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Listing 2 2, which we examined in the previous section, introduced another new concept that needs explanation. We have already discussed binding both the explicit bind() call that the server uses to grab the port number that it wants to use, as well as the implicit binding that takes place when the client first tries to use the socket and is assigned a random ephemeral port number by the operating system. But this remote UDP client also uses a new call that we have not discussed before: the connect() socket operation. You can see easily enough what it does. Instead of having to use sendto() and an explicit UDP address every time we want to send something to the server, the connect() call lets the operating system know ahead of time which remote address to which we want to send packets, so that we can simply supply data to the send() call and not have to repeat the server address again. But connect() does something else important, which will not be obvious at all from reading the Listing 2 2 script. To approach this topic, let us return to Listing 2 1 for a moment. You will recall that both its client and server use the loopback IP address and assume reliable delivery the client will wait forever for a response. Try running the client from Listing 2 1 in one window: $ python udp_local.py client Address before sending: ('0.0.0.0', 0) Address after sending ('0.0.0.0', 47873)

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Pdf417decode.c can decode PDF417 barcodes from a pbm file. The program is capable of decoding all three compaction modes (binary, text and numeric), and ...

In the following code, the catch clause of a previous example has been modified to specifically handle exceptions of the DivideByZeroException class. While in the other example, the catch clause would handle any exception raised in the try block, the current example will only handle those of the DivideByZeroException class. int x = 10; try { int y = 0; x /= y; // Raises an exception } Exception type catch ( DivideByZeroException ) { ... Console.WriteLine("Handling an exception."); } For example, you could further modify the catch clause to use an exception variable. This allows you to access the exception object inside the catch block. int x = 10; try { int y = 0; x /= y; // Raises an exception } Exception type Exception variable catch ( DivideByZeroException e ) { Accessing the exception variable Console.WriteLine("Message: {0}", e.Message ); Console.WriteLine("Source: {0}", e.Source ); Console.WriteLine("Stack: {0}", e.StackTrace ); } This produces the following output: Message: Attempted to divide by zero. Source: Exceptions 1 Stack: at Exceptions_1.Program.Main() in C:\Progs\Exceptions 1\Exceptions 1\ Program.cs:line 14

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Your barcode library uses java .awt.Rectangle , and as the error message states, it's a restricted class. This restriction applies to GAE only, ...

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content = response.read() open('phoenix.html', 'w').write(content) Many mechanize users instead choose to select forms by the order in which they appear in the page in which case we could have called select_form(nr=1). But I prefer not to rely on the order, since the real identity of a form is inherent in the action that it performs, not its location on a page. You will see immediately the problem with using mechanize for this kind of simple task: whereas Listing 10 1 was able to fetch the page we wanted with a single HTTP request, Listing 10 2 requires two round-trips to the web site to do the same task. For this reason, I avoid using mechanize for simple form submission. Instead, I keep it in reserve for the task at which it really shines: logging on to web sites like banks, which set cookies when you first arrive at their front page and require those cookies to be present as you log in and browse your accounts. Since these web sessions require a visit to the front page anyway, no extra round-trips are incurred by using mechanize.

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pdf417 Javascript Reading / Decoding - Stack Overflow
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The catch clauses section can contain multiple catch clauses. Figure 11-4 shows a summary of the catch clauses section.

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There is a veritable glut of online guides and published books on the subject of HTML, but a few notes about the format would seem to be appropriate here for users who might be encountering the format for the first time The Hypertext Markup Language (HTML) is one of many markup dialects built atop the Standard Generalized Markup Language (SGML), which bequeathed to the world the idea of using thousands of angle brackets to mark up plain text Inserting bold and italics into a format like HTML is as simple as typing eight angle brackets: The very strange book Tristram Shandy In the terminology of SGML, the strings and are each tags they are, in fact, an opening and a closing tag and together they create an element that contains the text very inside it.

Figure 11-4. Structure of the catch clauses section of a try statement When an exception is raised, the list of catch clauses is searched in order, and the first catch clause that matches the type of the exception object is executed. Because of this, there are two important rules in ordering the catch clauses. They are the following: The specific catch clauses must be ordered with the most specific exception types first, progressing to the most general. For example, if you declare an exception class derived from NullReferenceException, the catch clause for your derived exception type should be listed before the catch clause for NullReferenceException. If there is a general catch clause, it must be the last clause after all specific catch clauses.

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