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From: grp@Unify.com (Greg Pasquariello)
Newsgroups: comp.windows.x
Subject: Re: UNIX/X-windows questions
Message-ID: <1991Jan28.105219@Unify.com>
Date: 28 Jan 91 18:52:19 GMT
References: <139@bwilab3.UUCP> <1441@rascal.UUCP> <960@redford.UUCP> <99@tdatirv.UUCP>
Sender: news@Unify.Com (news admin)
Reply-To: grp@Unify.com (Greg Pasquariello)
Organization: Unify Corporation, Sacramento, CA, USA
Lines: 36

In article <99@tdatirv.UUCP>, sarima@tdatirv.UUCP (Stanley Friesen) writes:
> In article <960@redford.UUCP> bill@redford.UUCP (Bill Poitras(X258)) writes:
> >>In article <139@bwilab3.UUCP> chris@bwilab3.UUCP (Chris Curtin) writes:
> >>>Is there a call to see if we are in X? ...
> 
> >The best way is to try to open the display XOpenDisplay(":0.0").  If it
> >returns NULL, then you can't connect to the server, whether it is there
> >or not.
> 
> The problem with this is that it assumes the application and the X server
> are on the same machine!  A chancy assumption at best, given the design of X.
> I would try to use something like:
> 
> dp = getenv(DISPLAY);
> display = XOpenDisplay(dp);
> if(display == NULL)
> {
> 	/* use curses or something */
> }
> else
> {
> 	/* Initialize your X toolkit */
> }

No, use XOpenDisplay(NULL).  That will do the job of the getenv for
you.  If the open fails, NULL will be returned.

> -- 
> ---------------
> uunet!tdatirv!sarima				(Stanley Friesen)

--

---
Greg Pasquariello	
Unify Corporation 	grp@Unify.Com