winforms qr code reader

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that are completely relevant to the job for which they are interviewing. Finally, avoid brain teaser questions like the one where you have to arrange six equal-length sticks to make exactly four identical perfect triangles. Or anything involving pirates, marbles, and secret codes. Most of these are Aha! questions the kind of question where you either know the answer or you don t. With these questions, knowing the answer just means you heard that brain teaser before. So as an interviewer, you don t get any information about smart/get things done by figuring out if they happen to make a particular mental leap. In the past, I ve used impossible questions, also known as back of the envelope questions. A classic example of this is How many piano tuners are there in Seattle The candidate won t know the answer, but smart candidates won t give up, and they ll be happy to try and estimate a reasonable number for you. Let s see, there are probably ... what, a million people in Seattle And maybe 1% of them have pianos And a piano needs to be tuned every couple of years And it takes thirty-five minutes to tune one All wrong, of course, but at least they re attacking the problem. The only reason to ask a question like this is that it lets you have a conversation with the candidate. OK, thirty-five

To reference a cross-page component, you have to go through the desktop. For example, to reference labelD of page1 from labelI of page2, you could call this method:

private void btnPlay_Click(object sender, RoutedEventArgs e) { if (me.CurrentState == MediaElementState.Paused) me.Play(); else { OpenFileDialog ofd = new OpenFileDialog() { Multiselect = false }; if (ofd.ShowDialog() == true) { FileStream filestream = ofd.File.OpenRead();

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BitmapToVideoMediaStreamSource mss = new BitmapToVideoMediaStreamSource(filestream); me.SetSource(mss); } } } private void sliderSeek_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e) { if (me.CurrentState == MediaElementState.Paused) { me.Position = TimeSpan.FromTicks((long)e.NewValue * me.NaturalDuration.TimeSpan.Ticks / 100); } } private void btnPause_Click(object sender, RoutedEventArgs e) { me.Pause(); } } } The code in Listing 10-32 is very similar to players built in earlier samples in this chapter. The only difference is the way you initialize the MediaElement. In the Click handler method named btnPlay_Click() for the Button btnPlay, you use the OpenFileDialog type to ask the user the name of a disk-based file to be played. Keep in mind that this must be a file that has been recorded using the Recorder component discussed previously. After the file is opened, you create a new instance of the BitmapToVideoMediaStreamSource type, passing in the stream. Then, you invoke SetSource() on the MediaElement, passing in the custom MediaStreamSource instance. Figure 10-27 shows the player playing a recording using the custom MediaStreamSource.

You can use the VideoCaptureDevice and AudioCaptureDevice types in Silverlight 4 to connect your application to an existing webcam and microphone on your computer and use the VideoBrush to display the captured video.

Silverlight 4 adds support for integrating a webcam connected to your machine into your application. Silverlight represents a connected webcam using an instance of the System.Windows.Media.VideoCaptureDevice type. It similarly represents a connected microphone using the AudioCaptureDevice type in the same namespace. Each of these types inherits the base class CaptureDevice meant to represent a generic capture device on your system. To get a list of the available video and audio capture devices on your system, you can use the CaptureDeviceConfiguration class. The CaptureDeviceConfiguration.GetDefaultVideoDevice() and GetDefaultAudioDevice() static methods return the default video and audio capture devices as designated in your system, while the GetAvailableVideoCaptureDevices() and GetAvailableAudioCaptureDevices() static methods return collections of all the video and audio capture devices on the system. Both the VideoCaptureDevice and the AudioCaptureDevice expose two properties named FriendlyName and IsDefaultDevice respectively the former providing a string name for the device and the later returning a boolean value indicating if the device is the default device on the system.

labelI.getDesktop().getPage("page1").getFellow("winA").getFellow("labelD")

Each capture device on the system may support more than one format of capture where formats may differ in properties like resolution, frame rate, sampling rate etc. The VideoFormat type exposes several properties that provide information about a specific supported video format. The list below explains the properties: FramesPerSecond Frame rate at which the device captures video PixelFormat A value of the PixelFormatType enumeration indicating the pixel structure. Current allowable values are PixelFormatType.Unknown indicating an unknown pixel structure and PixelFormatType.Format32bppArgb indicating a 32-bit-sized pixel, with each of the 8 bits storing the alpha, red, green and blue color channel values for the pixel. PixelHeight Height of a frame in pixels PixelWidth Width of a frame in pixels Stride The bitmap stride of the frame bitmap

The VideoCaptureDevice.DesiredFormat property exposes the default VideoFormat for the device, while the VideoCaptureDevice.SupportedFormats collection reports all the video formats supported by the device.

In the same vein, the AudioFormat type represents an audio format and exposes the following properties: BitsPerSample The size of a single audio sample in bits Channels The number of channels in the captured audio SamplesPerSecond The sampling rate WaveFormat A value from the WaveFormatType enumeration type. The currently supported value is limited to WaveFormatType.Pcm for PCM audio.

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