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Volume 6A: Motif Programming Manual
book

Volume 6A: Motif Programming Manual

by David Brennan, Dan Heller, Paula Ferguson
September 1993
Intermediate to advanced content levelIntermediate to advanced
1014 pages
28h 26m
English
O'Reilly Media, Inc.
Content preview from Volume 6A: Motif Programming Manual
{
Widget toplevel = (Widget) client_data;
extern char *SaveStateAndReturnFileName(); /* hypothetical function */
char *filename = SaveStateAndReturnFileName ();
puts("save_state()");
save_argv = (char **) XtRealloc (save_argv,
(save_argc+2) * sizeof (char *));
save_argv[save_argc++] = "−restart";
save_argv[save_argc++] = filename;
XSetCommand (XtDisplay (toplevel), XtWindow (toplevel),
save_argv, save_argc); /* notice the order of these args! */
}
This program registers the WM_SAVE_YOURSELF protocol using XmAddWMProtocols() before it specifies the
callback routine. If the session manager sends a WM_SAVE_YOURSELF message to this program then the
save_state() function is called, which causes the program to save its internal state using the function
SaveStateAndReturnFileName(). This is a hypothetical function that you would write yourself to save the
state of the program and return the filename that contains the state information. The callback routine also adds the
−restart flag and the new filename to the saved argv from the beginning of the program. The function
XSetCommand() is used to set the WM_COMMAND property on the window associated with the top−level shell,
which fulfills the program's obligation to the session manager.
For more information about session managers and the save−yourself communication protocol, see Volume Zero, X
Protocol Reference Manual. For more details on XSetCommand() and other Xlib−based functions that set and get
window manager properties on top−level windows, ...
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Publisher Resources

ISBN: 9780596000431