Hello,

i'm doing the same thing for an hour, i followed this tutorial on Youtube (http://www.youtube.com/watch?v=PR6wV...f=mfu_in_order), about threads, and i don't understand why my code doesn't work :

my label is supposed to take a number from 0 to 1000, but the label's content doesn't change, the text in the label stays "as is", if i put the text "number" in it, this string "number" won't be changed by an int from 0 to 1000. Here's my code :

dialog.h :
Qt Code: 
  1. #ifndef DIALOG_H
  2. #define DIALOG_H
  3.  
  4. #include <QDialog>
  5. #include <QtGui>
  6. #include "mythread.h"
  7.  
  8. namespace Ui {
  9.     class Dialog;
  10. }
  11.  
  12. class Dialog : public QDialog
  13. {
  14.     Q_OBJECT
  15.  
  16. public:
  17.     explicit Dialog(QWidget *parent = 0);
  18.     ~Dialog();
  19.     MyThread *mThread;
  20.  
  21. public slots:
  22.     void onNumberEmit(int);
  23.  
  24. private slots:
  25.     void on_pushButton_clicked();
  26.     void on_pushButton_2_clicked();
  27.  
  28. private:
  29.     Ui::Dialog *ui;
  30. };
  31.  
  32. #endif // DIALOG_H
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dialog.cpp :
Qt Code: 
  1. #include "dialog.h"
  2. #include "ui_dialog.h"
  3.  
  4. #include "mythread.h"
  5.  
  6. Dialog::Dialog(QWidget *parent) :
  7.     QDialog(parent),
  8.     ui(new Ui::Dialog)
  9. {
  10.     ui->setupUi(this);
  11.  
  12.     mThread = new MyThread(this);
  13.  
  14.     connect(mThread, SIGNAL(NumberEmit(int)), this, SLOT(onNumberEmit(int)));
  15. }
  16.  
  17. Dialog::~Dialog()
  18. {
  19.     delete ui;
  20. }
  21.  
  22. void Dialog::on_pushButton_clicked()
  23. {
  24.     //QMessageBox::warning(this, "alert", "all");
  25.     mThread->start();
  26. }
  27.  
  28. void Dialog::on_pushButton_2_clicked()
  29. {
  30.     mThread->Stop = true;
  31.  
  32. }
  33.  
  34. void Dialog::onNumberEmit(int num){
  35.     ui->label->setText(QString::number(num));
  36. }
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mythread.h :
Qt Code: 
  1. #ifndef MYTHREAD_H
  2. #define MYTHREAD_H
  3.  
  4. #include <QThread>
  5.  
  6. class MyThread : public QThread
  7. {
  8.     Q_OBJECT
  9. public:
  10.     explicit MyThread(QObject *parent = 0);
  11.     void run();
  12.     bool Stop;
  13.  
  14. signals:
  15.     void NumberEmit(int);
  16.  
  17. public slots:
  18.  
  19. };
  20.  
  21. #endif // MYTHREAD_H
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mythread.cpp :
Qt Code: 
  1. #include "mythread.h"
  2. #include <QtCore>
  3.  
  4. MyThread::MyThread(QObject *parent) :
  5.     QThread(parent)
  6. {
  7. }
  8.  
  9. void MyThread::run(){
  10.     for (int i=0; i<1000; i++){
  11.         QMutex mutex;
  12.         mutex.lock();
  13.         if (this->Stop) break;
  14.         mutex.unlock();
  15.  
  16.         //this->msleep(100);
  17.  
  18.         emit NumberEmit(i);
  19.     }
  20. }
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Thanks for your help !