Overloads Public Function LoadAsync( _
   ByVal stream As Stream, _
   ByVal tile As LeadRect, _
   ByVal bitsPerPixel As Integer, _
   ByVal order As CodecsLoadByteOrder, _
   ByVal firstPage As Integer, _
   ByVal lastPage As Integer, _
   ByVal userState As Object _
) As RasterImage

Dim instance As RasterCodecs
Dim stream As Stream
Dim tile As LeadRect
Dim bitsPerPixel As Integer
Dim order As CodecsLoadByteOrder
Dim firstPage As Integer
Dim lastPage As Integer
Dim userState As Object
Dim value As RasterImage
 
value = instance.LoadAsync(stream, tile, bitsPerPixel, order, firstPage, lastPage, userState)

public RasterImage LoadAsync( 
   Stream stream,
   LeadRect tile,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage,
   object userState
)

public:
RasterImage^ LoadAsync( 
   Stream^ stream,
   LeadRect tile,
   int bitsPerPixel,
   CodecsLoadByteOrder order,
   int firstPage,
   int lastPage,
   Object^ userState
) 

Public Sub LoadAsyncStream4Example()
      Dim codecs As New RasterCodecs()

      Dim srcFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp")

      ' Load a random tile from the image at 1 bits/pixel asynchronously
      Dim tileRect As New LeadRect(100, 50, 200, 150)
      AddHandler codecs.LoadAsyncCompleted, AddressOf LoadAsyncStream4Example_LoadAsyncCompleted
      Dim stream As Stream = File.OpenRead(srcFileName)
      Dim rasterImageObject As Object = codecs.LoadAsync(stream, tileRect, 1, CodecsLoadByteOrder.Rgb, 1, 1, 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 LoadAsyncStream4Example_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 loaded OK, size: {0} by {1}, order: {2}, bits/pixel: {3}", image.Width, image.Height, image.Order, image.BitsPerPixel)
         image.Dispose()
      End If

      ' We should close the stream here
      e.Stream.Dispose()

      ' Unsubscribe to the event and dispose the RasterCodecs object
      Dim codecs As RasterCodecs = DirectCast(sender, RasterCodecs)
      RemoveHandler codecs.LoadAsyncCompleted, AddressOf LoadAsyncStream4Example_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 LoadAsyncStream4Example()
   {
      RasterCodecs codecs = new RasterCodecs();

      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");

      // Load a random tile from the image at 1 bits/pixel asynchronously
      LeadRect tileRect = new LeadRect(100, 50, 200, 150);
      codecs.LoadAsyncCompleted += new EventHandler<CodecsLoadAsyncCompletedEventArgs>(LoadAsyncStream4Example_LoadAsyncCompleted);
      Stream stream = File.OpenRead(srcFileName);
      object rasterImageObject = codecs.LoadAsync(stream, tileRect, 1, CodecsLoadByteOrder.Rgb, 1, 1, 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 LoadAsyncStream4Example_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 loaded OK, size: {0} by {1}, order: {2}, bits/pixel: {3}", image.Width, image.Height, image.Order, image.BitsPerPixel);
         image.Dispose();
      }

      // We should close the stream here
      e.Stream.Dispose();

      // Unsubscribe to the event and dispose the RasterCodecs object
      RasterCodecs codecs = sender as RasterCodecs;
      codecs.LoadAsyncCompleted -= new EventHandler<CodecsLoadAsyncCompletedEventArgs>(LoadAsyncStream4Example_LoadAsyncCompleted);
      codecs.Dispose();
   }

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