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You will find them in the telnetlib Standard Library documentation including an interact() method that lets the user talk directly over your Telnet connection using the terminal! This kind of call was very popular back in the old days, when you wanted to automate login but then take control and issue normal commands yourself The Telnet protocol does have a convention for embedding control information, and telnetlib follows these protocol rules carefully to keep your data separate from any control codes that appear So you can use a Telnet object to send and receive all of the binary data you want, and ignore the fact that control codes might be arriving as well But if you are doing a sophisticated Telnet-based project, then you might need to process options Normally, each time a Telnet server sends an option request, telnetlib flatly refuses to send or receive that option.

To create this mashup, you need a Flickr account. You can get one by going to Flickr s home page (http://www.flickr.com). Click Create an Account, and enter an existing Yahoo ID or create a new one. After you create your account, you can upload and tag your own photos. For the purposes of creating this mashup, I won t be covering that here. There are already millions of photos we can search.

10.

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But you can provide a Telnet object with your own callback function for processing options; a modest example is shown in Listing 16 4 For most options, it simply re-implements the default telnetlib behavior and refuses to handle any options (and always remember to respond to each option one way or another; failing to do so will often hang the Telnet session as the server waits forever for your reply) But if the server expresses interest in the terminal type option, then this client sends back a reply of mypython, which the shell command it runs after logging in then sees as its $TERM environment variable Listing 16 4 How to Process Telnet Option Codes #!/usr/bin/env python # Foundations of Python Network Programming - 16 - telnet_codes.

The using statement helps reduce the potential problem of an unexpected runtime error by neatly packaging the use of a resource. There are two forms of the using statement. The first form is the following, and is illustrated in Figure 9-11. The code between the parentheses allocates the resource. The Statement is the code that uses the resource. The using statement implicitly generates the code to dispose of the resource. using ( ResourceType Identifier = Expression ) Statement Allocates resource Uses resource Unexpected runtime errors are called exceptions, and are covered in 11. The standard way of handling the possibility of exceptions is to place the code that might cause an exception in a try block, and place any code that must be executed, whether or not there is an exception, into a finally block. This form of the using statement does exactly that. It performs the following: Allocates the resource Places the Statement in a try block Creates a call to the resource s Dispose method and places it in a finally block.

py # How your code might look if you intercept Telnet options yourself from telnetlib import Telnet, IAC, DO, DONT, WILL, WONT, SB, SE, TTYPE.

Once you have a Flickr account set up, you re ready to start creating your mashup in Popfly. You ll add three blocks: Flickr, User Input, and PhotoSphere.

The following code uses the using statement twice once with a class called TextWriter, and once with a class called TextReader, both from the System.IO namespace. Both classes implement the IDisposable interface, as required by the using statement. The TextWriter resource opens a text file for writing and writes a line to the file. The TextReader resource then opens the same text file, and reads and displays the contents, line by line. In both cases, the using statement makes sure that the objects Dispose methods are called. Notice also the difference between the using statements in Main and the using directives on the first two lines. using System; using System.IO; // using DIRECTIVE; not using statement // using DIRECTIVE; not using statement

process_option(tsocket, command, option): if command == DO and option == TTYPE: tsocket.sendall(IAC + WILL + TTYPE) print 'Sending terminal type "mypython"' tsocket.sendall(IAC + SB + TTYPE + '\0' + 'mypython' + IAC + SE) elif command in (DO, DONT): print 'Will not', ord(option) tsocket.sendall(IAC + WONT + option) elif command in (WILL, WONT): print 'Do not', ord(option) tsocket.sendall(IAC + DONT + option) # uncomment this for debugging messages

t = Telnet('localhost') # t.set_debuglevel(1)

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