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complex form of doubly indirect thinking that some people just can t do, and it s pretty crucial to good programming. A lot of the script jocks who started programming by copying JavaScript snippets into their web pages and went on to learn Perl never learned about pointers, and they can never quite produce code of the quality you need. That s the source of all these famous interview questions you hear about, like reversing a linked list or detect loops in a tree structure. Sadly, despite the fact that I think that all good programmers should be able to handle recursion and pointers, and that this is an excellent way to tell if someone is a good programmer, the truth is that these days, programming languages have almost completely made that specific art unnecessary. Whereas ten years ago it was rare for a computer science student to get through college without learning recursion and functional programming in one class and C or Pascal with data structures in another class, today it s possible in many otherwise reputable schools to coast by on Java alone.4

using System.Windows.Threading; namespace Recipe10_7 { public class ScreenRecorder { private DispatcherTimer snapshotTimer = new DispatcherTimer(); List<WriteableBitmap> Buffer1 = new List<WriteableBitmap>(); List<WriteableBitmap> Buffer2 = new List<WriteableBitmap>(); List<WriteableBitmap> CurrentBuffer = null; List<WriteableBitmap> FlushBuffer = null; private long TotalFrameCounter = 0; private long FlushCounter = 0; private double RenderHeight; private double RenderWidth; private object WriterLock = new Object(); private MediaInfo Info = new MediaInfo(); private Transform BitmapTransform = null; private int FrameRate = default(int); private Stream _TempFile = null; public Stream TempFile { get { return _TempFile; } set { _TempFile = value; } } private UIElement _RecordingRoot = default(UIElement); public UIElement RecordingRoot { get { if (_RecordingRoot == null) _RecordingRoot = Application.Current.RootVisual; return _RecordingRoot; } set { _RecordingRoot = value; } } private double _FrameHeight = 180;

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public double FrameHeight { get { return _FrameHeight; } set { _FrameHeight = value; } } private double _FrameWidth = 320; public double FrameWidth { get { return _FrameWidth; } set { _FrameWidth = value; } } public ScreenRecorder(int FrameRate) { this.FrameRate = FrameRate; snapshotTimer.Interval = new TimeSpan(1000*10000/FrameRate); snapshotTimer.Tick += new EventHandler(snapshotTimer_Tick); } public void Start() { CurrentBuffer = Buffer1; snapshotTimer.Start(); if (TempFile != null) { byte[] MediaInfoSizePlaceHolder = BitConverter.GetBytes(Int32.MaxValue); TempFile.Write(MediaInfoSizePlaceHolder, 0, MediaInfoSizePlaceHolder.Length); }

} public void Stop() { if (snapshotTimer != null && snapshotTimer.IsEnabled) snapshotTimer.Stop(); if (TempFile != null) { lock (WriterLock) { TempFile.Flush(); MediaInfo Info = new MediaInfo { FrameCount = TotalFrameCounter, FrameHeight = this.FrameHeight, FrameWidth = this.FrameWidth, FrameRate = this.FrameRate }; DataContractSerializer ser = new DataContractSerializer(typeof(MediaInfo)); MemoryStream ms = new MemoryStream(); ser.WriteObject(ms, Info); ms.Flush(); Byte[] Buff = ms.GetBuffer(); TempFile.Write(Buff, 0, Buff.Length); TempFile.Seek(0L, SeekOrigin.Begin); Byte[] BuffLength = BitConverter.GetBytes(Buff.Length); TempFile.Write(BuffLength, 0, BuffLength.Length); TempFile.Close(); } } } void snapshotTimer_Tick(object sender, EventArgs e) { if (FlushCounter + 1 > FrameRate && Monitor.TryEnter(WriterLock)) { TotalFrameCounter += FlushCounter; FlipBackBuffer(); Monitor.Exit(WriterLock); } else FlushCounter++; if (RenderHeight == 0 || RenderWidth == 0) { RenderWidth = (int)RecordingRoot.RenderSize.Width; RenderHeight = (int)RecordingRoot.RenderSize.Height;

if (RenderHeight != 0 && RenderWidth != 0) BitmapTransform = new ScaleTransform() { CenterX = 0, CenterY = 0, ScaleY = FrameHeight / RenderHeight, ScaleX = FrameWidth / RenderWidth }; } if (RenderHeight != 0 && RenderWidth != 0) { WriteableBitmap capture = new WriteableBitmap(RecordingRoot, BitmapTransform); CurrentBuffer.Add(capture); } } private void FlipBackBuffer() { CurrentBuffer = (CurrentBuffer == Buffer1) Buffer2 : Buffer1; FlushBuffer = (FlushBuffer == Buffer1) Buffer2 : Buffer1; CurrentBuffer.Clear(); FlushCounter = 0; if (TempFile != null) { BackgroundWorker bwFlusher = new BackgroundWorker(); bwFlusher.DoWork += new DoWorkEventHandler(bwFlusher_DoWork); bwFlusher.RunWorkerAsync(FlushBuffer); } return; } void bwFlusher_DoWork(object sender, DoWorkEventArgs e) { lock (WriterLock) { List<WriteableBitmap> Buffer = e.Argument as List<WriteableBitmap>; byte[] Flattened = null; int PixelCount = (int)FrameHeight * (int)FrameWidth; for (int i = 0; i < Buffer.Count; i++) { Flattened = Buffer[i].Pixels. SelectMany((p) => BitConverter.GetBytes(p)).ToArray(); TempFile.Write(Flattened, 0, Flattened.Length); } TempFile.Flush(); Buffer.Clear();

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