twice execution of click on pushbutton?

[squidge]

You are right, now it works! But why? If I don't connect the SLOTs and SIGNALs automatically or manually, the click on button should not call the corresponding function at all, but it does now. Why?

setupUi() calls connectSlotsByName. You are then calling it yourself too, thus you get two function call per click

[rambo83]

Thank you very much for the explanations. They were very helpful.