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From: neek@NEEK.FAC.CS.CMU.EDU (Craig Marcus)
Newsgroups: comp.windows.x.motif
Subject: Re: Has anyone used XmStringGetSegment?
Message-ID: <1990Aug10.140636.20447@cs.cmu.edu>
Date: 10 Aug 90 14:06:36 GMT
References: <9008100138.AA08292@alphalpha.com>
Sender: netnews@cs.cmu.edu (USENET News Group Software)
Reply-To: neek@NEEK.FAC.CS.CMU.EDU (Craig Marcus)
Distribution: inet
Organization: Carnegie Mellon University
Lines: 42

Keywords
  
  !> A friend sent me this code, saying it core-dumped on his machine.
  |> On mine it just doesn't work.  I mucked with it a little to no avail.
  |>
  |> Note that if you take out the concat and just do it with the first
  |> Label it went into an infinite loop printing out null strings. 
              ....
     7  |> {
     8  |>  XmString           Label, s1, s2;
     9  |>  XmStringContext   Context;
    10  |>  char              *LabelChars;
    11  |>  XmStringCharSet   CharSet;
    12  |>  XmStringDirection Direction;
    13  |>  Boolean           Separator;
    14  |>
    15  |>  Label =XmStringCreateLtoR("Death",XmSTRING_DEFAULT_CHARSET);
    16  |>  s1 = XmStringCreateLtoR("andTaxes",XmSTRING_DEFAULT_CHARSET);
    17  |>  Label = XmStringConcat(Label, s1);
    18  |>  if (XmStringInitContext(&Context, Label) == False)
    19  |>  {
    20  |>    printf("XmStringInitContext Failed\n");
    21  |>    exit(0);
    22  |>  }
    23  |>
    24  |>  while (XmStringGetNextSegment(&Context, &LabelChars,
&CharSet, &Dire
ction, &Separator)) {
    25  |>      printf("LabelChars='%s'\n", LabelChars);
    26  |>  }


     The problem with this code is that the "Context" variable is one level 
     of indirection off, ie Context is a pointer to a structure as populated
     by XmStringInitContext.  Therefore, in line 24 above, change the
     first parameter from "&Context" to "Context" and the code should run
     fine.


Neek
Carnegie Mellon University
Pittsburgh