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byte[] msgAsByteArray = Encoding.Default.GetBytes(msg); // Write byte[] to file. fStream.Write(msgAsByteArray, 0, msgAsByteArray.Length); // Reset internal position of stream. fStream.Position = 0; // Read the types from file and display to console. Console.Write("Your message as an array of bytes: "); byte[] bytesFromFile = new byte[msgAsByteArray.Length]; for (int i = 0; i < msgAsByteArray.Length; i++) { bytesFromFile[i] = (byte)fStream.ReadByte(); Console.Write(bytesFromFile[i]); } // Display decoded messages. Console.Write("\nDecoded Message: "); Console.WriteLine(Encoding.Default.GetString(bytesFromFile)); } Console.ReadLine(); } This example populates the file with data, but it also punctuates the major downfall of working directly with the FileStream type: it demands to operate on raw bytes. Other Stream-derived types operate in a similar manner. For example, if you wish to write a sequence of bytes to a region of memory, you can allocate a MemoryStream. Likewise, if you wish to push an array of bytes through a network connection, you can use the NetworkStream class (in the System.Net.Sockets namespace). As mentioned previously, the System.IO namespace provides several reader and writer types that encapsulate the details of working with Stream-derived types.

A wildcard at the end of the menu path does not interfere with the passing of additional parts of the URL to the page callback, because the wildcard matches only up to the next slash. Continuing with our example of the menufun/% path, the URL http://example.com/ q=menufun/foo/Fred would have the string foo matched by the wildcard, and the last portion of the path (Fred) would be passed as a parameter to the page callback.

The StreamWriter and StreamReader classes are useful whenever you need to read or write characterbased data (e.g., strings). Both of these types work by default with Unicode characters; however, you can change this by supplying a properly configured System.Text.Encoding object reference. To keep things simple, assume that the default Unicode encoding fits the bill. StreamReader derives from an abstract type named TextReader, as does the related StringReader type (discussed later in this chapter). The TextReader base class provides a limited set of functionality to each of these descendents; specifically it provides the ability to read and peek into a character stream. The StreamWriter type (as well as StringWriter, which you will examine later in this chapter) derives from an abstract base class named TextWriter. This class defines members that allow derived types to write textual data to a given character stream.

To aid in your understanding of the core writing capabilities of the StreamWriter and StringWriter classes, Table 20-8 describes the core members of the abstract TextWriter base class. Table 20-8. Core Members of TextWriter

To use the part of the path that matched, specify the number of the path s part in the page arguments key: function menufun_menu() { $items['menufun/%/bar/baz'] = array( 'title' => 'Hi', 'page callback' => 'menufun_hello', 'page arguments' => array(1), // The matched wildcard. 'access callback' => TRUE, ); return $items; } /** * Page callback. */

Close()

This method closes the writer and frees any associated resources. In the process, the buffer is automatically flushed (again, this member is functionally equivalent to calling the Dispose() method). This method clears all buffers for the current writer and causes any buffered data to be written to the underlying device; however, it does not close the writer. This property indicates the newline constant for the derived writer class. The default line terminator for the Windows OS is a carriage return, followed by a line feed (\r\n). This overloaded method writes data to the text stream without a newline constant. This overloaded method writes data to the text stream with a newline constant.

function menufun_hello($name = NULL) { return t('Hello. $name is @name', array('@name' => $name)); } The parameters received by our page callback function menufun_hello() will be as shown in Figure 4-11.

Flush()

Write() WriteLine()

Figure 4-11. The first parameter is from the matched wildcard. The first parameter, $name, is being passed via the page callback. The entry array(1) for the page callback means, please pass part 1 of the path, whatever that is. We start counting at 0, so part 0 is menufun, part 1 is whatever the wildcard matched, part 2 would be bar, and so on. The second parameter, $b, is being passed because of Drupal s behavior of passing the portion of the path beyond the Drupal path as a parameter (see Page Callback Arguments earlier in this chapter).

Note The last two members of the TextWriter class probably look familiar to you. If you recall, the System.Console type has Write() and WriteLine() members that push textual data to the standard output device. In fact, the Console.In property wraps a TextWriter, and the Console.Out property wraps a TextReader.