How to connect the signal and slot in multi-thread program?

[justforfun]

The mainwindow.cpp:

@#include "ui_mainwindow.h"
#include <QtCore>

/* ****** Thread part ****** */
myThread::myThread(QObject *parent)
: QThread(parent)
{
}

void myThread::run()
{
while(1){
qDebug("thread one----------");
emit threadSignal1();
usleep(100000);
}
exec();
}

myThread2::myThread2(QObject *parent)
: QThread(parent)
{
}

void myThread2::run()
{
while(1){
qDebug("thread two");
emit threadSignal2();
usleep(100000);
}
exec();
}
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

onethread = new myThread(this);
onethread->start(QThread::NormalPriority);

twothread = new myThread2(this);
twothread->start(QThread::NormalPriority);

connect(onethread, SIGNAL(onethread->threadSignal1()),
        this, SLOT(mySlot1()));
connect(twothread, SIGNAL(threadSignal2()),
        this, SLOT(mySlot2()),Qt::QueuedConnection);

}

void MainWindow::mySlot1()
{
ui->textEdit1->append("This is thread1");
}

void MainWindow::mySlot2()
{
ui->textEdit1->append("This is thread2");
}

MainWindow::~MainWindow()
{
delete ui;
}

void MainWindow::on_pushButton_clicked()
{
ui->textEdit1->append("textEdit1");
ui->textEdit2->append("textEdit2");
}@

The mainwindow.h:

@#define MAINWINDOW_H

#include <QMainWindow>
#include <QThread>

namespace Ui {
class MainWindow;
}

class myThread : public QThread
{
Q_OBJECT

public:
myThread(QObject *parent = 0);
void run();

signals:
void threadSignal1();
};

class myThread2 : public QThread
{
Q_OBJECT

public:
myThread2(QObject *parent = 0);
void run();

signals:
void threadSignal2();
};

class MainWindow : public QMainWindow
{
Q_OBJECT

public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
void mySlot1();
void mySlot2();

private slots:
void on_pushButton_clicked();

private:
Ui::MainWindow *ui;
myThread *onethread;
myThread2 *twothread;
};

#endif // MAINWINDOW_H@

Please check the above code. It can give the qDebug output normally while the textEdit1/2 have no any output. And it seems to be a multi-thread signal/slot connect issue. Who can help? Thanks!

[podsvirov]

You provide the code - it is good. But I can not understand what you want?
In mainwindow.h file put slots in the public section:

@
public slots:
void mySlot1();
void mySlot2();
@

Without this, these methods are not slots, so do not working in connection.

[justforfun]

Yes, you are right. This is the root cause! After correcting it, the code can work now. Thank you!

[podsvirov]

Glad to help!
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