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Some of the driving forces shown in the table couple tightly with the throughput issues of data communications However, speed is not the only issue driving the demand for mobility The need for speed and reliability are rapidly driving the users into a mobile environment In the older days, the speed would hold back the use and acceptance of data transmission Popularity in other connection devices also set the pace An example of the devices is shown in Table 23-2 This lists the various devices people are looking to use Table 23-2: Speeds for wireless devices Devices Expected Speeds Personal Data Assistants Current wireless connection is 288 Kbps Expect this to grow to 1 Mbps by the end of 2000 Laptop Computers Current modem technology supports up to 56 Kbps downloadable and 336 Kbps uploadable In the future, users will expect 2 10 Mbps Same technology as laptops Current low-speed telephony with speeds of less than 192 Kbps circuit-switched technology Future will be on demand at speeds of up to 128 Kbps and then 1 Mbps Low speed data from short messaging systems

At this point, we have a problem. Actually, we have two problems. The first is that our business logic now lives in the UI. Some form class somewhere is deciding whether or

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not it s OK to print a document. If we want to print from somewhere besides the print button, perhaps from a menu, we re likely to either miss this security check, or we ll end up copying and pasting code a serious offense. The second problem is that, at some point, someone is going to want to use automation to tell the application to print, or a customer is going to want to use an API to control the application, and the only API we now have is the UI. We also have a fair number of other minor problems cropping up, such as, if we throw a security exception and want to retry printing after the user enters credentials, we lose the original requests, and the users must set everything up again as they want. If this were a different type of command, such as cut or paste, we wouldn t have any way to undo that operation either. Again, via RoutedEvents, WPF has full support for this model, as you ve seen in the calculator and other examples. In fact, if you do use events for handling commands, the ability to bubble up and tunnel down makes it superior to the WinForms model because you can at least move your handlers up a few levels. But it isn t recommended for any but the most trivial of applications.

Variations in Data Communications (Wireless)

10.1.2 Son of MFC If you have any experience with MFC, you ll undoubtedly notice that the WPF command model is heavily influenced by it. Given that this is a book on WPF, we won t go into a tremendous amount of detail on the MFC implementation. If you re familiar with MFC, consider this a refresher or, if not, an interesting bit of trivia. Command routing in MFC was based around the idea of the Message Map. At a low level, everything in Windows is driven by messages. If the user clicks the mouse, a WM_LBUTTONDOWN is sent to the application, followed by a WM_LBUTTONUP. (The L is for the left button). If part of the screen needs to be repainted, a WM_PAINT message is sent. And, if a command needs to be executed, such as something from a classic Windows menu, a WM_COMMAND message is sent. In MFC, the trick was to make sure that the appropriate code got called when one of these messages was sent. This was generally done by putting a Message Map in the file, with entries for each message and command to be handled.

BEGIN_MESSAGE_MAP(CMyClass, CFrameWnd) ON_LBUTTONDOWN() ON_WMPAINT() ON_COMMAND(IDC_DoSomething, OnDoSomething) ON_COMMAND(IDC_DoSomethingElse, OnDoSomethingElse) END_MESSAGE_MAP()

Several different flavors of data communications exist for wireless communications Most people think of the services as being one type only Earlier the discussion considered the Short Message Services (SMS), circuit-switched data, and packet switched data The variations in the different technologies depend on the innovations and the air interfaces Regardless of the different methods, there are still many variations in using the data transmission characteristics with wireless applications and mobile users In Table 23-3 , a summary of the various methods is shown for the wireless communications techniques Table 23-3: Summary of methods for data Method Circuit-switched Air Interface TDMA CDMA GSM Packet Switched RIM RAM Mobile Data CDPD IP SMS Packet Switched, separate

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