Public Sub StartOverlay( _
   ByVal callback As CodecsOverlayCallback, _
   ByVal mode As CodecsOverlayCallbackMode _
) 

Dim instance As RasterCodecs
Dim callback As CodecsOverlayCallback
Dim mode As CodecsOverlayCallbackMode
 
instance.StartOverlay(callback, mode)

public void StartOverlay( 
   CodecsOverlayCallback callback,
   CodecsOverlayCallbackMode mode
)

public:
void StartOverlay( 
   CodecsOverlayCallback^ callback,
   CodecsOverlayCallbackMode mode
) 

Private Sub PtokaOverlayExample(ByVal ptokaFileName As String, ByVal ptokaFilesPath As String)
      Dim codecs As RasterCodecs = New RasterCodecs()
      Dim destFileName As String = Path.Combine(LEAD_VARS.ImagesDir, "PtokaOverlay.tif")

      ' Set up the private variables used in the callback
      myCodecs = codecs
      myPtokaFilesPath = ptokaFilesPath

      ' Set the overlay callback
      codecs.StartOverlay(AddressOf MyOverlayCallback, CodecsOverlayCallbackMode.CallLoad)

      ' Load the PTOKA file
      Dim image As RasterImage = codecs.Load(ptokaFileName)

      ' Stop the overlay by resetting the old callback.
      codecs.StopOverlay()

      ' Save the image as TIFF
      codecs.Save(image, destFileName, RasterImageFormat.Tif, 1)
      image.Dispose()

      ' Clean up
      codecs.Dispose()
   End Sub

   Private myCodecs As RasterCodecs
   Private myPtokaFilesPath As String

   Private Sub MyOverlayCallback(ByVal data As CodecsOverlayData)
      ' Show overlay information
      Console.WriteLine("File: {0}", data.FileName)
      Console.WriteLine("Page Number: {0}", data.PageNumber)
      Console.WriteLine("Info: {0}", data.Info)

      ' Construct the overlay file name
      Dim overlayFileName As String = Path.Combine(myPtokaFilesPath, data.FileName)

      If data.Info Then
         ' Info, we only need to fill in the .InfoXXX members of the data
         Dim imageInfo As CodecsImageInfo = myCodecs.GetInformation(overlayFileName, False)
         data.InfoWidth = imageInfo.Width
         data.InfoHeight = imageInfo.Height
         data.InfoXResolution = imageInfo.XResolution
         data.InfoYResolution = imageInfo.YResolution
      Else
         ' We need to load the overlay image into the .Image member
         data.Image = myCodecs.Load(overlayFileName)
      End If
   End Sub

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

void PtokaOverlayExample(string ptokaFileName, string ptokaFilesPath)
   {
      RasterCodecs codecs = new RasterCodecs();
      string destFileName = Path.Combine(LEAD_VARS.ImagesDir, "PtokaOverlay.tif");

      // Set up the private variables used in the callback
      myCodecs = codecs;
      myPtokaFilesPath = ptokaFilesPath;

      // Set the overlay callback
      codecs.StartOverlay(MyOverlayCallback, CodecsOverlayCallbackMode.CallLoad);

      // Load the PTOKA file
      RasterImage image = codecs.Load(ptokaFileName);

      // Stop the overlay by resetting the old callback.
      codecs.StopOverlay();

      // Save the image as TIFF
      codecs.Save(image, destFileName, RasterImageFormat.Tif, 1);
      image.Dispose();

      // Clean up
      codecs.Dispose();
   }

   RasterCodecs myCodecs;
   string myPtokaFilesPath;

   void MyOverlayCallback(CodecsOverlayData data)
   {
      // Show overlay information
      Console.WriteLine("File: {0}", data.FileName);
      Console.WriteLine("Page Number: {0}", data.PageNumber);
      Console.WriteLine("Info: {0}", data.Info);

      // Construct the overlay file name
      string overlayFileName = Path.Combine(myPtokaFilesPath, data.FileName);

      if(data.Info)
      {
         // Info, we only need to fill in the .InfoXXX members of the data
         CodecsImageInfo imageInfo = myCodecs.GetInformation(overlayFileName, false);
         data.InfoWidth = imageInfo.Width;
         data.InfoHeight = imageInfo.Height;
         data.InfoXResolution = imageInfo.XResolution;
         data.InfoYResolution = imageInfo.YResolution;
      }
      else
      {
         // We need to load the overlay image into the .Image member
         data.Image = myCodecs.Load(overlayFileName);
      }
   }

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