Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!rochester!bbn.com!nic!hri!rudolph
From: rudolph@hri.com (Dave Rudolph)
Newsgroups: comp.windows.x.motif
Subject: Re: Has anyone used XmStringGetSegment?
Message-ID: <1990Aug15.133409.23403@hri.com>
Date: 15 Aug 90 13:34:09 GMT
References: <9008100138.AA08292@alphalpha.com>
Distribution: inet
Organization: Horizon Research Inc.
Lines: 62

In article <9008100138.AA08292@alphalpha.com> nazgul@alphalpha.com (Kee Hinckley) writes:
>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.
>
>#include <stdio.h>
>#include <Xm/Xm.h>
>
>void main(argc, argv)
>     int argc;
>     char *argv[];
>{
> XmString           Label, s1, s2;
> XmStringContext   Context;
> char              *LabelChars;
> XmStringCharSet   CharSet;
> XmStringDirection Direction;
> Boolean           Separator;
>
> Label = XmStringCreateLtoR("Death", XmSTRING_DEFAULT_CHARSET);
> s1 = XmStringCreateLtoR("and Taxes", XmSTRING_DEFAULT_CHARSET);
> Label = XmStringConcat(Label, s1);
> if (XmStringInitContext(&Context, Label) == False)
> {
>   printf("XmStringInitContext Failed\n");
>   exit(0);
> }
>
> while (XmStringGetNextSegment(&Context, &LabelChars, &CharSet, &Direction, &Separator)) {
>     printf("LabelChars='%s'\n", LabelChars);
> }
>
>}

I had problems with this sequence also, and I found that the
documentation is screwed up.  I don't have it in front of me, so I can't
tell you exactly what the problem was, but it involved the first
parameter to XmStringGetNextSegment (context) and whether or not it was
a pointer.  I think the doc said it should be a pointer, but it should
not be.  Anyway, the following code worked for me.  Note that the init
call uses "&context", while the get call uses just "context".

char *getstring(str)
        XmString str;
{
        caddr_t context;
        char *text;
        XmStringCharSet charset;
        XmStringDirection direction;
        Boolean separator;
        int res;

        XmStringInitContext (&context,str);
	XmStringGetNextSegment(context,&text,&charset,&direction,&separator);
        return text;
}

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David Rudolph                   |       phone: (617) 466-8370
Horizon Research, Inc.          |       email: rudolph@hri.com

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