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WriteMarker(String,Int32,RasterMarkerMetadata) Method
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Leadtools.Codecs Namespace > RasterCodecs Class > WriteMarker Method : WriteMarker(String,Int32,RasterMarkerMetadata) Method




fileName
A String that contains the file name.
pageNumber
1-based index of the page at which to write the marker.
marker
A RasterMarkerMetadata object that contains the marker data.
Writes a marker to an existing file.

Syntax

Visual Basic (Declaration) 
Overloads Public Sub WriteMarker( _
   ByVal fileName As String, _
   ByVal pageNumber As Integer, _
   ByVal marker As RasterMarkerMetadata _
)
Visual Basic (Usage)Copy Code
Dim instance As RasterCodecs
Dim fileName As String
Dim pageNumber As Integer
Dim marker As RasterMarkerMetadata
 
instance.WriteMarker(fileName, pageNumber, marker)
C# 
public void WriteMarker( 
   string fileName,
   int pageNumber,
   RasterMarkerMetadata marker
)
Managed Extensions for C++ 
public: void WriteMarker( 
   string* fileName,
   int pageNumber,
   RasterMarkerMetadata marker
)
C++/CLI 
public:
void WriteMarker( 
   String^ fileName,
   int pageNumber,
   RasterMarkerMetadata marker
)

Parameters

fileName
A String that contains the file name.
pageNumber
1-based index of the page at which to write the marker.
marker
A RasterMarkerMetadata object that contains the marker data.

Example

Visual BasicCopy Code
RasterCodecs.Markers
      Private Sub MarkersExample(ByVal srcFileName As String, ByVal destFileName As String)
         RasterCodecs.Startup()
         Dim codecs As RasterCodecs = New RasterCodecs()
         ' Load the source image with markers
         Console.WriteLine("Loading the source image with all markers")
         codecs.Options.Load.Markers = True
         Dim srcImage As RasterImage = codecs.Load(srcFileName)

         ' Show the markers loaded
         Console.WriteLine("These markers were loaded:")
         For Each marker As RasterMarkerMetadata In srcImage.Markers
            Dim data As Byte() = marker.GetData()
            Console.WriteLine(" {0}, DataSize:{1}", marker.Id, data.Length)
         Next marker

         ' Create the destination image
         Dim destImage As RasterImage = New RasterImage(RasterMemoryFlags.Conventional, 320, 20, 24, RasterByteOrder.Bgr, RasterViewPerspective.TopLeft, Nothing, IntPtr.Zero, 0)

         ' Save this as JPEG
         codecs.Save(destImage, destFileName, RasterImageFormat.Jpeg, 24)

         ' Write the markers from the source image to this destination image
         Console.WriteLine("Writing the markers to the destination file")
         codecs.WriteMarkers(destFileName, 1, srcImage.Markers)

         srcImage.Dispose()
         destImage.Dispose()

         ' Re-load the destination image with markers
         Console.WriteLine("Loading the destination image with all markers")
         codecs.Options.Load.Markers = True
         destImage = codecs.Load(destFileName)

         ' Show the markers loaded
         Console.WriteLine("These markers were loaded:")
         For Each marker As RasterMarkerMetadata In destImage.Markers
            Dim data As Byte() = marker.GetData()
            Console.WriteLine(" {0}, DataSize:{1}", marker.Id, data.Length)
         Next marker

         destImage.Dispose()

         ' Clean up
         codecs.Dispose()
         RasterCodecs.Shutdown()
      End Sub
C#Copy Code
RasterCodecs.Markers 
      void MarkersExample(string srcFileName, string destFileName) 
      { 
         RasterCodecs.Startup(); 
         RasterCodecs codecs = new RasterCodecs(); 
         // Load the source image with markers 
         Console.WriteLine("Loading the source image with all markers"); 
         codecs.Options.Load.Markers = true; 
         RasterImage srcImage = codecs.Load(srcFileName); 
 
         // Show the markers loaded 
         Console.WriteLine("These markers were loaded:"); 
         foreach(RasterMarkerMetadata marker in srcImage.Markers) 
         { 
            byte[] data = marker.GetData(); 
            Console.WriteLine(" {0}, DataSize:{1}", marker.Id, data.Length); 
         } 
 
         // Create the destination image 
         RasterImage destImage = new RasterImage( 
            RasterMemoryFlags.Conventional, 
            320, 
            20, 
            24, 
            RasterByteOrder.Bgr, 
            RasterViewPerspective.TopLeft, 
            null, 
            IntPtr.Zero, 
            0); 
 
         // Save this as JPEG 
         codecs.Save(destImage, destFileName, RasterImageFormat.Jpeg, 24); 
 
         // Write the markers from the source image to this destination image 
         Console.WriteLine("Writing the markers to the destination file"); 
         codecs.WriteMarkers(destFileName, 1, srcImage.Markers); 
 
         srcImage.Dispose(); 
         destImage.Dispose(); 
 
         // Re-load the destination image with markers 
         Console.WriteLine("Loading the destination image with all markers"); 
         codecs.Options.Load.Markers = true; 
         destImage = codecs.Load(destFileName); 
 
         // Show the markers loaded 
         Console.WriteLine("These markers were loaded:"); 
         foreach(RasterMarkerMetadata marker in destImage.Markers) 
         { 
            byte[] data = marker.GetData(); 
            Console.WriteLine(" {0}, DataSize:{1}", marker.Id, data.Length); 
         } 
 
         destImage.Dispose(); 
 
         // Clean up 
         codecs.Dispose(); 
         RasterCodecs.Shutdown(); 
      }

Remarks

For Exif files, this metadata collection will contain all the Exif and GPS comments, stored in APP1. It will also contain the audio information stored in APP2.

When you add or remove tags, the tags array at the end of the file is re-written. When you modify existing tags, the new tag value is added to the file and the IFD is modified as necessary. In all of these cases, there is no image recompression.

Requirements

Target Platforms: Microsoft .NET Framework 2.0, Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

See Also