How to reopen the parent window after child window was set to hide?

[Mohammadreza99A]

I have a window which launches a second window like this:

this->hide();
signupWin = new signupWindow(get_this_peer(), this); /
signupWin->show();

I want to know how could I reopen (show) the main window that launched signupWin after signupWin was been hidden with this->hide()?

[jsulm]

@Mohammadreza99A Emit a signal in child which is connected in parent to a slot and in this slot call show().
Child emits this signel when parent needs to be shown again.

[dheerendra]

In addition to what @jsulm said, if there is parent & child relation ship exist between window, you will not be able to show the child. Keep these window objects without parent & child relationship.