MVVM WPF Webcam Not Working..?

Question

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i am working on a project and need to stream video through mvvm pattern.i got video in code behind.but i can't get video in mvvm pattern.

in xaml for button and image control :-

XML

<Button Command="{Binding StartCommand}"  Content="Start" Grid.Row="4" Height="38"      Margin="9" Name="btnwebcamstart"  Width="{StaticResource btnWidth}"/>

XML

<Image Source="{Binding Source=Imagevideo}"   Margin="9" Name="patientvideo" Stretch="Fill"  Width="120" Grid.RowSpan="2" Height="104" Grid.Row="1" />

i just make one image property:

C#

public Image Imagevideo
       {
           get
           {
               return imagevideo;
           }
           set
           {
               imagevideo = value;
               OnPropertyChaged("Imagevideo");
           }
       }

WebCam is a .cs file .
in constructor i write:-

C#

WebCam webcam=new webcam();
   webcam.InitializeWebCam(ref  Imagevideo);
   this.StartCommand = new DelegateCommand<object>(this.patientvideostart);
   }
   public void InitializeWebCam(ref System.Windows.Controls.Image ImageControl)
       {
           webcam = new WebCamCapture();
           webcam.FrameNumber = ((ulong)(0ul));
           webcam.TimeToCapture_milliseconds = FrameNumber;
           webcam.ImageCaptured += new WebCamCapture.WebCamEventHandler(webcam_ImageCaptured);
           _FrameImage = ImageControl;
       }
     void webcam_ImageCaptured(object source, WebcamEventArgs e)
       {
           _FrameImage.Source = LoadBitmap((System.Drawing.Bitmap)e.WebCamImage);
       }
    public static BitmapSource LoadBitmap(System.Drawing.Bitmap source)
       {

           ip = source.GetHbitmap();

           bs = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(ip, IntPtr.Zero, System.Windows.Int32Rect.Empty,

               System.Windows.Media.Imaging.BitmapSizeOptions.FromEmptyOptions());

           DeleteObject(ip);

           return bs;

       }

i just call one start method from .cs file

C#

public void patientvideostart(object parameter)
       {

           webcam.Start();
       }

C#

//webcam.InitializeWebCam(ref  Imagevideo);

in code behind "ref imagevideo" is a image control .i changed to a property"ref Imagevideo".so in here i got the error.
"A property,indexer or dynamic member access may not be passed as an out or ref parameter"

what i can do for getting the video streaming in mvvm.advance thanks..

C#

<pre lang="c#">

Posted 18-Jun-12 2:18am

nixen09

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Programm3r · Answer 1 · 2012-06-18T03:31:00

Hi,

The error is pretty clear - you can't pass a property to a ref parameter of a method.

You need to make a temporary:

C#

var circle = painting.Circles[mutationIndex];
MutatePosition(ref circle, painting.Width, painting.Height);
painting.Circles[mutationIndex] = circle;

That being said, mutable structs are often a bad idea. You might want to consider making this a class instead of a struct.

Have a look at the following CP article: Using YouTube API 1.9.0.0 with MVVM-Light-Toolkit[^] - it might shed some light on the issue.

Kind regards,