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I advise against using single-letter variables names but give a couple of places where they are reasonable. Can you think of any other legitimate uses for them Given var=192.168.0.123, write a script that uses parameter expansion to extract the second number, 168.

org/2001/XMLSchema"> <isAlive>true</isAlive> <PersonAge>21</PersonAge> <FirstName /> </Person> If you wish to persist an object s state in a manner that can be used by any operating system (eg, Windows XP, Mac OS X, and various Linux distributions), application framework (eg, NET, Java.

Menu item is the root of the menu tree Menu item is visible in the menu tree Menu item is visible in the breadcrumb Menu item links back to its parent Menu item can be modified by administrator Menu item was created by administrator Menu item is a local task Menu item is a local action

Enterprise Edition, and COM), or programming language, you do not want to maintain full type fidelity because you cannot assume all possible recipients can understand .NET-specific data types. Given this, SoapFormatter and XmlSerializer are ideal choices when you wish to ensure as broad a reach as possible for the persisted tree of objects.

You can use the BinaryFormatter type to illustrate how easy it is to persist an instance of the JamesBondCar to a physical file. Again, the two key methods of the BinaryFormatter type to be aware of are Serialize() and Deserialize(): Serialize(): Persists an object graph to a specified stream as a sequence of bytes. Deserialize(): Converts a persisted sequence of bytes to an object graph.

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Assume you have created an instance of JamesBondCar, modified some state data, and want to persist your spy mobile into a *.dat file. Begin by creating the *.dat file itself. You can achieve this by creating an instance of the System.IO.FileStream type. At this point, you can create an instance of the BinaryFormatter and pass in the FileStream and object graph to persist. Consider the following Main() method: // Be sure to import the System.Runtime.Serialization.Formatters.Binary // and System.IO namespaces. static void Main(string[] args) { Console.WriteLine("***** Fun with Object Serialization *****\n"); // Make a JamesBondCar and set state. JamesBondCar jbc = new JamesBondCar(); jbc.canFly = true; jbc.canSubmerge = false; jbc.theRadio.stationPresets = new double[]{89.3, 105.1, 97.1}; jbc.theRadio.hasTweeters = true; // Now save the car to a specific file in a binary format. SaveAsBinaryFormat(jbc, "CarData.dat"); Console.ReadLine(); } You implement the SaveAsBinaryFormat() method like this: static void SaveAsBinaryFormat(object objGraph, string fileName) { // Save object to a file named CarData.dat in binary. BinaryFormatter binFormat = new BinaryFormatter(); using(Stream fStream = new FileStream(fileName, FileMode.Create, FileAccess.Write, FileShare.None)) { binFormat.Serialize(fStream, objGraph); }

Console.WriteLine("=> Saved car in binary format!"); } The BinaryFormatter.Serialize() method is the member responsible for composing the object graph and moving the byte sequence to some Stream-derived type. In this case, the stream happens to be a physical file. You could also serialize your object types to any Stream-derived type, such as a memory location or network stream. Once you run your program, you can view the contents of the CarData.dat file that represents this instance of the JamesBondCar by navigating to the \bin\Debug folder of the current project. Figure 20-5 shows this file opened within Visual Studio 2010.

For example, the constant MENU_NORMAL_ITEM (define('MENU_NORMAL_ITEM', MENU_VISIBLE_IN_TREE | MENU_VISIBLE_IN_BREADCRUMB) has the flags MENU_VISIBLE_IN_TREE and MENU_VISIBLE_IN_BREADCRUMB, as shown in Table 4-4. Table 4-4. Flags of the Menu Item Type MENU_NORMAL_ITEM

Now suppose you want to read the persisted JamesBondCar from the binary file back into an object variable. Once you open CarData.dat programmatically (with the File.OpenRead() method), you can call the Deserialize() method of the BinaryFormatter. Be aware that Deserialize() returns a general System.Object type, so you need to impose an explicit cast, as shown here: static void LoadFromBinaryFile(string fileName) { BinaryFormatter binFormat = new BinaryFormatter(); // Read the JamesBondCar from the binary file. using(Stream fStream = File.OpenRead(fileName)) {

JamesBondCar carFromDisk = (JamesBondCar)binFormat.Deserialize(fStream); Console.WriteLine("Can this car fly : {0}", carFromDisk.canFly); } } Notice that when you call Deserialize(), you pass the Stream-derived type that represents the location of the persisted object graph. Once you cast the object back into the correct type, you will find the state data has been retained from the point at which you saved the object.

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