Path: utzoo!attcan!uunet!lll-winken!ames!pasteur!ucbvax!tut.cis.ohio-state.edu!bloom-beacon!earth.cray.COM!jlf
From: jlf@earth.cray.COM (John Freeman)
Newsgroups: comp.windows.x
Subject: Re:  AsciiDiskWidgets
Message-ID: <8902171611.AA17093@thelake.cray.com>
Date: 17 Feb 89 16:11:11 GMT
Sender: daemon@bloom-beacon.MIT.EDU
Organization: The Internet
Lines: 31

> ok, I give up.  Does anyone have an example of how to
> use XtDiskSourceCreate, XtStringSourceCreate, et. al.
> for a textWidget?  I want to be able to change the displayed
> file in a asciiDiskWidget at will (can be a readonly file)
> and send strings to an asciiStringWidget.
  
Here is a fragment of code from a program of mine that does
what you ask for, hopefully complete enough.

---------------------------------------------------------------
    Widget source_box;
    XtTextSource xtsp = NULL;
    Arg file_arg[] = {XtNfile,(XtArgVal) source_filename};

   /*
    * If XtDiskSourceCreate can't open source_filename, the whole
    * program will exit, so check first.
    */
    ret = open(source_filename, O_RDONLY);
    if (ret < 0) {
	sprintf(carray, "Can't open source file %s\n", source_filename);
	return;
    }

    if (xtsp) {                         /* close old */
	XtDiskSourceDestroy(xtsp);
    }

    /* Change file in source_box */
    xtsp = XtDiskSourceCreate(source_box, file_arg, XtNumber(file_arg));
    XtTextSetSource(source_box, xtsp, 0);