Hello wysota,

Thank you for your answer.

My english must be really bad... sorry about that. But why do all people say the same: I know it!

I KNOW: To call between non-gui threads and gui thread I have to use singal and slot.
On line 24 to 27 what do you think I supposed to do? I use signal/slot principle.

But this is not working without a call in the main thread... line 37