Re: About Check Menu Item

["jacky618 jacky618" <hhd618 hotmail com>]

The problem has been resovled, thanks

> From: "Nix N. Nix" <nix go-nix ca>
> To: jacky618 jacky618 <hhd618 hotmail com>
> Subject: Re: About Check Menu Item
> Date: Wed, 11 Aug 2004 07:53:52 -0400
>
> On Wed, 2004-08-11 at 04:31, jacky618 jacky618 wrote:
> > Hi,
> >
> > I have a trouble with me when using Gtk+ . In my program, a check menu 
was
> > used as following:
> >
> > void on_menuitem_1_toggled(GtkCheckMenuItem        *ckMnItem,
> >                                         gpointer         user_data)
> > {
> >     printf("***");
> >
> >     if (GTK_CHECK_MENU_ITEM(ckMnItem)->active == TRUE)
> >         printf("###");
> >     else
> >         printf("@@@@");
>
>   if (you_want_weird_looking_printfs)
>     fflush (stdout) ;
>   else
>     printf ("\n") ;
> > }
> >
> >
> >   menu1 = gtk_menu_new();
> >
> >   menuitem_1 = gtk_check_menu_item_new_with_label("Linkage status"));
> >   gtk_signal_connect (GTK_OBJECT( menuitem_1), "toggled",
> >                     (GtkSignalFunc) on_menuitem_1_toggled,
> >                     menuitem_1);
> >
> >   gtk_menu_append(GTK_MENU(menu1),menuitem_1);
> >   gtk_widget_show(menuitem_1);
> >
> > I hope when the check menu item was selected, it will print  "***###"
> > immediately,and "***@@@" when unselected. However, it can not print
> > immediately after the menu item was clicked.And until the main window 
was
> > closed, the strings will appear.
>
> The strings do not appear because the streams stdout and stderr are line
> buffered.  That is, when you issue a printf, the text does not show up
> until "\n" is part of one of the printfs.
>
> Alternatively, after you're done all your printfs, call fflush(stdout).
> This overrides the line buffering, and guarantees that everything in
> stdout is actually on the screen.

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