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private private private private int _frameTime = 0; const int _frameWidth = 320, _frameHeight = 200; const int _framePixelSize = 4; const int _frameBufferSize = _frameHeight * _frameWidth * _framePixelSize; private const int _frameStreamSize = _frameBufferSize * 100; private MemoryStream _frameStream = new MemoryStream(_frameStreamSize); private MediaStreamDescription _videoDesc; private void PrepareVideo() { _frameTime = (int)TimeSpan.FromSeconds((double)1/30).Ticks; Dictionary<MediaStreamAttributeKeys, string> streamAttributes = new Dictionary<MediaStreamAttributeKeys, string>(); streamAttributes[MediaStreamAttributeKeys.VideoFourCC] = "RGBA"; streamAttributes[MediaStreamAttributeKeys.Height] = _frameHeight.ToString(); streamAttributes[MediaStreamAttributeKeys.Width] = _frameWidth.ToString(); _videoDesc = new MediaStreamDescription( MediaStreamType.Video, streamAttributes); } protected override void OpenMediaAsync() { Dictionary<MediaSourceAttributesKeys, string> sourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>(); List<MediaStreamDescription> availableStreams = new List<MediaStreamDescription>(); PrepareVideo(); availableStreams.Add(_videoDesc); sourceAttributes[MediaSourceAttributesKeys.Duration] = TimeSpan.FromSeconds(0).Ticks.ToString( CultureInfo.InvariantCulture); sourceAttributes[MediaSourceAttributesKeys.CanSeek] = false.ToString(); ReportOpenMediaCompleted( sourceAttributes, availableStreams); }

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Regex r = new Regex("^display", RegexOptions.IgnoreCase);

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Creating the service class The next step is to implement the SocketListener service class. This is where all the socket listener behavior will be encapsulated. Listening for messages is slightly different than sending messages because the listener can never be sure of when or if the client will attempt to connect. As a result, if we simply listened for the connection and the data to be sent on the same thread that the application is running on, our application would appear to hang until the connection was terminated. For this reason, it is best to implement the connection listening part of the application on a separate thread. This allows the application to continue functioning while waiting and receiving messages. By handling messages on a separate thread, the data received by the message handler can be displayed immediately as well, rather than having to wait until the connection finished transmitting data. This is especially important if two devices require that the users provide input during the data exchange. If a separate thread is not used, a connection would need to be established each time the user entered a piece of data, since the connection and the data entry must share the same thread. The SocketListener class extends Thread to provide the ability to create and run the listener on its own thread.

To recycle the application pools from the Visual Studio 2010 interface, install the CKS:DEV extensions using Visual Studio 2010 Extensions Manager. Then choose Tools > CKSDEV > Recycle All SharePoint Application Pools to recycle the application pools. Download it through the Visual Studio Extension Manager.

In the output of Example 16-6, the stack trace lists the methods in the reverse order in which they were called; by reviewing this order, you can infer that the exception was thrown in DoDivide( ), which was called by Run( ). When methods are deeply nested, the stack trace can help you understand the order of method calls and thus track down the point at which the exception occurred, and how you got there, if your method is called from several different points in the application. In this example, rather than simply throwing a DivideByZeroException, you create a new instance of the exception object:

Many application commands also take a direct parameter, which immediately follows the command s name and has no label of its own. For example, you ve already seen how TextEdit s open command takes an alias value (or list of aliases) as its direct parameter: tell application "TextEdit" open alias "Macintosh HD:Users:hanaan:Notes.txt" end tell Many application commands take a reference as their direct parameter and use this reference to identify the application object (or objects) on which the command should operate. For example: tell application "TextEdit" close document 1 end tell

summarizing an entire branch of computer science in only a few pages, we strongly recommend the resources listed in the bibliography as further reading.

This chapter describes problems known as gaps and islands and their solutions. I start out with a description of gaps and islands problems, describe the common variations on the problems, and provide sample data and desired results. Then I move on to ways of handling gaps and islands problems, covering multiple solutions to each problem and discussing both their logic and performance. The chapter concludes with a summary of the solutions.

The motors are running in opposite directions, so we don't move, we just rotate about the center of the rig ((LeftMotorState == MotorState.Running && RightMotorState == MotorState.Reversed) || (LeftMotorState == MotorState.Reversed && RightMotorState == MotorState.Running)) return Rotate(duration);

Dock is also an attached property, as we talked about when discussing the Canvas in section 4.2.3, and can be set to Top, Bottom, Left, or Right. The order in which the con-

my ($test_string, $space_string, $n_spaces); BEGIN { $test_string .= chr($_) for (0x21 .. 0x7e); $space_string = $test_string; $n_spaces = $space_string =~ s/(.{5})(.{5})/$1 $2/g; } sub _set_font_params parameters { my $self = shift; my @bb1 = GD::Image->stringTTF(0, $self->{font}, $self->{font_size}, 0, 0, 0, $test_string); my @bb2 = GD::Image->stringTTF(0, $self->{font}, $self->{font_size}, 0, 0, 0,

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