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Now you have disconnected and the read is finished. All that remainsfor the HTTP object is to say everything has been done and that all went well: requestFinished( 2, False ) done( False ) In the next try, you ll attempt to download a file from a non-existing server. This means that you won t even get in contact with the server. It all starts just as before: set the host and then try to download a file: requestStarted( 1 ) requestFinished( 1, False ) requestStarted( 2 ) stateChanged( Connecting ) The second request fails: requestFinished( 2, True ) This is reflected by the done signal as well; its argument is true, indicating error: done( True ) stateChanged( Closing ) stateChanged( Unconnected ) Two scenarios were shown here, but there are many other scenarios. When dealing with network applications, be careful to report success to the user when you receive the right data. Don t try to detect all the erroneous cases; try to find the successful one you were expecting.

Figure 2-2. Namespaces within the Activities assembly The first namespace is Activities. The Activities namespace contains all the classes that make up the out-of-the-box activities that are included. Expand the Activities namespace, and you ll see classes such as Code activity, Delay activity, and IfElse activity. These are the classes that make up those activities. Click the IfElse Activity, as shown in Figure 2-3.

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When using the QHttp and QFtp classes, you re actually relying on underlying protocols to handle the actual data transfers. The protocol used is TCP which has a close relative that is slightly , less reliable called UDP Both protocols are supported by Qt. . When using TCP and UDP sockets directly, you work at a far lower level than when using HTTP and FTP When you use these technologies, you are responsible for converting the sent . and received data to and from an application-friendly format and handling the data on the application side. This means more work for you, but also more control of the resulting protocol. FTP and HTTP are not always suitable protocols because there might already be a protocol for the application field. In other cases, the advantages of using a custom protocol are greater than the extra work spent. The nature of the application sometimes means that using HTTP or FTP is impossible or involves more work than implementing an application-specific protocol.

The virtualEarthMap control contains all the code necessary to handle mouse interaction. If you hold the mouse button down on the map, you can then drag the map. This demonstrates an important principle of Ajax and Atlas, namely, that asynchronous updates can

Although there are several differences between UDP and TCP communication, most developers need to remember only their different approaches to reliability. It is crucial for TCP-transmitted data to actually reach its destination. On the other hand, when using UDP you just throw data between the computers involved the data is in no way guaranteed to reach the destination.

Also, when the data arrives at the destination, the TCP protocol ensures that the data is served to your application in the right order. Data sent using UDP can arrive out of order, which is a situation applications must handle. TCP is best if you want to transfer a piece of data and need to transfer all data for it to be useful. Examples include transferring files and maintaining sessions for remotely accessing a computer. In these scenarios, a missing piece of data renders the rest of the data useless. UDP is useful for feeding out data where timing is more important than reliability. For example, when streaming video, it is better to miss a few frames than to drift in time. Other examples include multiplayer games in which the location of other players can be less important (as long as no direct interaction takes place). Sometimes the requirements involve both the properties of TCP and UDP: One common scenario is when the control over a data stream uses TCP while the actual data is being transferred using UDP. This means that user authentication, control commands, and such are handled via a connection of guaranteed quality while the actual data is sent using UDP .

Figure 2-3. IfElse Activity class After clicking the class, you ll see the methods of that class in the right window of the Object Browser, as shown in Figure 2-4.

improve the user experience. In this case, the map you are viewing consists of a number of tiles. As you are viewing the map surface, the tiles for the surrounding areas are downloaded and cached. If you drag the map around, another download for these tiles isn t necessary. However, if you drag really fast to see areas that are far away, you ll see the Atlas Script working to catch up, caching the tiles as it goes. See Figure 10-3 for an example of this.

Historically, computer communication has taken place with a server providing a service of some kind for the clients.

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