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LabVIEW Internet Toolkit User Guide
™
Version 6.0
The LabVIEW Internet Toolkit provides you with the ability to incorporate
Internet capabilities into VIs. You can use LabVIEW to work with XML
documents, build CGI programs and URLs, and send and receive data.
The Internet Toolkit includes the following components:
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XML DOM Parser and VIs—Create, access, and edit XML
documents in LabVIEW.
CGI VIs—Build CGI programs and manage client state information.
G Web Server—Publish VIs to the Web and host CGI applications.
Online examples—Learn how to build and use CGI VIs by reviewing
online example VIs that you can run from the G Web Server.
URL Client VIs—Parse and build URLs and download data from
Internet servers.
FTP VIs—Store and retrieve files from FTP (File Transfer Protocol)
servers.
Telnet VIs—Send and receive data using the Telnet protocol.
Refer to the LabVIEW Help for more information about the URL Client
VIs, FTP VIs, and Telnet VIs.
Contents
Upgrading from Version 2
Getting Started with the XML 2
Using XML DOM .3
Validating 3
Configuring the XML 4
Using CGI 5
Maintaining Client State Information with .6
Using 7
Using 7
Getting Started with the G 8
LabVIEW™, National Instruments™, NI™, ™, and NI Developer Zone™ are trademarks of NationalInstruments
Corporation. Product and company names mentioned hereinare trademarks or trade names of their respective
companies. For patents covering NationalInstruments products, refer to the appropriate location: Help»Patents in your
software, the file on your CD, or /patents.
January 2004
323747A-01
© 1999–2004 National Instruments Corp. All rights reserved.
Configuring the G 9
Running the G 10
Viewing 12
Examining Online 12
Displaying the G Web Server Window in 13
Using CGI VIs with the G .15
Publishing Front Panel Images with the G 15
Where to Go 15
Upgrading from Version 5.0
The Internet Toolkit version 6.0 contains the following changes from
version 5.0:
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You can use the Internet Toolkit version 6.0 only with LabVIEW
version 7.0 or later.
You can select one of two different modes to run the G Web Server.
Inindependent mode, the G Web Server runs on a port different from
the one on which the LabVIEW Web Server runs. In shared-port mode,
the G Web Server shares a port with the LabVIEW Web Server and
handles only CGI requests, while the LabVIEW Web Server handles
other requests. Refer to the Configuring the G Web Server section for
more information about selecting modes for the G Web Server.
You can use XML DOM Parser features to read, write, or process XML
documents. Refer to the Getting Started with the XML DOM Parser
section for more information about using XML features in LabVIEW.
You can find the SMTP E-mail VIs on the Functions palette in the Full
and Professional Development Systems of LabVIEW version 7.0. The
filenames for these VI changed slightly. The Internet Toolkit includes
compatibility libraries that automatically replace the version 5.0 VIs
with the LabVIEW 7.0 VIs when you open a VI that contains the older
version of the SMTP E-mail VIs.
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Getting Started with the XML DOM Parser
XML (Extensible Markup Language) is a platform-independent subset of
SGML (Standard Generalized Markup Language) that you can use to store
and exchange information. When you work with XML documents, you can
use a parser to extract and manipulate data without having to translate the
XML format directly. For example, the DOM (Document Object Model)
Core specification defines a programming interface for creating, reading,
and modifying XML documents. The DOM Core specification defines the
properties and methods that an XML DOM Parser must support.
LabVIEW Internet Toolkit User
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