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9.1. What Is WSH?
So what is WSH? A
language? As the name implies, WSH
"hosts" a language and provides a
shell to run scripts in. Scripts can be created in the language of
your choice (provided it's available).By default, WSH supports VBScript and Jscript as available scripting
languages. But other popular scripting languages, such as Perl, have
been implemented in the WSH environment. (To obtain
Perl,
which many people regard as the most powerful and versatile scripting
language available on any platform, visit http://www.activestate.com.)The capabilities provided in WSH, such as network and registry
access, are provided by ActiveX Component Object Model (COM)
objects. A COM object is a component that performs one or more
specific tasks. This may vary from something as simple as displaying
a message to running large applications. All Office applications are
COM objects and can be manipulated through WSH. Internet Explorer is
also a COM object. WSH itself provides a number of COM objects, and
there are also objects associated with some parts of the system, such
as the filesystem. Other functionality provided by COM objects
includes file access, messaging (email), and database access.The ability to use COM objects opens a whole world of possibilities
that were once available only in dedicated programming environments
such as C++ or Visual Basic. Once an object is created, it exposes
information and functionality to the programming environment (in this
case, WSH). Think of an object as a black box that performs specific
operations. The box exposes information and functionality through a
predefined set of commands. Since WSH has implemented core
functionality using COM objects, it doesn't rely on
language-specific features; many of the concepts discussed in this
chapter are applicable to any scripting language implemented through
WSH.
