited by
                              #37

                              @SGaist

                              I disabled it. Again, nothing received.

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                              • SGaistS Offline
                                SGaistS Offline
                                SGaist
                                Lifetime Qt Champion
                                wrote on last edited by
                                #38

                                You also don't check whether open was successful.

                                You should rather move the call to write outside the constructor. e.g. in a slot connected to a push button.

                                And make serial a member of MainWindow.

                                Interested in AI ? www.idiap.ch
                                Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

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                                • N Offline
                                  N Offline
                                  nick784512
                                  wrote on last edited by
                                  #39

                                  Thank you! I cannot understand how the tutorial video in youtube works and the same configuration and coding in my project does not work.

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                                  • SGaistS Offline
                                    SGaistS Offline
                                    SGaist
                                    Lifetime Qt Champion
                                    wrote on last edited by
                                    #40

                                    Did you check that the settings of the serial ports are really what you need to use with your device ?

                                    Interested in AI ? www.idiap.ch
                                    Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                    N 1 Reply Last reply
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                                    • SGaistS SGaist

                                      Did you check that the settings of the serial ports are really what you need to use with your device ?

                                      N Offline
                                      N Offline
                                      nick784512
                                      wrote on last edited by
                                      #41

                                      @SGaist

                                      1)How do I check if the serial opened succefully?
                                      2)I disabled write.
                                      3)Do you mean to make it private member of MainWindow?

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                                      • SGaistS Offline
                                        SGaistS Offline
                                        SGaist
                                        Lifetime Qt Champion
                                        wrote on last edited by
                                        #42
                                        1. Please read the documentation, the open function returns a boolean value saying whether it succeeded or not
                                        2. Where did you put the call to write ?
                                        3. Yes

                                        Interested in AI ? www.idiap.ch
                                        Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

                                        N 1 Reply Last reply
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                                        • SGaistS SGaist
                                          1. Please read the documentation, the open function returns a boolean value saying whether it succeeded or not
                                          2. Where did you put the call to write ?
                                          3. Yes
                                          N Offline
                                          N Offline
                                          nick784512
                                          wrote on last edited by nick784512
                                          #43

                                          @SGaist

                                          1)Ok, I will try it.
                                          2)I just commented it.
                                          3) I wrote QSerialPort *serial; under private and it shows error

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