Pop up a QMessageBox from a QThread

Macro

I'm in a thread and I would like to pop up a QMessageBox displaying a Text when a QPushButton is clicked, how do I do it?
Here's my code...

myThread.h

@#ifndef MYTHREAD_H
#define MYTHREAD_H

#include <QWidget>

namespace Ui {
class myThread;
}

class myThread: public QWidget
{
Q_OBJECT

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

private slots:
void on_pushButton_clicked();
void workThread();
};

#endif // MYTHREAD_H@

myThread.cpp

@#include "myThread.h"
#include "WorkThread.h"
#include <QThread>

myThread::myThread(QWidget *parent) :
QWidget(parent),
ui(new Ui::myThread)
{
ui->setupUi(this);
}

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

void myThread::on_pushButton_clicked()
{
workThread();
}

void myThread::workThread()
{
WorkThread *worker = new WorkThread(this);
QThread *workerThread = new QThread(this);

connect(workerThread, &QThread::started, worker, &WorkThread::doWork);
worker->moveToThread(workerThread);

workerThread->start();

}@

WorkThread.h

@#ifndef WORKTHREAD_H
#define WORKTHREAD_H

#include <QObject>

class WorkThread : public QObject
{
Q_OBJECT
public:
explicit WorkThread(QWidget *parentWidget, QObject *parent = 0);

public slots:
void doWork();

private:
QWidget *parentWidget;
};

#endif // WORKTHREAD_H@

WorkThread.cpp

@#include "WorkThread.h"
#include <QMessageBox>

WorkThread::WorkThread(QWidget *parentWidget, QObject *parent) :
QObject(parent)
{
}

void WorkThread::doWork()
{
QMessageBox *mBox = new QMessageBox(parentWidget);
mBox->setText("This is my Text");
}@

Here my application gets crashed which says that widgets must be created in the GUI Thread? Please Suggest.

SGaist

Hi,

You can't create widgets in any other thread than the main thread (the one from app.exec()) If you want to popup a message box based on something happening in a thread, you must emit a signal from that thread back to e.g. your main window and use your message box there