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static GdkColor global_color; static guint global_alpha = 65535; int main (int argc, char *argv[]) { GtkWidget *window, *hbox, *modal, *nonmodal; gint i; gtk_init (&argc, &argv); /* Loop through the parameters. The first color name that is specified and * successfully parsed, it will be used as the initial color of the selection. */ for (i=1; i < argc; i++) if (gdk_color_parse (argv[i], &global_color)) break; window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "Color Selection Dialogs"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); gtk_widget_set_size_request (window, 200, 75); modal = gtk_button_new_with_label ("Modal"); nonmodal = gtk_button_new_with_label ("Non-Modal"); g_signal_connect (G_OBJECT (modal), "clicked", G_CALLBACK (modal_clicked), (gpointer) window); g_signal_connect (G_OBJECT (nonmodal), "clicked", G_CALLBACK (nonmodal_clicked), (gpointer) window); hbox = gtk_hbox_new (TRUE, 10); gtk_box_pack_start_defaults (GTK_BOX (hbox), modal); gtk_box_pack_start_defaults (GTK_BOX (hbox), nonmodal);

In addition to the folder structure, the wizard creates an important area registration class. This class contains information describing the name and routing information for the area and allows us to modify the default area registration information. If we used the wizard, our area registration class would be similar to listing 21.1.

gtk_container_add (GvtTK_CONTAINER (window), hbox); gtk_widget_show_all (window); gtk_main (); return 0; } /* Create a new color selection dialog that is modal. */ static void modal_clicked (GtkButton *button, GtkWindow *window) { run_color_selection_dialog (button, window, TRUE); } /* Create a new color selection dialog that is nonmodal. */ static void nonmodal_clicked (GtkButton *button, GtkWindow *window) { run_color_selection_dialog (button, window, FALSE); } /* Create a new color selection dialog and allow the user to choose a color * and an opacity value. */ static void run_color_selection_dialog (GtkButton *button, GtkWindow *window, gboolean domodal) { GtkWidget *dialog, *colorsel; gchar *title; if (domodal) title = "Choose Color -- Modal"; else title = "Choose Color -- Non-Modal"; dialog = gtk_color_selection_dialog_new (title); gtk_window_set_modal (GTK_WINDOW (dialog), domodal); colorsel = GTK_COLOR_SELECTION_DIALOG (dialog)->colorsel; gtk_color_selection_set_has_opacity_control (GTK_COLOR_SELECTION (colorsel), TRUE);

If Alice wanted to send a lot of secret information to Bob, she would have to send much more non-secret information to mask the secret information To attempt to remedy this, Alice could use more of the bits in the pixels to encode her information However, the more bits that are used as part of the covert channel, the more perceivable the alternations in color to the image, and the more obvious it might be to an attacker that steganography is being used In theory, steganography can be used together with encryption to leverage some of the advantages of both If a message is encrypted before it is inserted into a covert channel, a third party will not only have to determine that there is a covert channel in use and obtain the contents of the secret message, but he ll then have to decrypt it as well.

public class AdminAreaRegistration : AreaRegistration { public override string AreaName { get { return "Admin"; Specifies } area name }

gtk_color_selection_set_current_color (GTK_COLOR_SELECTION (colorsel), &global_color); gtk_color_selection_set_current_alpha (GTK_COLOR_SELECTION (colorsel), global_alpha); g_signal_connect (G_OBJECT (dialog), "response", G_CALLBACK (dialog_response), NULL); gtk_widget_show_all (dialog); } /* Handle the response identifier from the assistant. Either tell the user to * read the manual, retrieve the new color value or destroy the dialog. */ static void dialog_response (GtkDialog *dialog, gint result, gpointer data) { GtkWidget *colorsel; GdkColor color = { 0, }; guint16 alpha = 0; switch (result) { case GTK_RESPONSE_HELP: g_print("Read the GTK+ API documentation.\n"); break; case GTK_RESPONSE_OK: colorsel = GTK_COLOR_SELECTION_DIALOG (dialog)->colorsel; alpha = gtk_color_selection_get_current_alpha (GTK_COLOR_SELECTION (colorsel)); gtk_color_selection_get_current_color (GTK_COLOR_SELECTION (colorsel), &color); g_print ("#%04X%04X%04X%04X\n", color.red, color.green, color.blue, alpha); global_color = color; global_alpha = alpha; default: gtk_widget_destroy (GTK_WIDGET(dialog)); } }

public override void RegisterArea( AreaRegistrationContext context) { context.MapRoute( "Admin_default", "Admin/{controller}/{action}/{id}", new { controller = "Profile", action = "Index", id = UrlParameter.Optional } ); } }