Simple .NET/ASP.NET PDF document editor web control SDK

Adding coordinates as shown in Figure 6-4 is not an original idea by any means, as any point on this planet can be expressed in terms of longitude and latitude. What is different about the coordinates in Figure 6-4 is that they do not apply to the lines; they apply to the map pieces. In this example, the view port would be loaded with the map pieces with the coordinates (2,1), (2,2), (3,1), and (3,2). Identifying and loading the individual map pieces does not make a complete Web application. If you have ever used http://map.search.ch or http://maps.google.com, you know that scrolling a map results in very little lag time. Scrolling a map through the view port is smooth, not jerky. To optimize and make the scrolling look smooth, a look-ahead has to be executed. In the case of the images, the look-ahead uses the img tag. The look-ahead of Figure 6-4 would preload the map pieces (1,0), (1,1), (1,2), (1,3), (2,0), (3,0), (4,0), (4,1), (4,2), (4,3), (3,3), and (2,3). Loading all of these pieces might take some time, and by preloading the map pieces, a cache is created that speeds up the application. You need to define what the look-ahead algorithm will be, and then load those pieces. Using a look-ahead algorithm is a good idea, because the time taken for someone to view the pieces and then react involves a slight delay, giving the application time to look ahead and see what should be loaded.

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## set the variable MY_APPS to an array populated with a directory listing of /Applications declare -a MY_APPS=(/Applications/*.app)

Invocation request3 = new Invocation("file:///SDCard/BlackBerry/game1.dat"); String[] args = new String[]{"UpdateHighScore", "Chris", "500"}; request3.setArgs(args); InputStream iconStream = getClass().getResourceAsStream("player.png"); byte[] iconData = null; try { iconData = new byte[iconStream.available()]; iconStream.read(iconData); } catch (Exception e) {} request3.setData(iconData);

You can then iterate through these items with a for loop:

The mapping example shows what you need to do to manage large or infinite data sets, although all applications that work with large or infinite data sets have the following common attributes on the client side: The referencing of all data can be defined In the case of the mapping application, this means assigning coordinates to all map pieces You want the data to be prefixed with a reference so that the client can jump to the data using a calculated URL approach This does not mean that data available is at the URL, as the server side might not yet have generated that data The references can be timestamps, coordinates, or an incremental counter, but they must possess the ability to be determined before the data is loaded The client will directly reference the view port data and the data that will probably be viewed.

The combination of binary message support and the ability to direct messages to particular applications can make text messages an attractive data delivery vehicle. Consider, for example, writing a play-by-SMS chess game. Both players would have a copy of the app on their phone showing the board. Whenever a move is made, the game sends the details of that move to the opponent s phone number. When that phone receives the move, it notifies the user and updates their local view of the board. This game takes advantage of the store-and-forward design of existing SMS infrastructure, so if one player s phone is turned off, the message will wait until the phone becomes available. The following code demonstrates how to construct and send such a binary SMS message.

There are a few things to note in this code. In our for statement, we quote the array string ${MY_APPS[@]} to ensure that individual items with spaces or tabs in the data are escaped. When accessing a specific index in an array, the curly braces are always needed and the index number specified inside them. For instance, here s how to access the first item list in our applications:

${MY_APPS[1]}.

MessageConnection smsConnection = (MessageConnection)Connector.open ("sms://+14155550100:5000"); BinaryMessage chessMove = (BinaryMessage)smsConnection.newMessage (MessageConnection.BINARY_MESSAGE); byte[] move = new byte[]{1, 3, 4, 'k', 3, 5}; chessMove.setPayloadData(move); smsConnection.send(chessMove);

You can also assign arrays using numeric methodology as well:

The data that will probably be viewed is the look-ahead data that is preloaded The algorithm to determine the data that is probably going to be viewed is completely dependent on the application and the user interface of the application For example, most mapping applications have an arrow to move the map up and down by one map piece If a user interface were to offer an arrow called Jump 100 Units, then the selection that is probably going to be viewed would include the immediate as well as the Jump 100 Units map pieces The idea behind the data that is probably going to be viewed is to let the client or server preload the information, which makes the iteration of the data seem like one smooth process In our case, we are building a stock ticker viewing application.