When I call the createWindowContainer function, I can't perform the MIME drag and drop function on Ubuntu, but it works fine on Windows.

1.DragDropChild is an embedded window.
2.Running it produces winId output in the terminal.
3.Record the value of this winId and fill in the parameters of the ProcessData function in the mainwindow.cpp of the DragDropMain application.
4.Then compile and run DragDropMain.