hello,

So I explain, I did several tests to display a random value in a LineEdit Here is what the window looks like: (I'm with QMainWindow)
Capture.PNG

Then the .cpp and .h:

.h
Qt Code: 
  1. #ifndef MAINWINDOW_H
  2. #define MAINWINDOW_H
  3.  
  4. #include <QMainWindow>
  5.  
  6. namespace Ui {
  7. class MainWindow;
  8. }
  9.  
  10. class MainWindow : public QMainWindow
  11. {
  12.     Q_OBJECT
  13.  
  14. public:
  15.     explicit MainWindow(QWidget *parent = 0);
  16.     ~MainWindow();
  17.  
  18. private:
  19.     Ui::MainWindow *ui;
  20.  
  21. private slots:
  22.     void Statut_Changed(int value);
  23. };
  24.  
  25. #endif // MAINWINDOW_H
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.cpp
Qt Code: 
  1. #include "mainwindow.h"
  2. #include "ui_mainwindow.h"
  3.  
  4. MainWindow::MainWindow(QWidget *parent) :
  5.     QMainWindow(parent),
  6.     ui(new Ui::MainWindow)
  7. {
  8.     ui->setupUi(this);
  9. }
  10.  
  11. MainWindow::~MainWindow()
  12. {
  13.     delete ui;
  14. }
  15.  
  16.  void MainWindow::Statut_Changed(int value)
  17. {
  18.     value = 50;
  19.      ui->lineEdit->setText(value);
  20. }
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I would like to display the desired value in the LineEdit and once done, create a connection between QwtTHermo and LineEdit.
For example, by setting the value 50, I would like this value to be displayed in the lineEdit and also displayed in QwtThermo

Do you have an idea ?
Already to display the value in lineEdit

Thank you for your help