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Richard Conn |
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12 September 1999 |
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Premise |
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The Big Picture (Client Side/Server Side) |
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What You Have to Create |
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Setting Up the Ada Data Server |
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Ada Source Code (4 slides) |
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Web Page HTML Code (2 slides) |
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Before the Form’s SUBMIT Button is Pressed |
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Fill Out the Form |
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After the Form’s SUBMIT Button is Pressed |
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Message Received After Data Sent |
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Interpreting the Data |
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References |
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Client Side |
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A form written in HTML is filled in by the user |
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When the SUBMIT button on the form is pressed,
the data on the form is encoded and sent to the data server on the Web
Server |
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Server Side |
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The Web Server receives the URL of the Data
Server and launches it as a normal program, passing the encoded data onto
it via standard input (if the POST method is used on the Client Side) or
the command line (if the GET method is used on the Client Side) |
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Copy the Ada Source Code to the Computer Hosting
the Web Server and Place it into a Common Gateway Interface (CGI) Binary
Directory (BIN) |
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Compile the Ada Source Code (it has to run on
this machine) |
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Edit the HTML in the Web page, changing the
ACTION attribute of the FORM tag to contain the URL of the compiled Ada
program |
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You are DONE!
You can now load the Web page into any client that can access the
Web Server |
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The encoded data consists of ASCII characters as
follows: |
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Normal characters (e.g., A, B, C, 1, 2) |
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The = sign (used to separate the name and the
value from a name=value pair) |
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The & symbol (used to separate one
name=value pair from another) |
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A hexadecimal value for the form %xx, where xx
is a 2-character hexadecimal code (e.g., 0D, 1C, AB) |
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There are at least two approaches to writing Ada
packages that do this conversion for you on the ASE CDROM |
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Musciano and Kennedy, HTML: The Definitive
Guide, 3rd Edition, O’Reilly, 1998, ISBN 1-56592-492-4 –
contains authoritative reference information on forms and encoding types |
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Ada and Software Engineering Update 2 CDROM, Ada
User’s Bookshelf, Walnut Creek CDROM, October 1999, ISBN 1-57176-235-3 –
contains Ada95 Reference Manual and Ada95 Packages supporting CGI-BIN
Interfaces |
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Notes