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Date: Mon, 13 Jan 1997 01:47:47 -0800
From: Chris Kemp <ckemp@ro.com>
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Organization: Silicon Graphics
X-Mailer: Mozilla 3.01 (Win95; I)
MIME-Version: 1.0
To: ckemp@ro.com
Subject: MIME Test
Content-Type: multipart/mixed; boundary="------------6B797646304"
X-UIDL: 48f2146a82b1f706edbd5e7c350b352a
X-Mozilla-Status: 0001
This is a multi-part message in MIME format.
--------------6B797646304
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Chris,
I have attached a picture of the Boeing F-22 to this message.
--------------6B797646304
Content-Type: image/jpeg; name="F22.jpg"
Content-Transfer-Encoding: base64
Content-Disposition: inline; filename="F22.jpg"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<a few hundred K of encoded data removed>
sS+TZPzi8xpdeS/Jmoana6tf6VYteahqd8v1ixlmto4bi91KSRI45P8AX4tir9CMVdirsVdi
rsVdirsVdirsVdirsVdirsVdirsVdirsVdirsVdirsVdirsVdirsVdirsVdirsVdirsVdirs
VdirsVdirsVdirsVeRfn5y/5UX+dHH7X+BPMVP8AuGXGLCX0v//Z
--------------6B797646304--
Notice the MIME content type declarations throughout the message. A practical application of the Mime::Base64 decode_base64 function would be extracting the encoded data to a file. Using this method, you could allow users to submit pictures via e-mail of items that could be integrated into a Web page.
Using MIME::QuotedPrint
Mime::QuotedPrint includes the functions encode_qp and decode_qp that function in the same way as their Base64 counterparts. The syntax is as follows:
$encoded = encode_yp($decoded); $decoded = decode_yp($encoded);
MIME is significant to the Web programmer in two main ways. MIME and its different data types define standard types of data that can be transmitted as part of a document. MIME headers are used in every HTTP transaction, thus a familiarity with them is essential in advanced applications where your program must generate headers. MIME encoding schemes allow binary data to be included in text messages that can be transported over older e-mail (not HTTP) gateways.
Simple PleasuresExamples
- Guest Book
- Hit Counter
- Clickable Maps
- Text File Search
- E-Mail Notification
This chapter will provide several examples of things that all Webmasters might want to incorporate into their Web sites. It will, hopefully, illustrate the power of Perl and prove why Perl has become the de facto standard when it comes to CGI programming. All of these examples involve server-side CGI programs, and they are ubiquitous real-world programs out on the World Wide Web.
You have already learned the basics of Perl5 and how the WWW libraries are used. It is now time to put what you've learned to practical use. You will see how to implement a guest book, a page hit counter, a clickable image map, a text file searching program, and an automatic e-mail notification script.