CSC151.02 2003F, Class 45: CGI Scripting
Admin:
* Today's goal: A little fun.
* Have a great Thanksgiving break!
* Remember to turn in your guessing game before you leave or before 5pm tomorrow, whichever comes first.
* Yes, you need to document the guessing game.
* Yes, your game should give correct answers.
* Yes, your game should give an answer! (Provided the preconditions are met).
* Yes, your game should use divide and conquer.
* Yes, I'll be amused if you write one that guesses randomly *in addition to* the one that you are supposed to write.
* Expect a take-home exam tonight or tomorrow. It will be due Tuesday of hell week.
* Don't expect any more homework (except for nightly readings and labs and ...).
Overview:
* About the Web
* CGI Scripts
* Sam's See-Gee-Eye Script Strategy for Scheme
* Lab
In order to build an interactive Web program, we need to know or figure
out the following:
* How to write a Web page that provides input to the server.
* How to write a Scheme program that generate HTML.
* How those Scheme programs can get the input from the Web page.
* How to tell our Web server to run our Scheme program.
* Simple mechanism for sending input to the server
How to write a Scheme program that generates HTML
(string-append "" mytitle "...")
* Or use a library to help.
How to get Scheme programs to read the input from the Web page.
* Use Sam's library (include "/home/rebelsky/Web/Scheme/webutils.scm")
* Call (get-cgi-variable VARIABLE-NAME VALUE-TO-USE-IF-UNDEFINED)
How to make the Web server run your Scheme program
* Create a procedure called (page) that will call get-cgi-variable and generate the page.
(define page
(lambda ()
(string-append ...)))
* Save your Scheme file as text.
* Make your Scheme file readable to the world.
chmod a+r myprogram.scm
* Create a .cgi file that reads
#!/bin/bash
/home/rebelsky/Web/schemeweb myprogram.scm
* Make that file readable and executable
chmod a+r myprogram.cgi
chmod a+x myprogram.cgi