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However, it is a good tool for use in an environment where high availability and redundancy are key This script performs very well In testing, I was logged into the system through the network and, after executing some commands validating connection, I disconnected the primary interface cable The failover of the interface occurred in less than 10 seconds and my command-line session carried on as if nothing had happened Depending on when the interface failure occurs, the maximum time for a failover to complete would be about 15 seconds The script first checks network availability, sleeps for 10 seconds, wakes up and checks again, and continuously repeats this process The shortest amount of time the script could take to recognize and execute a failover is probably less than 5 seconds Most systems can take that amount of interruption without much impact.

Figure 4-10. File chooser buttons When the user clicks a GtkFileChooserButton, an instance of GtkFileChooserDialog is opened that allows the user to browse and select one file or one folder, depending on the type of button you created.

12. Finally, from the Asset Library drag an instance of the StopMedia Behavior to the Stop button,

need to directly interface with it at this point, because GtkFileChooserButton will handle all interactions with the dialog.

Like in many scripts in this book, the configuration of variables happens in the script itself It would probably make for cleaner code to save the configuration information in a separate file, which can then be sourced from the script If this were done, you could change the values without interfering with the code..

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You are able to change basic settings such as the currently selected file, the current folder, and the title of the file selection window. Listing 4-10 shows you how to use both types of file chooser buttons.

change the EventName to Stop, and use the Target Picker to set TheME to the TargetObject once again. You have now wired up all three of your buttons: Play, Pause, and Stop. Press F5 to run the application and try out the different buttons. You have now a completed, functional Media Player that has very cool transition effects as well as functional media controls. You can find my source code for both projects from this chapter here: Simple VSM Project: http://windowspresentationfoundation.com/Blend4Book/ SimpleVSMProject.zip Media Player: http://windowspresentationfoundation.com/Blend4Book/SLVSMMediaPlayer.zip

This first group of configuration variables sets up the log file where log entries for any potential network failures will be entered. The primary and secondary interface names are also defined. These names will change depending on your hardware and operating system. For instance, network interfaces on most Linux machines have names like eth0 or eth1. Other UNIX variants might use names such as iprb0 or en1. We also determine the system name so that failover messages can indicate the machine that had the problem. The following code sets the networking information. These are the settings that will be switched when a failure occurs:

Listing 4-10. Using the File Chooser Button (filechooserbuttons.c) #include <gtk/gtk.h> static void folder_changed (GtkFileChooser*, GtkFileChooser*); static void file_changed (GtkFileChooser*, GtkLabel*); int main (int argc, char *argv[]) { GtkWidget *window, *chooser1, *chooser2, label, *vbox; GtkFileFilter *filter; gtk_init (&argc, &argv); window = gtk_window_new (GTK_WINDOW_TOPLEVEL); gtk_window_set_title (GTK_WINDOW (window), "File Chooser Button"); gtk_container_set_border_width (GTK_CONTAINER (window), 10); label = gtk_label_new (""); /* Create two buttons, one to select a folder and one to select a file. */ chooser1 = gtk_file_chooser_button_new ("Chooser a Folder", GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER); chooser2 = gtk_file_chooser_button_new ("Chooser a Folder", GTK_FILE_CHOOSER_ACTION_OPEN); /* Monitor when the selected folder or file are changed. */ g_signal_connect (G_OBJECT (chooser1), "selection_changed", G_CALLBACK (folder_changed), (gpointer) chooser2); g_signal_connect (G_OBJECT (chooser2), "selection_changed", G_CALLBACK (file_changed), (gpointer) label); /* Set both file chooser buttons to the location of the user's home directory. */ gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (chooser1), g_get_home_dir()); gtk_file_chooser_set_current_folder (GTK_FILE_CHOOSER (chooser2), g_get_home_dir());

Summary

/* Provide a filter to show all files and one to show only 3 types of images. */ filter1 = gtk_file_filter_new (); filter2 = gtk_file_filter_new (); gtk_file_filter_set_name (filter1, "Image Files"); gtk_file_filter_set_name (filter2, "All Files"); gtk_file_filter_add_pattern (filter1, "*.png"); gtk_file_filter_add_pattern (filter1, "*.jpg"); gtk_file_filter_add_pattern (filter1, "*.gif"); gtk_file_filter_add_pattern (filter2, "*"); /* Add both the filters to the file chooser button that selects files. */ gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser2), filter1); gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (chooser2), filter2); vbox = gtk_vbox_new (FALSE, gtk_box_pack_start_defaults gtk_box_pack_start_defaults gtk_box_pack_start_defaults 5); (GTK_BOX (vbox), chooser1); (GTK_BOX (vbox), chooser2); (GTK_BOX (vbox), label);

IP=`grep $ME /etc/hosts | grep -v '^#' | awk '{print $1}'` NETMASK=255.255.255.0 BROADCAST="`echo $IP | cut -d\. -f1-3`.255"

In this chapter you learned all about the Visual State Manager and Blend 4 s States panel. You created a simple Silverlight application and created a StateGroup and two States to control how a simple Rectangle behaved when the mouse was over it and when the mouse was not. You then created another Silverlight project and styled up a cool looking Media Player. You also created a custom Silverlight Button Control. You used Behaviors to add the MouseEnter and MouseLeave functionality to switch between

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