Question

I access the Qt GUI’s QLabel’s QPixmap in another thread since I will finally use this to display mjpeg stream in QLabel, and I decided to use QLabel since its the easiest way
It should look like ‘Live’ and not block the UI thus using another (non-gui) thread.

nothing shows up in the QLabel. only the exception QPixmap: It is not safe to use pixmaps outside the GUI thread
any better or correct way to do this ?
here is my PyQt code of another thread: self.theQlabel.setPixmap(QtGui.QPixmap.fromImage(myQimg)

Answer 1

Instead of directly setting the pixmap, make the external thread emit an updatePixmap signal. Then in the GUI thread, listen to the signal and update the pixamp at that time. Something like that should work (in C++):

// In the GUI thread:

class YourWidget: QObject {

public:

    YourWidget();

public slots:

    void updatePixmap(const QPixmap& pixmap);

}

YourWidget::YourWidget() {
    // Connect to the signal here:
    QObject::connect(otherThread, SIGNAL(updatePixmap(const QPixmap&)), this, SLOT(updatePixmap(const QPixmap&)));
}

YourWidget::void updatePixmap(const QPixmap& pixmap) {
    // Update the pixmap here in a thread-safe way
}


// In the external thread:

// Emit the signal. The GUI thread will receive it and can then update the pixmap
emit updatePixmap(thePixmap);