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From: chuck@pluto.Harris-ATD.com (Chuck Musciano)
Newsgroups: alt.toolkits.xview,comp.windows.open-look
Subject: Re: problem attaching XV_KEY_DATA to panel
Message-ID: <6632@trantor.harris-atd.com>
Date: 29 Jun 91 12:00:48 GMT
References: <1991Jun27.221718.18172@leland.Stanford.EDU>
Sender: news@trantor.harris-atd.com
Reply-To: chuck@trantor.harris-atd.com
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Organization: Advanced Technology Dept, Harris Corp, Melbourne, FL
Lines: 40

In article <1991Jun27.221718.18172@leland.Stanford.EDU>, erose@hydro.Stanford.EDU (Eric Rose) writes:
> I seem to have found a problem storing a pointer with a Panel using
> XV_KEY_DATA.  The manual does not explicitly state that this is possible
> for all xview objects, but then again is does not give any reason why
> this is not possible.
> 
> I am running xview 2.0 (I think) under openwin 2.0 on a Sparc 2, SunOS 4.1.1
> 
> The code prints the string correctly while in main, but in the button callback
> prints garbage for the string.
> 
>     panel = (Panel)xv_create(frame,	PANEL,
> 			     XV_KEY_DATA,	1,	string,
> 			     NULL);

     It is not a good idea to use arbitrary key values with XV_KEY_DATA.  I
think the toolkit uses a few keys for its own use, and you may be hitting
those keys.  A better way to do this:

	Attr_attribute	THE_STRING;

	THE_STRING = xv_unique_key();
	
	panel = (Panel)xv_create(frame,	PANEL,
	                            XV_KEY_DATA, THE_STRING, string,
				 NULL);

and then later

    	printf("The string is %s\n", xv_get(panel, XV_KEY_DATA, THE_STRING));

-- 

Chuck Musciano				ARPA  : chuck@trantor.harris-atd.com
Harris Corporation 			Usenet: ...!uunet!x102a!trantor!chuck
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