[Last modified: Mar 96]

Answer: In .Xdefaults

*XmLabel*labelString:              Here\nis\nthe\nLabel

This method does not seem to work in some of the older Motif 1.0 versions.

In code,

char buf[128];
XmString msg;
strcpy(buf, "Here\nis\nthe\nLabel");
msg = XmStringCreateLtoR(buf, XmSTRING_DEFAULT_CHARSET);
XtSetArg (args[n], XmNlabelString, msg);

Gives a four line label, using the escape sequence \n for a newline.  Here's
another approach from Jean-Philippe Martin-Flatin <syj@ecmwf.int>

#include <Xm/Xm.h>
#include <string.h>

/*-----------------------------------------------------
Create a new XmString from a char*

This function can deal with embedded 'newline' and
is equivalent to XmStringCreateLtoR,
except it does not use non AES compliant charset
XmSTRING_DEFAULT_CHARSET
----------------------------------------------------*/
XmString xec_NewString(char *s)
{
XmString xms1;
XmString xms2;
XmString line;
XmString separator;
char     *p;
char     *t = XtNewString(s);   /* Make a copy for strtok not to */
                            /* damage the original string    */

separator = XmStringSeparatorCreate();
p         = strtok(t,"\n");
xms1      = XmStringCreateLocalized(p);

while (p = strtok(NULL,"\n"))
{
line = XmStringCreateLocalized(p);
xms2 = XmStringConcat(xms1,separator);
XmStringFree(xms1);
xms1 = XmStringConcat(xms2,line);
XmStringFree(xms2);
XmStringFree(line);
}

XmStringFree(separator);
XtFree(t);
return xms1;
}


Do not use XmStringCreateLocalized() - it does not process the newline
character in the way you want.   In Motif 1.x, XmStringCreateLocalized() does
NOT process newlines, but XmStringCreateLtoR() does.

Thanks to Paul Tomblin (ptomblin@xcski.com) for the newline clarification.