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implementation to implementation, depending on how your media is accessed, how the container format is parsed, and how you extract or otherwise obtain metadata information about the media. However you choose to implement that functionality, note that logically the media initialization is complete only after your code calls MediaStreamSource.ReportOpenMediaCompleted(). As we noted while discussing the asynchronous nature of the MediaStreamSource API, you can return from OpenMediaAsync() and then call ReportOpenMediaCompleted() asynchronously from elsewhere in your MediaStreamSource implementation, or you can call it synchronously from your OpenMediaAsync() implementation. It is worth looking at the information that is expected to be passed in as parameters to ReportOpenMediaCompleted(). These parameters are the mechanism through which you need to pass metadata about the media from your MediaStreamSource implementation to the MediaElement. The method signature for ReportOpenMediaCompleted() is as follows: void ReportOpenMediaCompleted( IDictionary<MediaSourceAttributesKeys, string> mediaSourceAttributes, IEnumerable<MediaStreamDescription> availableMediaStreams); The first parameter is a dictionary of attributes for the overall media source that you are exposing to the MediaElement and appropriate values for each of these attributes. If you look at the System.Windows.Media.MediaSourceAttributesKeys enumeration, you find the following enumerated values: MediaSourceAttributesKeys.CanSeek: Use this as a key in the mediaSourceAttributes parameter to pass in either the string true or the string false depending on whether you allow seeking through the media in your MediaStreamSource implementation. MediaSourceAttributesKeys.Duration: Use this to pass in the total duration of the media. Note that the duration is specified as ticks formatted as a string, where one tick is a unit of time measured as 100 nanoseconds. MediaSourceAttributesKeys.DRMHeader: This consists of digital rights management (DRM) header information for right-protected content.

The second parameter, availableMediaStreams, is a collection of System.Windows.Media.MediaStreamDescription instances. Note that your media source may contain more than one media stream. For example, a media file that represents a video clip may include one video stream along with one or more audio streams, with each audio stream representing an audio track for the video in a different language. For each of these streams that you want the MediaElement to play, you must describe the stream using an instance of the MediaStreamDescription added to the availableMediaStreams parameter to ReportOpenMediaCompleted(). The MediaStreamDescription type is shown here: public class MediaStreamDescription { // Methods public MediaStreamDescription(MediaStreamType type, IDictionary<MediaStreamAttributeKeys, string> mediaStreamAttributes); // Properties public IDictionary<MediaStreamAttributeKeys, string> MediaAttributes { get; } public int StreamId { get; }

Note arg is the type of java.util.Map that is be used to transmit data to another ZUL page dynamically created using Execustions.createComponents().

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In the sample code, you start with the code from Recipe 2-3, which includes a form that saves and loads data from isolated storage. You will save and load data from isolated storage while the background worker thread is executing to prove that the UI is not locked up by the long-running operation. You ll modify the UI to include a button to start the long-running operation as well as a bit of UI work to show what is going on. Figure 2-15 shows the UI.

To help keep things clean, the code that was copied from Recipe 2-3 is located in #region blocks so that it is not a distraction. There is a bit more code in this recipe, so let s walk through the major code sections. First, you declare a BackGroundWorker object named worker and initialize it in the constructor Page() for the Page class: worker.WorkerReportsProgress = true; worker.WorkerSupportsCancellation = true; worker.DoWork += new DoWorkEventHandler(worker_DoWork); worker.ProgressChanged += new ProgressChangedEventHandler(worker_ProgressChanged); worker.RunWorkerCompleted += new RunWorkerCompletedEventHandler(worker_RunWorkerCompleted); You configure the BackgroundWorker to support cancellation and progress reporting so that you can provide a simple UI to give status. Next, you wire up the DoWork, ProgressChanged, and RunWorkerCompleted events to handlers.

The DoWork event contains the code that the BackgroundWorker thread executes This is where the long-running operation goes ProgressChanged and RunWorkerCompleted are events where the UI thread can update status in the UI while the background work is safely executing In your DoWork event, you first check to see if there is a cancel request pending and break out of the loop if there is Otherwise, you call ThreadSleep to delay execution and ReportProgress to provide an updated percentage complete The results of the background worker thread s effort are passed back to the main thread as the value of eResult: eResult = EnvironmentNewLine + "Completed: " + DateTimeNowToString(); In your case, you simply pass back a string, but in a scenario with real background work, this could be a collection of data or objects received over the network.

almost everyone could solve, but some of them solved it as quickly as they could write while others took a while, and Professor Lang claimed that all of the students who solved the problem as quickly as they could write would get an A in the Calculus course, and all the others wouldn t. The speed with which they solved a simple algebra problem was as good a predictor of the final grade in Calculus as a whole semester of homework, tests, midterms, and a final.2 You see, if you can t whiz through the easy stuff at 100 mph, you re never gonna get the advanced stuff.3 But like I said, the good programmers stand up, write the answer on the board, sometimes adding a clever fillip (Ooh! Unicode compliant! Nice!), and it takes thirty seconds, and now I have to decide if they re really good, so I bring out the big guns: recursion and pointers.

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