How do you exit X11 program without Error

Question

I have a fairly simple \"Hello World\" in X11 at end of question. But when it exits I get the run time error messages below:

$ ./xtest
XIO:  fatal IO error 11 (R         


        

Answer 1

Just call XDestroyWindow() right before XCloseDisplay().

Edit:

Sorry, I didn't understand the XSetWMProtocols thing. Now I've read up on it. I think you're accessing the wrong member of the event union.

XDestroyWindow(display,e.xdestroywindow.window);

Should probably be:

XDestroyWindow(display,e.xclient.window);