Examine animated Gif’s in C#

public struct ImageInfo

{

  public int Width;

  public int Height;

  public bool IsAnimated;

  public bool IsLooped;

  public int AnimationLength; // In milliseconds

}>

And this is the method that returns the struct when given a file name:

using System.Drawing.Imaging;>

public static ImageInfo GetImageInfo(string path)

{

  ImageInfo info = new ImageInfo();

  using (System.Drawing.Image image = System.Drawing.Image.FromFile(path))

  {     

    info.Height = image.Height;

    info.Width = image.Width;

    if (image.RawFormat.Equals(ImageFormat.Gif))

    {

      if (System.Drawing.ImageAnimator.CanAnimate(image))

      {

        FrameDimension frameDimension = new FrameDimension(image.FrameDimensionsList[0]);

        int frameCount = image.GetFrameCount(frameDimension);

        int delay = 0;         

        int this_delay = 0;

        int index = 0;

        for (int f = 0; f < frameCount; f++)

        {

          this_delay = BitConverter.ToInt32(image.GetPropertyItem(20736).Value, index) * 10;

          delay += (this_delay < 100 ? 100 : this_delay);  // Minimum delay is 100 ms

          index += 4;

        }

        info.AnimationLength = delay;

        info.IsAnimated = true;

        info.IsLooped = BitConverter.ToInt16(image.GetPropertyItem(20737).Value, 0) != 1;

      }

    }

  }

  return info;
}

Example of use

Here is an example of a web page that writes the Gif info out in the response stream:

ImageInfo info = GetImageInfo(@"c:\artists.gif");

System.Text.StringBuilder sb = new System.Text.StringBuilder();

sb.AppendLine("animation length: " + info.AnimationLength);

sb.AppendLine("height: " + info.Height);

sb.AppendLine("width: " + info.Width);

sb.AppendLine("is animated: " + info.IsAnimated);

sb.AppendLine("is looped: " + info.IsLooped);

Response.Write(sb.ToString().Replace(Environment.NewLine, "<br />"));

This is the outcome of those lines of code on a web page:

animation length: 4340
height: 81
width: 63
is animated: True
is looped: True