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Chapter 9. The Windows Script Host
One
of the features that has distinguished operating systems like Unix
and Linux from Windows is that they've made it
relatively easy to write scripts that automate repetitive tasks.
Since doing the same thing over and over again is one of the basic
labor-saving benefits of a computer, the lack of robust scripting
capabilities has always been one of the great weaknesses of Windows.Originally released as part of Windows 98, the
Windows Script Host (WSH) is
Microsoft's answer to this problem and a replacement
for the remarkably limited batch file language (see Chapter 6). The addition of WSH to the Windows
platform represents a major step forward in Windows'
role in the networking world.WSH provides a way to automate Windows-based graphical applications
using any one of several, powerful, full-featured
scripting languages. WSH
provides a set of objects that allow you to interact with the
network, Registry, files and folders, and even other applications,
using scripting languages such as VBScript and Microsoft
JScript (a
JavaScript-like language). Third-party add-ons that provide the same
functionality in other scripting languages, such as
Perl,
Tcl,
REXX, and
Python, are also
available.WSH scripts can be used to create network login scripts that are more
complex than those that are built into Windows, and can be used to
automate local Desktop tasks. The resulting scripts can be run from
the Desktop, from the command line, or via the
Explorer's Scheduled Tasks. WSH scripts can also be
embedded in HTML files, which in turn can be used as part of the
Active Desktop.Unfortunately, while WSH is powerful, it is not for the
faint-hearted. If you do not already know a scripting language such
as VBScript, JavaScript, or Perl, you should get a good book on the
language of your choice before starting out. Learning
VBScript , by Paul Lomax; JavaScript, The
Definitive Guide , by David Flanagan; and
Learning Perl on Win32 Systems , by Randal
Schwartz, Erik Olson, and Tom Christiansen, are three useful books
available from O'Reilly.This chapter shows how to run WSH scripts, gives a brief introduction
to VBscript programming, and describes the syntax of the objects
provided by WSH. It also describes how to use the Object Browser to
discover information about system and application objects, and
concludes with some practical examples that illustrate the power of
WSH scripts.
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