Printing silverlight control in silverlight 2.0 RSS

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  kondamca

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  Printing silverlight control in silverlight 2.0

  May 20, 2009 04:37 PM | LINK

  Hi All,

  I have silverlight control like employeedetails.xaml . In this file I have a button print. when I click the  print button the content in this control needs to be print. How can I get this in silverlight 2.0 . my application is complet silverlight light application only one aspx page is there to host silverlight application.

  Can some one please guide me how to get the print functionality in silverlight2.0 

  Thanks in advance.

  Regards,

  Konda.

   

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  EliteMike

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  Re: Printing silverlight control in silverlight 2.0

  May 20, 2009 04:50 PM | LINK

  Silverlight has no printing support.  What you can do is set up a webservice that uses wcf to create an image from the xaml.  That's the only way I know to do it right now.

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  kondamca

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  Re: Re: Printing silverlight control in silverlight 2.0

  May 21, 2009 04:36 AM | LINK

  Hi EliteMike,

  Can you explain me indetail how to do printing with web service call. Please provide me some example.

  Thanks,

  Konda.

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  EliteMike

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  Re: Re: Printing silverlight control in silverlight 2.0

  May 21, 2009 02:22 PM | LINK

  I included code below that I use in my own project, I hope  you can get an understanding from this.

  This is all done in a webservice so you need to configre one first

  I'm almost positive this is the basic template of what you need to do this, I only removed code that 

  was specifc to my project.  

  There may be a way to pass in your xaml from silverlight, but I actually just rebuild mine in wpf.  I pass in some parameters to 

  the GenerateImage sub and build based on my parameters.

  1    Public WithEvents MyImage As Canvas ' Root canvas of the image generated
  
  Private Delegate Sub CanvasDelegate(ByVal o As Canvas)
  
  Private retImageStream As System.IO.Stream ' Stream used to return the image to the client.
  
  Dim Width As Double = 10
  
  Dim Height As Double = 8
  
  Const SCREEN_DPI As Double = 96.0 ' Screen DPI
  
  Const TARGET_DPI As Double = 300.0 ' Print Quality DPI
  
  

  
  Public Sub GenerateImage()
          Dim thread As System.Threading.Thread = New System.Threading.Thread(New System.Threading.ThreadStart(AddressOf CreateImage))
          thread.SetApartmentState(System.Threading.ApartmentState.STA)
          thread.IsBackground = True
          thread.Start()  ' Start the thread
          thread.Join()   ' Joining with the thread causes execution of the remaining lines of this method to wait for the thread to complete.
  
      End Sub
  
    Public Sub CreateImage()
                  MyImage.Children.Add(YourElements)
  
  
                  '' These lines ensure that our new visual tree elements will be processed and end up on our final image.
                  MyImage.Measure(New System.Windows.Size(Width, Height))
                  MyImage.Arrange(New System.Windows.Rect(0, 0, Width, Height))
                  MyImage.UpdateLayout()
  
          MyImage.Clip = New RectangleGeometry(New Rect(0, 0, 800, 600))
  
  
          Dim cnv As New Canvas
  
          ' Invoke the delegate to render the WPF visual tree to an image.
          Dim slt As CanvasDelegate
          slt = New CanvasDelegate(AddressOf Capture)
          MyImage.Dispatcher.Invoke(System.Windows.Threading.DispatcherPriority.Background, slt, MyImage)
    End Sub
  
  
      Public Sub Capture(ByVal MyImage As Canvas)
          ' Normally we would obtain a user's configured DPI setting to account for the possibilty of a high DPI setting. 
          ' However, this code is running server side so the client's DPI is not obtainable.
          Const SCREEN_DPI As Double = 96.0   ' Screen DPI
          Const TARGET_DPI As Double = 300.0  ' Print Quality DPI
  
          ' Determine the constraining scale to maintain the aspect ratio and the bounds of the image size
          Dim scale As Double = Math.Min(Width * SCREEN_DPI / MyImage.Width, Height * SCREEN_DPI / MyImage.Height)
  
          ' Setup the bounds of the image
          Dim bounds As Rect = New Rect(0, 0, MyImage.Width * scale, MyImage.Height * scale)
          MyImage.Measure(New Size(MyImage.Width * scale, MyImage.Height * scale))
          MyImage.Arrange(bounds)
  
          Dim pixHeight As Integer = CDbl(MyImage.Height * scale / SCREEN_DPI * TARGET_DPI)
          Dim pixWidth As Integer = CDbl(MyImage.Width * scale / SCREEN_DPI * TARGET_DPI)
  
          ' Create the target bitmap
          Dim rtb As RenderTargetBitmap = New RenderTargetBitmap(pixWidth, pixHeight, TARGET_DPI, TARGET_DPI, PixelFormats.Pbgra32)
  
          ' Render the image to the target bitmap
          Dim dv As DrawingVisual = New DrawingVisual()
          Using ctx As DrawingContext = dv.RenderOpen()
              Dim vb As New VisualBrush(MyImage)
              ctx.DrawRectangle(vb, Nothing, New Rect(New System.Windows.Point(), bounds.Size))
          End Using
  
          ' Render the visual to the bitmap.
          rtb.Render(dv)
  
          'Create PNG
          Dim image As New PngBitmapEncoder
          image.Frames.Add(BitmapFrame.Create(rtb))
          Dim pathLoc As String = 'Your Path'
          Dim stm As Stream = File.Create(System.IO.Path.Combine(pathLoc, "FileName.png"))
          Clipboard.SetImage(rtb)
          Try
              image.Save(stm)
          Finally
              stm.Dispose()
          End Try
  
      End Sub