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QObject::connect( &bar, SIGNAL(writeText(TextAndNumber)), &device, SLOT(write(TextAndNumber)) ); ... } The changes to the TextDevice class are limited to the write slot. The slot, shown in Listing 12-34, now accepts a TextAndNumber object as argument instead of a QString. It prints its own counter value, the received text, and the received number. Listing 12-34. The TextDevice s write slot accepting a TextAndNumber object as argument void TextDevice::write( TextAndNumber tan ) { QMutexLocker locker( &m_mutex ); qDebug() << QString( "Call %1 (%3): %2" ) .arg( m_count++ ) .arg( tan.text ) .arg( tan.number ); } The TextThread class has received slightly more changes, which can be seen in the run method shown in Listing 12-35. First, the signal emitted now carries a TextAndNumber argument here you use the convenient constructor mentioned earlier. The other change is that each text thread now has a local counter, which is updated in the emit call and is not protected by any mutex because it is used in only one thread. Listing 12-35. The TextThread run method now updates a counter and emits a TextAndNumber object instead of a QString. void TextThread::run() { while( !m_stop ) { emit writeText( TextAndNumber( m_count++, m_text ) ); sleep( 1 ); } } Running the application described gives a result similar to the one shown in Listing 12-36. The calls are counted by the TextDevice object while the number of occurrences of each string is counted by each TextThread object. As you can see, the order of the text threads is not controlled. Listing 12-36. Running the text thread application with a thread local counter "Call 0 (0): Foo" "Call 1 (0): Bar" "Call 2 (1): Bar"

) Next, this simple server uses the bind() command to request a UDP network address, which you can see is a simple tuple containing an IP address (a hostname is also acceptable) and a UDP port number At this point, an exception could be raised if another program is already using that UDP port and the server script cannot obtain it Try running another copy of the server you will see that it complains: $ python udp_localpy server Traceback (most recent call last): .. socketerror: [Errno 98] Address already in use Of course, there is some very small chance that you got this error the first time you ran the server, because port 1060 was already in use on your machine It happens that I found myself in a bit of a bind when choosing the port number for this first example.

Now that you ve seen how the editor can help you complete your Block Definition XML file, you re ready to look at the complete definition in Listing 9-3. Notice the area under keys, which sets up things for the PRE. It indicates the XML element that will be used for storing and retrieving the key in your JavaScript code, so we can now uncomment the section of code that uses the API key and replace it with the following code:

3 (1): Foo" 4 (2): Foo" 5 (2): Bar" 6 (3): Bar" 7 (3): Foo" 8 (4): Foo" 9 (4): Bar" 10 (5): Foo" 11 (5): Bar" 12 (6): Foo" 13 (6): Bar"

It had to be above 1023, of course, or you could not have run the script without being a system administrator and, while I really do like my little example scripts, I really do not want to encourage anyone running them as the system administrator! I could have let the operating system choose the port number (as I did for the client, as we will see in a moment) and had the server print it out and then made you type it into the client as one of its.

The QMap and QHash classes store one item for each key. When you want to have a list of items for each key, you can use QMultiMap and QMultiHash. These classes relate to each other just as QMap relates to QHash key order is preserved in the map; hashes are quicker but order the keys arbitrarily. This section discusses the QMultiMap class, but all that I say also applies to the QMultiHash class. The QMultiMap class does not have a [] operator; instead, the insert method is used for adding values and the method values for accessing the inserted items. Because the QMultiMap can contain multiple elements for a key, the values method returns a QList with the items associated with the given key. Before requesting a list, it is possible to see how many items are associated to a given key using the count method.

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