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The choice between POP3 and POP3_SSL is governed by whether your e-mail provider offers or, in this day and age, even requires that you connect over an encrypted connection. Consult 6 for more information about SSL, but the general guideline should be to use it whenever it is at all feasible for you to do so. Listing 14 1 uses the foregoing steps to log in to a remote POP server. Once connected, it calls stat(), which returns a simple tuple giving the number of messages in the mailbox and the messages total size. Finally, the program calls quit(), which closes the POP connection. Listing 14 1. A Very Simple POP Session #!/usr/bin/env python # POP connection and authentication - 14 - popconn.py import getpass, poplib, sys if len(sys.argv) != 3: print 'usage: %s hostname user' % sys.argv[0] exit(2) hostname, user = sys.argv[1:] passwd = getpass.getpass() p = poplib.POP3_SSL(hostname) # or "POP3" if SSL is not supported try: p.user(user) p.pass_(passwd) except poplib.error_proto, e: print "Login failed:", e else: status = p.stat() print "You have %d messages totaling %d bytes" % status finally: p.quit() You can test this program if you have a POP account somewhere. Most people do even large webmail services like GMail provide POP as an alternate means of checking your mailbox. Run the preceding program, giving it two command-line arguments: the hostname of your POP server, and your username. If you do not know this information, contact your Internet provider or network administrator; note that on some services your username will be a plain string (like guido), whereas on others it will be your full e-mail address (guido@example.com). The program will then prompt you for your password. Finally, it will display the mailbox status, without touching or altering any of your mail.

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UPC-A - Barcode4J - SourceForge
The configuration for the default implementation is: <barcode> < upc-a > <height>{ length:15mm}</height> <module-width>{length:0.33mm}</module-width> ...

When printed, the Boolean values true and false are represented by the string output values True and False. int x = 5, y = 4; Console.WriteLine("x == x is {0}", x == x); Console.WriteLine("x == y is {0}", x == y);

Everything begins and ends with data. The Internet is a global tool to publish, organize, and share data. With that in mind, it is important to understand the formats commonly used in mashups to send, receive, and store data. Remember, the content of data can be endless. It can contain search results, links, photos, news, video, geographic locations, and audio. The list of content that can be formatted and delivered grows all the time.

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UPC-A is also known as Universal Product Code version A, UPC-A Supplement 5/Five-digit Add-On, UPC-A Supplement 2/Two-digit Add-On, UPC-A +5, ...

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Generate and draw UPC-A for Java
Integrate UPC-A barcode generation function to Java applications for drawing UPC-A in Java .

Caution! While this program does not alter any messages, some POP servers will nonetheless alter mailbox flags simply because you connected. Running the examples in this chapter against a live mailbox could cause you to lose information about which messages are read, unread, new, or old. Unfortunately, that behavior is serverdependent, and beyond the control of POP clients. I strongly recommend running these examples against a test mailbox rather than your live mailbox!

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racca3141/UPC: Build a UPC-A label. - GitHub
27 Apr 2018 ... UPCMain . java is a command line program that takes in a 12 digit number and checks to see if it is a valid UPC-A barcode. It does this by ...

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Here is how you might run the program: $ ./popconn.py pop.example.com guido Password: (type your password) You have 3 messages totaling 5675 bytes If you see output like this, then your first POP conversation has taken place successfully! When POP servers do not support SSL to protect your connection from snooping, they sometimes at least support an alternate authentication protocol called APOP, which uses a challenge-response scheme to assure that your password is not sent in the clear. (But all of your e-mail will still be visible to any third party watching the packets go by!) The Python Standard Library makes this very easy to attempt: just call the apop() method, then fall back to basic authentication if the POP server you are talking to does not understand. To use APOP but fall back to plain authentication, you could use a stanza like the one shown in Listing 14 2 inside your POP program (like Listing 14 1). Listing 14 2. Attempting APOP and Falling Back print "Attempting APOP authentication..." try: p.apop(user, passwd) except poplib.error_proto: print "Attempting standard authentication..." try: p.user(user) p.pass_(passwd) except poplib.error_proto, e: print "Login failed:", e sys.exit(1)

The where clauses can be listed in any order. The constraints in a where clause, however, must be placed in a particular order, as shown in Figure 19-9. There can be at most one primary constraint, and if there is one, it must be listed first. There can be any number of InterfaceName constraints. If the constructor constraint is present, it must be listed last.

Caution! As soon as a login succeeds by whatever method, some older POP servers will lock the mailbox. Locking might mean that no alterations to the mailbox may be made, or even that no more mail may be delivered until the lock is gone. The problem is that some POP servers do not properly detect errors, and will keep a box locked indefinitely if your connection gets hung up without your calling quit(). At one time, the world s most popular POP server fell into this category! So it is vital to always call quit() in your Python programs when finishing up a POP session. You will note that all of the program listings shown here are careful to always quit() down in a finally block that Python is guaranteed to execute last.

To say that XML is an important part of how data is used in mashups is an understatement. XML seems to be the foundation for everything these days. XML is not the data itself but a way to represent the data using elements to provide structure, in the same way HTML does. The difference between HTML and XML is that with XML you can create your own custom elements to represent data in any way you want, whereas HTML is just for marking up web pages. XML s primary purpose is to facilitate the sharing of data across different information systems, particularly via the Internet.

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BE THE CODER > Barcodes > Barcode4j Examples > Barcode UPC-A
Barcode4J is a free and flexible Java library for Barcode generation. This requires the ... in classpath. The following example shows generating UPC-A Barcode.

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UPC-A Java Barcode Generator/Class Library - TarCode.com
UPC-A barcode generator can print UPC-A and saved it as GIF and JPEG images using Java class library. Generated UPC-A barcode images can be displayed ...

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