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Recall that I said that Drupal cannot produce a valid link from a Drupal path that contains a wildcard, like user/% (after all, how would Drupal know what to replace the % with) That s not strictly true. We can define a helper function that produces a replacement for the wildcard that Drupal can then use when building the link. In the My account menu item, the path for the My account link is produced with the following steps: 1. 2. The Drupal path is originally user/%user_uid_optional. When building the link, Drupal looks for a function with the name user_uid_optional_to_arg(). If this function is not defined, Drupal cannot figure out how to build the path and does not display the link. If the function is found, Drupal uses the result of the function as a replacement for the wildcard in the link. The user_uid_optional_to_arg() function returns the user ID of the current user, so if you are user 4, Drupal connects the My account link to http://example.com/ q=user/4.

Read()

ReadXXXX()

The following example (a Console Application named BinaryWriterReader) writes a number of data types to a new *.dat file: static void Main(string[] args) { Console.WriteLine("***** Fun with Binary Writers / Readers *****\n"); // Open a binary writer for a file. FileInfo f = new FileInfo("BinFile.dat"); using(BinaryWriter bw = new BinaryWriter(f.OpenWrite())) {

The use of a to_arg() function is not specific to the execution of a given path. In other words, the to_arg() function is run during link building on any page, not the specific page that matches the Drupal path of a menu item. The My account link is shown on all pages, not just when the page http://example.com/ q=user/3 is being viewed.

// Print out the type of BaseStream. // (System.IO.FileStream in this case). Console.WriteLine("Base stream is: {0}", bw.BaseStream); // Create some data to save in the file double aDouble = 1234.67; int anInt = 34567; string aString = "A, B, C"; // Write the data bw.Write(aDouble); bw.Write(anInt); bw.Write(aString); } Console.ReadLine(); } Notice how the FileStream object returned from FileInfo.OpenWrite() is passed to the constructor of the BinaryWriter type. Using this technique makes it easy to layer in a stream before writing out the data. Note that the constructor of BinaryWriter takes any Stream-derived type (e.g., FileStream, MemoryStream, or BufferedStream). Thus, writing binary data to memory instead is as simple as supplying a valid MemoryStream object. To read the data out of the BinFile.dat file, the BinaryReader type provides a number of options. Here, you call various read-centric members to pluck each chunk of data from the file stream: static void Main(string[] args) { ... FileInfo f = new FileInfo("BinFile.dat"); ... // Read the binary data from the stream. using(BinaryReader br = new BinaryReader(f.OpenRead())) { Console.WriteLine(br.ReadDouble()); Console.WriteLine(br.ReadInt32()); Console.WriteLine(br.ReadString()); } Console.ReadLine(); }

Now that you have a better handle on the use of various readers and writers, you ll look at the role of the FileSystemWatcher class. This type can be quite helpful when you wish to monitor (or watch ) files on

The to_arg() function that Drupal will look for when building a link for a menu item is based on the string following the wildcard in the Drupal path. This can be any string, as in this example: /** * Implementation of hook_menu(). */ function_menufun_menu() { $items['menufun/%a_zoo_animal'] = array( 'title' => 'Hi', 'page callback' => 'menufun_hello', 'page arguments' => array(1),