Public Event LoadAsyncCompleted As EventHandler(Of CodecsLoadAsyncCompletedEventArgs)

Dim instance As RasterCodecs
Dim handler As EventHandler(Of CodecsLoadAsyncCompletedEventArgs)
 
AddHandler instance.LoadAsyncCompleted, handler

public event EventHandler<CodecsLoadAsyncCompletedEventArgs> LoadAsyncCompleted

public:
event EventHandler<CodecsLoadAsyncCompletedEventArgs^>^ LoadAsyncCompleted

Public Sub LoadAsyncCompletedExample()
      Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")
      Dim uri As New Uri(srcFileName)

      Dim codecs As New RasterCodecs()

      ' Now load the image asynchronously
      AddHandler codecs.LoadAsyncCompleted, AddressOf LoadAsyncCompletedExample_LoadAsyncCompleted
      Dim rasterImageObject As Object = codecs.LoadAsync(uri, Nothing)

      ' 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 LoadAsyncCompletedExample_LoadAsyncCompleted(ByVal sender As Object, ByVal e As CodecsLoadAsyncCompletedEventArgs)
      If e.Cancelled Then
         Console.WriteLine("User canceled")
      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 LoadAsyncCompletedExample_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 LoadAsyncCompletedExample()
   {
      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");
      Uri uri = new Uri(srcFileName);

      RasterCodecs codecs = new RasterCodecs();

      // Now load the image asynchronously
      codecs.LoadAsyncCompleted += new EventHandler<CodecsLoadAsyncCompletedEventArgs>(LoadAsyncCompletedExample_LoadAsyncCompleted);
      object rasterImageObject = codecs.LoadAsync(uri, null);

      // 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 LoadAsyncCompletedExample_LoadAsyncCompleted(object sender, CodecsLoadAsyncCompletedEventArgs e)
   {
      if(e.Cancelled)
      {
         Console.WriteLine("User canceled");
      }
      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>(LoadAsyncCompletedExample_LoadAsyncCompleted);
      codecs.Dispose();
   }

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