Path: utzoo!mnetor!tmsoft!torsqnt!hybrid!scifi!bywater!uunet!tdatirv!sarima
From: sarima@tdatirv.UUCP (Stanley Friesen)
Newsgroups: comp.windows.x
Subject: Re: UNIX/X-windows questions
Message-ID: <99@tdatirv.UUCP>
Date: 25 Jan 91 20:58:25 GMT
References: <139@bwilab3.UUCP> <1441@rascal.UUCP> <960@redford.UUCP>
Reply-To: sarima@tdatirv.UUCP (Stanley Friesen)
Organization: Teradata Corp., Irvine
Lines: 25

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 */
}
-- 
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uunet!tdatirv!sarima				(Stanley Friesen)