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This is the last part of the rich GUI, and you ve accomplished an Ajax web application with ZK. Though it is intuitive to develop this application using ZK , which is componentbased and event-driven, I strongly recommend that you look back at 4, which discussed a lot about the life cycles of the desktop, page, and components. You will acquire deeper understanding about ZK and be able to develop another application more rapidly.

} } }

public class MediaInfo { public int FrameRate { get; set; } public double FrameHeight { get; set; } public double FrameWidth { get; set; } public long FrameCount { get; set; } } } The RecordingRoot property indicates the UIElement that is being recorded, and FrameHeight and FrameWidth indicate the Height and Width of each frame you want to record; the latter two are set to 180 and 320 by default You expect the application using the Recorder to pass in an open stream through the TempFile property, to which the frames and related metadata are recorded; it can also optionally set the desired FrameHeight and FrameWidth before invoking the ScreenRecorderStart() method In the ScreenRecorder constructor in Listing 10-28, you pass in a parameter named FrameRate that is the time interval in ticks at which individual frames are to be recorded.

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You then initialize a DispatcherTimer instance named snapshotTimer to raise its Tick event at the interval set by the FrameRate parameter Also note the class named MediaInfo at the end of the listing This class captures necessary metadata like the frame rate, the width and height of individual frames, and the total number of frames recorded A serialized instance of this class is stored in the recorded file for later use in the MediaStreamSource The ScreenRecorder class uses two memory buffers to manage the act of capturing screenshots and writing the screenshot data to the application supplied stream These buffers are represented as two List<WriteableBitmap> typed variables named Buffer1 and Buffer2, respectively.

4. Joel Spolsky, The Perils of JavaSchools, published at www.joelonsoftware.com on December 29, 2005 (search for JavaSchools ).

The assumption is that writing the buffered bitmaps down to the stream may be a long-running process due to various IO bottlenecks, and you do not want to block the UI thread thus, the process of recording while saving the screenshots to the disk-based file As a result, the ScreenRecorder implementation attempts to perform the stream IO asynchronously while the application continues to use the recorder to keep recording bitmaps at the specified interval The two-buffer arrangement helps in this process, because you can use one buffer to keep the recording going while the other buffer is emptied into the stream You see how this works out as we dig further into the code in Listing 10-28 The process of recording starts when the application using the ScreenRecorder instance calls the Start() method You set the CurrentBuffer variable to Buffer1 and start the timer.

Summary

You also write a 10byte array named MediaInfoSizePlaceHolder in the code, at the beginning of the stream The content of the byte array is long enough to hold a 32-bit integer and is set to SystemInt32MaxValue initially But the content is not import, because it is overwritten later the purpose of this byte array is the important thing to understand When the ScreenRecorderStart() is called, you do not yet know all the metadata that is serialized into the file in the form an instance of the MediaInfo class, because you can only know the total frame count at the end of the recording process As a result, that data is written at the tail end of the file, after all the screenshots have been saved and the recording has ended.

However, as you see later, you must read and deserialize that information in the MediaStreamSource before you can begin processing the file for media consumption To aid in that process, you need to know the size of that metadata block up front The.

10-byte array you just wrote saves space at the beginning of the file where you write the size of the metadata block when you save it, measured as an integral number of bytes. To understand this better, look at a diagram of the file layout shown in Figure 10-25.

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