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You ll notice that the web service doesn t expose web methods in a typical manner. In this case, the web service is derived from DataService, and the methods are attributed using [DataObjectMethod]. These are used by the ObjectDataSource control to expose methods that are treated as Select, Insert, Update, or Delete. For more information about these, take a look at MSDN (in particular at http://msdn2. microsoft.com/en-us/library/57hkzhy5.aspx). Also note that for the sake of simplicity, this example uses an in-memory data source, which is a static array of SampleRow objects. This makes it a stateful web service, which typically isn t good practice! Now let s look at the data source control and how it is used to bind the HTML list to this data so that you can get results like those you saw in Figure 8-3. Let s start by looking at the HTML for the page: <div id="dataContents"> </div> <div style="visibility:hidden;display:none"> <div id="masterTemplate"> <div id="masterItemTemplate"> Row <span id="masterIndex"></span>   <b><span id="masterName"></span></b><br /> <span id="masterDescription"></span><br /> </div><br/> </div> <div id="masterNoDataTemplate">No data</div> </div> This defines two <div> elements. The first is dataContents, which will contain the rendered results. The second is masterTemplate, which defines the template for how the data will appear. Both of these elements will have Atlas client controls mapped to them. Let s look at the Atlas Script code that maps to these elements and binds to the data source: <script type="text/xml-script"> <page xmlns:script="http://schemas.microsoft.com/xml-script/2005"> <components> <dataSource id="dataSource" serviceURL="SampleDataService.asmx" propertyChanged="onChange"/> <listView id="masterRepeater" targetElement="dataContents" itemTemplateParentElementId="masterTemplate" propertyChanged="onChange"> <bindings> <binding dataContext="dataSource" dataPath="data" property="data"/> </bindings>

The HTTP protocol sounds simple enough: each request names a document (which can be an image or program or whatever), and responses are supposed to supply its content. But the reality, of course, is rather more complicated, as its main features to support the modern Web have driven its specification, RFC 2616, to nearly 60,000 words. In this chapter, we tried to capture its essence in around 10,000 words and obviously had to leave things out. Along the way, we discussed (and showed sample Python code) for the following concepts:

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For this example to work, you need Microsoft SQL Server (2000 or 2005), Microsoft SQL Desktop Engine, or Microsoft SQL Server Express If you aren t familiar with the commands and objects used for data access, the code has been included for you to use You can find the code samples for this book in the Source Code area of the Apress website (http://wwwapresscom) You might also want to check out Pro ADONET 20 by Sahil Malik (Apress, 2005) for more ADONET information Finally, for some of the chapter examples and for the Employee Performance Review application in 10, you might need access to a Web server running Internet Information Server (IIS) VS has a built-in Web server that you can use for local testing and development that might work just fine for you.

exchange mail only with trusted servers, then lack of authentication is clearly a problem warranting an error message; but for a general-purpose client, it probably merits a warning instead. Listing 13 5 acts as a TLS-capable general-purpose client. It will connect to a server and use TLS if it can; otherwise, it will fall back and send the message as usual. (But it will die with an error if the attempt to start TLS fails while talking to an ostensibly capable server!) Listing 13 5. Using TLS Opportunistically #!/usr/bin/env python # SMTP transmission with TLS - 13 - tls.py import sys, smtplib, socket if len(sys.argv) < 4: print "Syntax: %s server fromaddr toaddr [toaddr...]" % sys.argv[0] sys.exit(2) server, fromaddr, toaddrs = sys.argv[1], sys.argv[2], sys.argv[3:] message = """To: %s From: %s Subject: Test Message from simple.py Hello, This is a test message sent to you from the tls.py program in Foundations of Python Network Programming. """ % (', '.join(toaddrs), fromaddr) try: s = smtplib.SMTP(server) code = s.ehlo()[0] uses_esmtp = (200 <= code <= 299) if not uses_esmtp: code = s.helo()[0] if not (200 <= code <= 299): print "Remove server refused HELO; code:", code sys.exit(1) if uses_esmtp and s.has_extn('starttls'): print "Negotiating TLS...." s.starttls() code = s.ehlo()[0] if not (200 <= code <= 299): print "Couldn't EHLO after STARTTLS" sys.exit(5) print "Using TLS connection." else: print "Server does not support TLS; using normal connection." s.sendmail(fromaddr, toaddrs, message) except (socket.gaierror, socket.error, socket.herror, smtplib.SMTPException), e: print " *** Your message may not have been sent!" print e sys.exit(1)

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