Add/Modify EXIF info of PNG file RSS

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  gibble

  Participant

  786 Points

  226 Posts

  Add/Modify EXIF info of PNG file

  Jul 14, 2009 01:13 AM|LINK

  I'm trying to add some exif info to a png, but I can't seem to find documentation on how to accomplish this.

  Is there anything in the framework?  Or a good document online explaining how one would go about this?

  
  

  Thanks

  -c
  

  png Exif

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  gibble

  Participant

  786 Points

  226 Posts

  Re: Add/Modify EXIF info of PNG file

  Jul 14, 2009 01:54 AM|LINK

  This is what I have so far, but it doesn't seem to actually save.

  if (File.Exists(pngPath))
                      {
                          using (Stream pngStream = File.Open(pngPath, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite))
                          {
                              PngBitmapDecoder pngDecoder = new PngBitmapDecoder(pngStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.OnLoad);
                              BitmapFrame pngFrame = pngDecoder.Frames[0];
                              InPlaceBitmapMetadataWriter pngInplace = pngFrame.CreateInPlaceBitmapMetadataWriter();
                              if (pngInplace.TrySave() == true)
                              {
                                  pngInplace.SetQuery("/Text/Description", "Testing");
                              }
                              pngStream.Close();
                          }
                      }

  
  
  

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  Nai-Dong Jin...

  All-Star

  41630 Points

  3558 Posts

  Re: Add/Modify EXIF info of PNG file

  Jul 20, 2009 03:37 AM|LINK

  Hi,

  You may try the following code, change BitmapCacheOption.OnLoad to BitmapCacheOption.Default.

   

  Stream pngStream = new System.IO.FileStream("winter.png", FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite);
   
  
  PngBitmapDecoder pngDecoder = new PngBitmapDecoder(pngStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
   
  
  BitmapFrame pngFrame = pngDecoder.Frames[0];
   
  
  InPlaceBitmapMetadataWriter pngInplace = pngFrame.CreateInPlaceBitmapMetadataWriter();
   
  
  if (pngInplace.TrySave() == true)
   
  
  {
   
  
       pngInplace.SetQuery("/Text/Author", "Me");
   
  
  }
   
  
  pngStream.Close();

  Thanks.
  

  Please mark the replies as answers if they help or unmark if not.Feedback to usMicrosoft One Code Framework
  • Marked as answer by Nai-Dong Jin - MSFT on Jul 20, 2009 03:39 AM