Public Class RasterImageTypeConverter 
   Inherits System.ComponentModel.TypeConverter

Dim instance As RasterImageTypeConverter

public class RasterImageTypeConverter : System.ComponentModel.TypeConverter 

public ref class RasterImageTypeConverter : public System.ComponentModel.TypeConverter 

Public Sub RasterImageTypeConverterExample()
      Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif")

      ' Construct the source URL to use the source file and load the image
      Dim uri As New Uri(srcFileName)

      Dim codecs As New RasterCodecs()

      ' Create a new instance of the RasterImageTypeConverter class
      Dim rasterImageConverter As New RasterImageTypeConverter(codecs)

      ' We should be able to convert from a URL
      Debug.Assert(rasterImageConverter.CanConvertFrom(uri.GetType()))

      ' Convert the image

      ' The return value from RasterImageTypeConverter.ConvertFrom might be an image that is
      ' still loading. So, we must subscribe to the RasterCodecs.LoadAsyncCompleteted
      ' event to obtain the finished image
      AddHandler codecs.LoadAsyncCompleted, AddressOf rasterImageTypeConverterExample_LoadAsyncCompleted
      Dim rasterImageObject As Object = rasterImageConverter.ConvertFrom(uri)

      ' Notice that the returned rasterImageObject is a RasterImage with IsLoading set to true at this point
      ' The IsLoading will be false (and hence, the object will be usable) when the LoadAsyncCompleteted
      ' fires.
   End Sub

   Private Sub rasterImageTypeConverterExample_LoadAsyncCompleted(ByVal sender As Object, ByVal e As CodecsLoadAsyncCompletedEventArgs)
      ' Check if the user canceled or if we have errors
      If e.Cancelled Then
         Console.WriteLine("Canceled by the user")
      ElseIf Not IsNothing(e.Error) Then
         Console.WriteLine("Error: " + e.Error.Message)
      Else
         ' Everything is OK, get the image
         Dim image As RasterImage = e.Image

         Console.WriteLine("Image at {0} loaded OK, size: {1} by {2}", e.Uri, image.Width, image.Height)

         image.Dispose()
      End If

      ' Unsubscribe to the event and dispose the RasterCodecs object
      Dim codecs As RasterCodecs = DirectCast(sender, RasterCodecs)
      RemoveHandler codecs.LoadAsyncCompleted, AddressOf rasterImageTypeConverterExample_LoadAsyncCompleted
      codecs.Dispose()
   End Sub

Public NotInheritable Class LEAD_VARS
   Public Const ImagesDir As String = "C:\Users\Public\Documents\LEADTOOLS Images"
End Class

public void RasterImageTypeConverterExample()
   {
      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Ocr1.tif");

      // Construct the source URL to use the source file and load the image
      Uri uri = new Uri(srcFileName);

      RasterCodecs codecs = new RasterCodecs();

      // Create a new instance of the RasterImageTypeConverter class
      RasterImageTypeConverter rasterImageConverter = new RasterImageTypeConverter(codecs);

      // We should be able to convert from a URL
      Debug.Assert(rasterImageConverter.CanConvertFrom(uri.GetType()));

      // Convert the image

      // The return value from RasterImageTypeConverter.ConvertFrom might be an image that is
      // still loading. So, we must subscribe to the RasterCodecs.LoadAsyncCompleteted
      // event to obtain the finished image
      codecs.LoadAsyncCompleted += new EventHandler<CodecsLoadAsyncCompletedEventArgs>(rasterImageTypeConverterExample_LoadAsyncCompleted);
      object rasterImageObject = rasterImageConverter.ConvertFrom(uri);

      // Notice that the returned rasterImageObject is a RasterImage with IsLoading set to true at this point
      // The IsLoading will be false (and hence, the object will be usable) when the LoadAsyncCompleteted
      // fires.
   }

   private void rasterImageTypeConverterExample_LoadAsyncCompleted(object sender, CodecsLoadAsyncCompletedEventArgs e)
   {
      // Check if the user canceled or if we have errors
      if(e.Cancelled)
      {
         Console.WriteLine("Canceled by the user");
      }
      else if(e.Error != null)
      {
         Console.WriteLine("Error: " + e.Error.Message);
      }
      else
      {
         // Everything is OK, get the image
         RasterImage image = e.Image;

         Console.WriteLine("Image at {0} loaded OK, size: {1} by {2}", e.Uri, image.Width, image.Height);

         image.Dispose();
      }

      // Unsubscribe to the event and dispose the RasterCodecs object
      RasterCodecs codecs = sender as RasterCodecs;
      codecs.LoadAsyncCompleted -= new EventHandler<CodecsLoadAsyncCompletedEventArgs>(rasterImageTypeConverterExample_LoadAsyncCompleted);
      codecs.Dispose();
   }

static class LEAD_VARS
{
   public const string ImagesDir = @"C:\Users\Public\Documents\LEADTOOLS Images";
}