art@dinorah.mit.EDU (Arthur B. Smith) (02/09/89)
Hello! Is there any value that is never a valid XID? I would like to know if a window has been defined just by checking the value of the window, not carrying around another flag. In X.h "None" is #define'd to 0L with the comment "universal null resource or null atom". Does that mean I can do something like if (win == None) win = XCreateSimpleWindow(...); ? TIA. art smith (art@dinorah.wustl.edu)
kit@ATHENA.MIT.EDU (Chris D. Peterson) (02/10/89)
> In X.h "None" is #define'd to 0L with the > comment "universal null resource or null atom". Does that mean I can > do something like > if (win == None) > win = XCreateSimpleWindow(...); Yep, this will work just fine. You must have a line like this above the conditional, of course. Window win = None; Chris D. Peterson MIT X Consortium / Project Athena Net: kit@athena.mit.edu Phone: (617) 253 - 1326 USMail: MIT - Room E40-321 77 Massachusetts Ave. Cambridge, MA 02139