Overloads Public Function GetInformationAsync( _
   ByVal stream As Stream, _
   ByVal totalPages As Boolean, _
   ByVal pageNumber As Integer, _
   ByVal userState As Object _
) As CodecsImageInfo

Dim instance As RasterCodecs
Dim stream As Stream
Dim totalPages As Boolean
Dim pageNumber As Integer
Dim userState As Object
Dim value As CodecsImageInfo
 
value = instance.GetInformationAsync(stream, totalPages, pageNumber, userState)

public CodecsImageInfo GetInformationAsync( 
   Stream stream,
   bool totalPages,
   int pageNumber,
   object userState
)

public:
CodecsImageInfo^ GetInformationAsync( 
   Stream^ stream,
   bool totalPages,
   int pageNumber,
   Object^ userState
) 

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

      Dim codecs As New RasterCodecs()

      ' Now get information about the file asynchronously
      AddHandler codecs.GetInformationAsyncCompleted, AddressOf GetInformationAsyncStreamExample_GetInformationAsyncCompleted

      Dim stream As Stream = File.OpenRead(srcFileName)
      Dim imageInfoObject As Object = codecs.GetInformationAsync(stream, True, 1, Nothing)

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

   Private Sub GetInformationAsyncStreamExample_GetInformationAsyncCompleted(ByVal sender As Object, ByVal e As CodecsGetInformationAsyncCompletedEventArgs)
      If e.Cancelled Then
         Console.WriteLine("User canceled")
      ElseIf Not IsNothing(e.Error) Then
         Console.WriteLine("Error: " + e.Error.Message)
      Else
         ' Get the image info
         Dim info As CodecsImageInfo = DirectCast(e.Info, CodecsImageInfo)
         Console.WriteLine("Image info obtainted asynchronously:\n{0}", info.ToString())
         info.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.GetInformationAsyncCompleted, AddressOf GetInformationAsyncStreamExample_GetInformationAsyncCompleted
      codecs.Dispose()
   End Sub

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

public void GetInformationAsyncStreamExample()
   {
      string srcFileName = Path.Combine(LEAD_VARS.ImagesDir, "Image1.cmp");

      RasterCodecs codecs = new RasterCodecs();

      // Now get information about the file asynchronously
      codecs.GetInformationAsyncCompleted += new EventHandler<CodecsGetInformationAsyncCompletedEventArgs>(GetInformationAsyncStreamExample_GetInformationAsyncCompleted);

      Stream stream = File.OpenRead(srcFileName);
      object imageInfoObject = codecs.GetInformationAsync(stream, true, 1, null);

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

   private void GetInformationAsyncStreamExample_GetInformationAsyncCompleted(object sender, CodecsGetInformationAsyncCompletedEventArgs e)
   {
      if(e.Cancelled)
      {
         Console.WriteLine("User canceled");
      }
      else if(e.Error != null)
      {
         Console.WriteLine("Error: " + e.Error.Message);
      }
      else
      {
         // Get the image info
         CodecsImageInfo info = e.Info;
         Console.WriteLine("Image info obtainted asynchronously:\n{0}", info.ToString());
         info.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.GetInformationAsyncCompleted -= new EventHandler<CodecsGetInformationAsyncCompletedEventArgs>(GetInformationAsyncStreamExample_GetInformationAsyncCompleted);
      codecs.Dispose();
   }

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