winforms pdf 417 reader

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Figure 10-25 Layout of the file in which the screen recordings are stored Now, let s look at what happens when the timer begins raising its Tick events at the specified intervals In the handler method snapshotTimer_Tick() in Listing 10-28, you first check the value of a variable named FlushCounter, which helps you define an interval at which you save the snapshots in the current buffer to disk In the current implementation, that point is when you have recorded 1 second of content that is, when the value of FlushCounter equals that of ScreenRecorderFrameRate If FlushCounter is less than FrameRate (you do not have enough data buffered to write to disk yet), you increment FlushCounter by 1 and take the next snapshot.

In this chapter, I ve introduced you briefly to the Java Pet Store application, and then we created the ZK Pet Shop application, which replaces the Java GUI with a ZK one. The ZK Pet Shop requires less effort to implement Ajax-enabled web pages than the Java EE 5 store, since you no longer have to write control code in JavaScript; the ZK engine creates the control code. And again, ZUML, which is easy to understand and use, offers an intuitive way to create web applications. ZK also demonstrates its flexibility in this example ZK supports JavaScript, if necessary, and many convenient tools including Dojo, FCKeditor, CAPTCHA, and Google Maps.

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To ensure that the snapshot is taken at the specified FrameHeight and FrameWidth, you must make sure you appropriately shrink or stretch the snapshot to match those dimensions, no matter what the height and width of the RecordingRoot UIElement are You do that by creating a ScaleTransform, where the scale is set to match the ratio of the original dimensions of the RecordingRoot to the specified dimensions through the FrameHeight and FrameWidth properties The ScaleTransform is stored in a field named BitmapTransform for subsequent use You then create and store the WriteableBitmap snapshot of the RecordingRoot, with the ScaleTransform applied to it, into the CurrentBuffer buffer If FlushCounter has a value greater than or equal to FrameRate, you first attempt to start the process of saving the current buffer to disk.

Because you are dependent on a timer to fire this logic at regular intervals, you must be extra careful here and ensure that you never cause two overlapping attempts to write data to the disk at the same time To prevent that from happening, you try to acquire a lock before you attempt the disk write, and you proceed only if you can acquire the lock If you cannot acquire the lock, you take the snapshot as usual If you do acquire the lock, you accumulate the number of frames snapped between the last save and this one in a variable named TotalFrameCounter and then invoke the FlipBackBuffer() method Inside FlipBackBuffer(), you switch the buffer values (Buffer1 and Buffer2) between the buffer variables CurrentBuffer and FlushBuffer, such that the buffer you were using prior to this point to take snapshots is now pointed to by FlushBuffer.

You also reset CurrentBuffer and FlushCounter Depending on the value of FrameRate and how large the snapshots are, the process of writing to disk can take some time So, you use the BackgroundWorker class to delegate the work of writing the buffer to disk to a background thread After delegation, the FlipBackBuffer() method returns immediately to the UI thread, and you take more snapshots as described earlier The actual work of saving to disk is done in the BackgroundWorkerDoWork event handler, bwFlusher_DoWork() Here, you flatten each WriteableBitmap in the FlushBuffer to a byte array, join them to make one contiguous but larger byte array, and write the whole thing to the application-supplied stream available through the TempFile property After it is written, this buffer is cleared.

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