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The next step is to add a delegate to DirectoryNode: public delegate void ScannedEventHandler(object sender, ScannedItemEventArgs e); Then, you ll declare two events: one for a directory being scanned and one for a file being scanned: public event ScannedEventHandler DirectoryScanned; public event ScannedEventHandler FileScanned; Finally, you ll add functions to fire the events Having separate functions for these isn t strictly necessary, but they make the class a bit easier to use and easier to derive from The event framework is now ready The next step is to modify the code in Populate() so it fires the events An interesting subtlety exists here The class that uses the events will hook up.

The OFA location for the database itself is ORACLE_BASE/q/d, where q is the string oradata and d is the name of the database A Linux example for a database called orcl is

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The symbol table for a package can be accessed as a hash For example, the main package s symbol table can be accessed as %main:: or, more simply, as %:: Likewise, symbol tables for other packages are %MyMathLib:: The format is hierarchical, so that symbol tables can be traversed using standard Perl code The main symbol table includes a reference to all the other top-level symbol tables, so the preceding nested example could be accessed as %main::Math::Base The keys of each symbol hash are the identifiers of the symbols for the specified package; the values are the corresponding typeglob values This explains the use of a typeglob, which is really just accessing the value in the hash for the corresponding key from the symbol table The following code prints out the symbol table for the main package:

foreach $symname (sort keys %main::) { local *symbol = $main::{$symname}; print "\$$symname is defined\n" if defined $symbol; print "\@$symname is defined\n" if defined @symbol; print "\%$symname is defined\n" if defined %symbol; }

Within the database directory, the controlfile copies, online redo logfiles, and datafiles should be named as follows:

You can also use the symbol table to define static scalars by assigning a value to a typeglob:

nn is a unique number nn is the online redo logfile group number the datafile s tablespace name and a number

*C = 299792458;

TIP OFA does not specify the naming convention for multiplexed online redo logfiles Many DBAs suffix the OFA name with a letter to differentiate members in the same group: redo01alog, redo01blog

to the events declared in the root directory node, but since the Populate() function is recursive, it can t fire the events using its own events Instead, it needs to use the root s events You do this by writing a private version of Populate() that takes a DirectoryNode as a parameter and by passing the root object as a parameter during recursive calls You then modify the public version to call the private version To hook up the events, you need to declare the functions to be called when the event is fired, as part of the main form class: void myFileScanned(object sender, ScannedItemEventArgs e) { statusBar1Text = "File: " + eName; } void myDirectoryScanned(object sender, ScannedItemEventArgs e) { statusBar1Text = "Directory: " + eName; } These functions merely update the status bar with the name of the file.

You now cannot modify $C, the speed of light, since the variable $C does not really exist Perl is just allowing us to access a typeglob as a scalar value Note that uppercase is used for the constant, even though normally the speed of light is specified as c This is a convention in Perl Constants and filehandles are typically in uppercase, variables and functions are lowercase, and package names are specified in title case Although this is convention, Perl doesn t really care!

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