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How to Send Data from One Ui to Another

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  • D Offline
    D Offline
    delivite
    wrote on last edited by
    #1

    Hi,

    I have one MainWindow and one Class; I want to send data between them using custom signal and slot. I can't seem to figure it out, I need help.

    Here is my code:
    MainWindow.h

    #ifndef MAINWINDOW_H
    #define MAINWINDOW_H
    
    #include <QMainWindow>
    #include <iostream>
    #include "receive.h"
    QT_BEGIN_NAMESPACE
    namespace Ui { class MainWindow; }
    QT_END_NAMESPACE
    
    class MainWindow : public QMainWindow
    {
        Q_OBJECT
    
    public:
        MainWindow(QWidget *parent = nullptr);
        ~MainWindow();
    signals:
        void sendit(QString name);
    private slots:
        void on_send_button_clicked();
        void display(QString e)
        {        
         std::cout<<"Here is where I am called this "<<e.toStdString()<<std::endl;
        }
    
    private:
        Ui::MainWindow *ui;
       
    };
    #endif // MAINWINDOW_H
    

    MainWindow.cpp

    #include "mainwindow.h"
    #include "ui_mainwindow.h"
    #include "receive.h"
    
    MainWindow::MainWindow(QWidget *parent)
        : QMainWindow(parent)
        , ui(new Ui::MainWindow)
    {
        ui->setupUi(this);    
       Receive *r = new Receive();
       connect(this, SIGNAL(sendit(QString)), r, SLOT(display(QString)));
    
    }
    
    MainWindow::~MainWindow()
    {
        delete ui;
    }
    
    
    void MainWindow::on_send_button_clicked()
    {
        emit sendit(ui->lineEdit->text());
    
    }
    

    receive.h

    #ifndef RECEIVE_H
    #define RECEIVE_H
    
    #include <iostream>
    #include <QDialog>
    
    class Receive : public QDialog
    {
    public:
        Receive();
    private slots:
        void display(QString e);
    };
    
    #endif // RECEIVE_H
    

    receive.cpp

    #include "receive.h"
    #include "mainwindow.h"
    
    Receive::Receive()
    {
        
    }
    
    void Receive::display(QString e)
    {    
     std::cout<<"Here is where I am called this "<<e.toStdString()<<std::endl;
    }
    

    When I run this program, I get this message:

    06:26:29: Starting C:\Users\Troy\Documents\build-tests-Desktop_Qt_5_14_1_MinGW_32_bit-Debug\tests.exe ...
    QObject::connect: No such slot QDialog::display(QString) in ..\tests\mainwindow.cpp:11
    QObject::connect: (sender name: 'MainWindow')

    How do I get this done, please?

    Thank you for your help.

    jsulmJ 1 Reply Last reply
    0
    • D delivite

      Hi,

      I have one MainWindow and one Class; I want to send data between them using custom signal and slot. I can't seem to figure it out, I need help.

      Here is my code:
      MainWindow.h

      #ifndef MAINWINDOW_H
      #define MAINWINDOW_H
      
      #include <QMainWindow>
      #include <iostream>
      #include "receive.h"
      QT_BEGIN_NAMESPACE
      namespace Ui { class MainWindow; }
      QT_END_NAMESPACE
      
      class MainWindow : public QMainWindow
      {
          Q_OBJECT
      
      public:
          MainWindow(QWidget *parent = nullptr);
          ~MainWindow();
      signals:
          void sendit(QString name);
      private slots:
          void on_send_button_clicked();
          void display(QString e)
          {        
           std::cout<<"Here is where I am called this "<<e.toStdString()<<std::endl;
          }
      
      private:
          Ui::MainWindow *ui;
         
      };
      #endif // MAINWINDOW_H
      

      MainWindow.cpp

      #include "mainwindow.h"
      #include "ui_mainwindow.h"
      #include "receive.h"
      
      MainWindow::MainWindow(QWidget *parent)
          : QMainWindow(parent)
          , ui(new Ui::MainWindow)
      {
          ui->setupUi(this);    
         Receive *r = new Receive();
         connect(this, SIGNAL(sendit(QString)), r, SLOT(display(QString)));
      
      }
      
      MainWindow::~MainWindow()
      {
          delete ui;
      }
      
      
      void MainWindow::on_send_button_clicked()
      {
          emit sendit(ui->lineEdit->text());
      
      }
      

      receive.h

      #ifndef RECEIVE_H
      #define RECEIVE_H
      
      #include <iostream>
      #include <QDialog>
      
      class Receive : public QDialog
      {
      public:
          Receive();
      private slots:
          void display(QString e);
      };
      
      #endif // RECEIVE_H
      

      receive.cpp

      #include "receive.h"
      #include "mainwindow.h"
      
      Receive::Receive()
      {
          
      }
      
      void Receive::display(QString e)
      {    
       std::cout<<"Here is where I am called this "<<e.toStdString()<<std::endl;
      }
      

      When I run this program, I get this message:

      06:26:29: Starting C:\Users\Troy\Documents\build-tests-Desktop_Qt_5_14_1_MinGW_32_bit-Debug\tests.exe ...
      QObject::connect: No such slot QDialog::display(QString) in ..\tests\mainwindow.cpp:11
      QObject::connect: (sender name: 'MainWindow')

      How do I get this done, please?

      Thank you for your help.

      jsulmJ Offline
      jsulmJ Offline
      jsulm
      Lifetime Qt Champion
      wrote on last edited by
      #2

      @delivite Make your slot public, not private

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

      1 Reply Last reply
      1

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