Setting the title of a Motif Window - c

Question

I am trying to set the title of a toplevel Motif 2.1 window.
From O'Reilly Volume Six A, I have seen that in Motif 2.1 XtVaOpenApplication is recommended to create a toplevel Widget.
In this appendix it can be seen how options and XtNumber(options) are used to act on resources via argument list.
I have tried to use it to generate an optional flag -title WINDOW_TITLE while invoking the program, without sucess.
This is what I have tried:
#include <stdlib.h>
#include <stdio.h>
#include <Xm/Xm.h>
#include <Xm/PushB.h>
static XrmOptionDescRec options[] = {
{ "-title", "XmNtitle", XrmoptionIsArg, NULL },
};
int main(int argc, char *argv[]) {
Widget toplevel; /* Top Level Button */
XtAppContext app; /* Application Context */
char *window_title = NULL; /* Top Level Window Title */
/* INITIALIZE TOP LEVEL WINDOW */
XtSetLanguageProc(NULL, NULL, NULL);
toplevel = XtVaOpenApplication( &app, argv[0], options, XtNumber(options), &argc, argv, NULL, sessionShellWidgetClass, NULL);
/* REALIZE TOPLEVEL WINDOW AND LAUNCH APPLICATION LOOP */
XtRealizeWidget(toplevel);
XtAppMainLoop(app);
return 0;
}
The program compiles but it does not react to -title MYTITLE command line argument.
This is the makefile (works on FreeBSD 12):
test: test.o
cc -L/usr/local/lib -O -o test test.o -lXm -lXt -lX11
test.o: test.c
cc -I/usr/local/include -c test.c
How can I change the title of the window based on an optional argument named -title?

Answer 1

The correct xrm option line is
{"-title", ".title", XrmoptionSepArg, NULL}
You don't actually need to specify it because it is in the default Xt option table.
In general you omit XmN when specifying xrm resource names.

Answer 2

In my Motif programs, I use Xlib directly, since Motif does not seem to handle correctly the UTF8 setting of window titles using XmNtitle property. Most modern window managers expect UTF8 string passed as _NET_MW_NAME.
void setWindowTitleUTF8(Widget w, char *title)
{
static Atom atoms[3];
static bool first = TRUE;
if (first)
{
static char *atom_names[] = {"_NET_WM_NAME", "_NET_WM_ICON", "UTF8_STRING"};
first = FALSE;
XInternAtoms(XtDisplay(w), atom_names, 3, FALSE, atoms);
}
XChangeProperty(XtDisplay(w), XtWindow(w), atoms[_NET_WM_NAME], atoms[UTF8_STRING], 8,
PropModeReplace, (unsigned char *) title, strlen(title));
}
Make sure you call it on XtParent() of your widget, so it is applied to top level widget shell.

Answer 3

Please investigate further yourself (I'm no X/Motif expert), but sth seems to be off with the argument parsing.
Replacing options with NULL ant its size with 0 in call XtVaOpenApplication call seems to do the trick:
toplevel = XtVaOpenApplication( &app, argv[0], NULL, 0, &argc, argv, NULL, sessionShellWidgetClass, NULL);