Download CGI Programming 101 by Jacqueline D. Hamilton PDF

By Jacqueline D. Hamilton

Designed for clients who already understand how to construct an online web page, this e-book demonstrates the ideas for including courses known as universal Gateway Interfaces (CGIs) to their websites. Hands-on examples begin with absolutely the fundamentals corresponding to the place to write down scripts, easy methods to add them and set dossier permissions, and the way to run them. extra complicated issues like processing varieties, examining and writing information records, and interacting with databases also are proven in transparent examples. additionally incorporated are tutorials on UNIX and the way to password-protect a website.

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Additional resources for CGI Programming 101

Example text

We use an if/else block in this program to see if the index is greater than -1. cgi If you have several different browsers installed on your computer, try testing the program 33 Chapter Three CGI Environment Variables with each of them. We’ll look more at if/else blocks in Chapter 5. A Simple Form Using GET There are two ways to send data from a web form to a CGI program: GET and POST. These methods determine how the form data is sent to the server. With the GET method, the input values from the form are sent as part of the URL and saved in the QUERY_STRING environment variable.

Htaccess file. htaccess file; it’s not the person’s email address. There is no reliable way to get a person’s email address, short of asking them for it with a web form. You can print the environment variables the same way you would any hash value: print "Caller = $ENV{HTTP_REFERER}\n"; Let’s try printing some environment variables. cgi, then try it in your web browser. Compare the environment variables displayed with the list on the previous page. Notice which values show information about your server and CGI program, and which ones give away information about you (such as your browser type, computer operating system, and IP address).

While Loops A while loop executes as long as particular condition is true: while (condition) { # code to run as long as condition is true } Until Loops until is the reverse of while. It executes as long as a particular condition is NOT true: until (condition) { # code to run as long as condition is not true } Infinite Loops An infinite loop is usually written like so: while (1) { # code here } Obviously unless you want your program to run forever, you’ll need some way to break out of these infinite loops.

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