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setupUi( this ); } The name and number properties are implemented in the same way In Listing 2-9, the name property is shown The setter, setName, is trivial, simply passing on the value to the right QLineEdit The getter, name, is slightly more complex Instead of simply returning the text from the line edit, it removes any occurrences of double dashes ("--") using replace All occurrences of double dashes are replaced by an empty string, which is the same thing as removing them They have to be removed because the name and number are divided by double dashes in the list dialog, and the editing slot, editItem (see Listing 2-9), relies on that Before returning the double dash-free string, it also calls trimmed to remove any white space left trailing at the end of the text This prevents the user from accidentally leaving spaces or tabs after the name.

By specifying the socket option SO_REUSEADDR, you are indicating that your application is okay about owning a port whose old connections might still be shutting down out on some client on the network In practice, I always use SO_REUSEADDR when writing server code without putting thought into it, and have never had any problems..

Listing 2-9 Editing an item of the list const QString EditDialog::name() const { return uinameEdit->text()replace("--","")trimmed(); } void EditDialog::setName( const QString &name ) { uinameEdit->setText( name ); }.

ashups are inspiring a new generation of technology enthusiasts and programmers. Mashups enable experienced, web savvy programmers to integrate with the giants of the Web 2.0 space. As the name implies, mashups mix and mash the programming interfaces from different companies products and services to create new products and services. Yahoo, Google, Amazon, eBay, and Microsoft have published application programming interfaces (APIs) based on web standards that allow you to utilize their complicated functionality without being a programming expert. Dozens more companies, big and small, have followed in the same way, creating a mashup explosion of API mixing and matching. New, sometimes strange, mashup creations pop up all the time. In this chapter, I will explain what mashups are and give you a brief history of how mashups evolved and what technologies are used to create mashups. I will also give you a small sample of the dozens of products, services, and resources that are available to make mashups.

As was explained in 2 when we discussed UDP, the IP address that you pair with a port number when you perform a bind() operation tells the operating system which network interfaces you are willing to receive connections from. The example invocations of Listing 3 1 used the localhost IP address 127.0.0.1, which protects your code from connections originating on other machines. You can verify this by running Listing 3 1 in server mode as shown previously, and trying to connect with a client from another machine: $ python tcp_sixteen.py client 192.168.5.130 Traceback (most recent call last): ... socket.error: [Errno 111] Connection refused You will see that the server Python code does not even react; the operating system does not even inform it that an incoming connection to its port was refused. (Note that if you have a firewall running on your machine, the client might just hang when it tries connecting, rather than getting a friendly Connection refused that tells it what is going on!) But if you run the server with an empty string for the hostname, which tells the Python bind() routine that you are willing to accept connections through any of your machine s active network interfaces, then the client can connect successfully from another host (the empty string is supplied by giving the shell these two double-quotes at the end of the command line): $ python tcp_sixteen.py server "" Listening at ('0.0.0.0', 1060) We have accepted a connection from ('192.168.5.10', 46090) Socket connects ('192.168.5.130', 1060) and ('192.168.5.10', 46090) The incoming sixteen-octet message says 'Hi there, server' Reply sent, socket closed Listening at ('0.0.0.0', 1060)

The number property s implementation looks identical to the implementation of the name property. The only difference is the name of the QLineEdit involved: nameEdit is used for the name and numberEdit for the number.

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