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The CA (cross application) modules or components include all R/3 functions and tools which are not directly related to a unique part of the system. These are ...
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Stop(); }); In handling the Checked event, you first create and show a SaveFileDialog instance to allow the user to pick a file to save the recording to (SaveFileDialog is covered in more detail in 2) You then open the file and set the RecorderTempFile property to the file stream, assuming that Recorder is an instance of the ScreenRecorder type that you created earlier in the MainPage codebehind Finally, you begin recording by invoking the RecorderStart() method In the Unchecked event handler, you invoke RecorderStop() Figure 10-26 shows the application UI with the Record check box checked..

winforms upc-a reader

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Now that you have seen how to create the custom video file, let s look at the MediaStreamSource implementation. Listing 10-30 shows the code for the implementation in a class named BitmapToVideoMediaStreamSource in a project named BitmapToVideoMSS. Listing 10-30. Custom MediaStreamSource Implementation using using using using using using using System; System.Collections.Generic; System.IO; System.Linq; System.Runtime.Serialization; System.Windows.Media; System.Threading;

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namespace Recipe10_7 {

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public class BitmapToVideoMediaStreamSource : MediaStreamSource { public Stream MediaStream { get; set; } internal MediaInfo mediaInfo { get; set; } Dictionary<MediaStreamAttributeKeys, string> mediaStreamAttributes = new Dictionary<MediaStreamAttributeKeys, string>(); Dictionary<MediaSourceAttributesKeys, string> mediaSourceAttributes = new Dictionary<MediaSourceAttributesKeys, string>(); List<MediaStreamDescription> mediaStreamDescriptions = new List<MediaStreamDescription>(); Dictionary<MediaSampleAttributeKeys, string> mediaSampleAttributes = new Dictionary<MediaSampleAttributeKeys, string>(); private private private private private long lastFrame = 0; long FrameSize = 0; double FrameDuration = 0; int HdrSizeByteLength = BitConverter.GetBytes(Int32.MaxValue).Length; int HdrByteLength = 0;

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I might ask someone, say, to project a triangle onto a plane, a typical graphics problem, and I don t mind helping them with the trig (SOHCAH-TOA, baby!), and when I ask them how to speed it up, I might drop little hints about lookup tables. Notice that the kinds of hints I m happy to provide are really just answers to trivia questions the kinds of things that you find on Google. Inevitably, you will see a bug in their function. So we come to question five from my interview plan: Are you satisfied with that code You may want to ask, OK, so where s the bug The quintessential Open-Ended Question From Hell. All programmers make mistakes, there s nothing wrong with that, they just have to be able to find them. With string functions in C, most college kids forget to nullterminate the new string. With almost any function, they are likely to have off-by-one errors. They will forget semicolons sometimes. Their function won t work correctly on 0 length strings, or it will GPF if malloc fails ... Very, very rarely, you will have a candidate write code that doesn t have any bugs the first time. In this case, this question is even more fun. When you say, There s a bug in that code, they will review their code carefully, and then you get a chance

private BitmapToVideoMediaStreamSource() { } public BitmapToVideoMediaStreamSource(Stream media) { this.MediaStream = media; ParseMediaStream(MediaStream); } private void ParseMediaStream(Stream MediaStream) { //read the size of the MediaInfo header information MediaStream.Seek(0L, SeekOrigin.Begin); Byte[] HdrSizeBuff = new Byte[HdrSizeByteLength]; MediaStream.Read(HdrSizeBuff, 0, HdrSizeByteLength); HdrByteLength = BitConverter.ToInt32(HdrSizeBuff, 0); Byte[] MediaInfoBuff = new Byte[HdrByteLength];

MediaStream.Seek(MediaStream.Length - HdrByteLength, SeekOrigin.Begin);

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MediaStream.Read(MediaInfoBuff, 0, HdrByteLength); byte[] TrimmedBuff = MediaInfoBuff.Reverse().SkipWhile((b) => Convert.ToInt32(b) == 0).Reverse().ToArray(); MemoryStream ms = new MemoryStream(TrimmedBuff); DataContractSerializer ser = new DataContractSerializer(typeof(MediaInfo)); mediaInfo = ser.ReadObject(ms) as MediaInfo; } protected override void CloseMedia() { MediaStream.Close(); } protected override void GetDiagnosticAsync(MediaStreamSourceDiagnosticKind diagnosticKind) { } protected override void GetSampleAsync(MediaStreamType mediaStreamType) { if (lastFrame > mediaInfo.FrameCount) { MediaStreamDescription msd = new MediaStreamDescription(MediaStreamType.Video, mediaStreamAttributes); MediaStreamSample mediaSample = new MediaStreamSample(msd, null, 0, 0, 0, mediaSampleAttributes); } else { MediaStreamDescription msd = new MediaStreamDescription(MediaStreamType.Video, mediaStreamAttributes); MediaStreamSample mediaSample = new MediaStreamSample(msd, MediaStream, (lastFrame * FrameSize) + HdrSizeByteLength, FrameSize, (long)(lastFrame * FrameDuration), mediaSampleAttributes); lastFrame++; ReportGetSampleCompleted(mediaSample); } }

protected override void OpenMediaAsync() {

lastFrame = 0; FrameSize = (long)(mediaInfo.FrameHeight * mediaInfo.FrameWidth * 4); FrameDuration = TimeSpan.FromMilliseconds(1000 / mediaInfo.FrameRate).Ticks; mediaSourceAttributes.Add(MediaSourceAttributesKeys.CanSeek, true.ToString()); mediaSourceAttributes.Add(MediaSourceAttributesKeys.Duration, ((long)(mediaInfo.FrameCount * FrameDuration)).ToString()); mediaStreamAttributes.Add(MediaStreamAttributeKeys.Height, mediaInfo.FrameHeight.ToString()); mediaStreamAttributes.Add(MediaStreamAttributeKeys.Width, mediaInfo.FrameWidth.ToString()); mediaStreamAttributes.Add(MediaStreamAttributeKeys.CodecPrivateData, ""); mediaStreamAttributes.Add(MediaStreamAttributeKeys.VideoFourCC, "RGBA"); mediaStreamDescriptions.Add(new MediaStreamDescription(MediaStreamType.Video, mediaStreamAttributes)); mediaSampleAttributes.Add(MediaSampleAttributeKeys.FrameHeight, mediaInfo.FrameHeight.ToString()); mediaSampleAttributes.Add(MediaSampleAttributeKeys.FrameWidth, mediaInfo.FrameWidth.ToString()); MediaStream.Seek(HdrSizeByteLength, SeekOrigin.Begin); ReportOpenMediaCompleted(mediaSourceAttributes, mediaStreamDescriptions); } protected override void SeekAsync(long seekToTime) { //find the corresponding frame lastFrame = (long)(mediaInfo.FrameRate * TimeSpan.FromTicks(seekToTime).TotalSeconds) + HdrSizeByteLength; this.ReportSeekCompleted(seekToTime); } protected override void SwitchMediaStreamAsync(MediaStreamDescription mediaStreamDescription) { } } }

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