Question

Can not find any reference on how to close application by the “X” button. I’m programming using XCB and want to close the program by the “X” button. I looked and can’t find anything about it. I know how to close by pressing a button. Also, by pressing the “X” button the window looks like it closes but doesn’t.

Answer 1

I struggled on this topic some time ago as well.

Look at http://marc.info/?l=freedesktop-xcb&m=129381953404497 .

The key is to store the cookie for the WM_DELETE_WINDOW in a separate cookie…

xcb_intern_atom_cookie_t cookie2 = xcb_intern_atom(c, 0, 16, "WM_DELETE_WINDOW");
xcb_intern_atom_reply_t* reply2 = xcb_intern_atom_reply(c, cookie2, 0);

and in the event loop compare the client_message with the cookie2

case XCB_CLIENT_MESSAGE:
{
    if((*(xcb_client_message_event_t*)event).data.data32[0] == (*reply2).atom) ...
}