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for reading the value of a tied variable; STORE, for assigning a value to a tied variable; and DESTROY, which deletes the tied variable when you call untie The FETCH and STORE methods are used to provide an interface to the variable that has been tied, not the underlying object Accessing the object directly doesn t invoke these methods The object reference is available either by using tied or by capturing the value returned by tie, which will be a reference to the underlying object being used

We ll use the methods for tying scalars as our base reference, examining the entire process from start to finish For this we ll use the example of file ownership, supported by the FileOwner package When you tie a scalar using the methods in the FileOwner class, the variable tied contains the name of the file Accessing the tied variable returns the owner (name, or user ID if the name cannot be resolved) Assigning a value to the tied variable sets the file s ownership, accepting a user ID or name accordingly For example, consider this script:

use FileOwner; tie $profile, 'FileOwner', 'bash_profile'; print "Current owner is: $profile\n"; $profile = 'mcslp'; print "New owner is: $profile\n"; PROGRAMMING WITH PERL

F 2 7 G Compilation fails H An exception is thrown at runtime 3 Given:

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When the tie function is called, what actually happens is that the TIESCALAR method from FileOwner is called, passing 'bash_profile' as the argument to the method This returns an object, which is associated by tie to the $profile variable When $profile is used in the print statements, the FETCH method is called When you assign a value to $profile, the STORE method is called, with 'mcslp' as the argument to the method If you can follow this, then you can create tied scalars, arrays, and hashes, since they all follow the same basic model Now let s examine the details of our new FileOwner class, starting with the TIESCALAR method:

A fundamental part of the Perl language is its ability to read and process file data very quickly In 1 we saw how the historical development of Perl was geared toward text processing long before it gained the general-purpose status it holds now All file data is exchanged through the use of a filehandle, which associates an external data source (a file, network socket, external program, pipe) with an internal data structure (the filehandle) The method with which you associate the filehandle

7:

varies depending on the type of external data source, although many of the functions used to access the data available with the filehandle are the same For files, you use the open function to open ordinary files and the sysopen function to handle more complex opening procedures The close function is used to close any open filehandle, regardless of how it was opened

42 43 44 45 46 47 String s = ""; if(011 == 9) s += 4; if(0x11 == 17) s += 5; Integer I = 12345; if(IintValue() == IntegervalueOf("12345")) s += 6; Systemoutprintln(s);

The open function is almost certainly one of the most complicated to understand when you first approach the Perl language Once grasped, however, it becomes easy and almost second nature in use, often making the methods employed in other languages seem clumsy and constricting

The first form is the one used most often The FILEHANDLE is a token name that allows you to refer to a file with a specific name A FILEHANDLE in any function can alternatively be an expression, which is evaluated; the value being used as the filehandle name If the expression supplied does not evaluate to a suitable value, Perl does not make one up for you You must ensure, therefore, that the expression you supply in place of FILEHANDLE evaluates to something identifiable The EXPR is more complex Perl takes the value supplied, interpolates the string where necessary, and then strips any leading or trailing white space The string is then examined for special characters at the start and end of the string that define the mode and type of file to be opened The basic operators are the greater-than/less-than signs The syntax is taken from the shell, which uses a less-than sign to pass file contents to the standard input of a command Within Perl, this translates to this:

open(DATA, "<filetxt");

Divert errors to a user-defined function, set with the set_error_handler() function:

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