Quote Originally Posted by Ginsengelf View Post
Hi, you can't manipulate a widget from another thread than the main thread where the widget was created.

To solve your problem, create a slot in your main window to update the label and emit a signal instead of the MainWindow::ui->imgLabel->setPixmap(...) call.

Ginsengelf
It's quite difficult for me.. Can you quickly explain how to do that in terms of places where to put the code (and what kind of code) ?
Thank you so much

Gian