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One of the points of DiskDiff is to be able to compare the current state of a directory tree to a previous state. It s therefore important to be able to store and retrieve that state. The logical way to do this in the .NET Framework is to use serialization. This is one of the areas in which a managed environment really shines; the runtime already has enough information in the metadata associated with a class to be able to do the serialization. You must write only the serialization code and define how you want your classes to be serialized. The .NET Framework supports serialization either to SOAP format (the same XML format used by Web services) or to a binary format. For this example, we ve decided to use SOAP formatting since it s easy to look at the resulting file and see what s happening.3 After adding Save and Open menu items on the File menu, add the following code in the save event handler:

.

This is an example of the CreateDBsql script:

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t is almost impossible to make good use of a programming language without at some point having to access information from or about files Accessing the information in a file is relatively easy, but unless you know the exact name of the file, you are basically stuck Perl supports a number of ways of extracting the list of files, either by using the familiar wildcard operations that you use within a shell, or by reading individual file names directly from the directory You can also glean more information about the file that you are using You may need to find out the file size or perhaps the file permissions to test whether you can access a file We will also take a look in this chapter at ways of controlling files, including deleting files, and creating and accessing symbolic and hard links It is inevitable that at some point you will need to communicate with the outside world We will consider three basic outside influences in this chapter: screen, keyboard, and files In fact, Perl works much like many other languages The default input and output devices are the screen and the keyboard, but these devices can also be referenced via files Unlike C, Perl uses, within reason, the same set of functions for communicating with the terminal, keyboard, pipes (external commands or command input), network sockets, and files This creates less confusion while you are working and helps optimize the language This means that many of the functions we will look at can be used not only for accessing files but also for accessing any kind of external data stream outside of the main Perl script The basics of handling files are simple: you associate a filehandle with an external entity (usually a file) and then use a variety of operators and functions within Perl to read and update the data stored within the data stream associated with the filehandle This is similar to other languages that use the same structure In C, for example, a FILE structure contains all the information on a data stream and acts as the reference point for using the data stored within that stream Using files and filehandles effectively, particularly when using network sockets or providing an interactive user interface, also requires more complex controls on the capabilities and data handling of individual filehandles This can be achieved using fcntl and ioctl two functions that provide an interface to the underlying operating system equivalents Furthermore, in a complex installation you need to be able to handle data I/O between multiple files simultaneously This can be achieved using a simple round-robin approach, but a more reliable and efficient method is to use the select function, which is examined in some detail in this chapter.

All of the functions in this chapter are derived or descended from their operating system equivalents It is vital that you check the return values of all the functions in this chapter, especially those that modify the execution environment for the script, such as chdir and unlink In most cases, if there is an error, the error string is stored in the $! variable, which should be used with the die or warn function to report the error to the user See 9 for more information on using these functions

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