Determine if .gif is animated from c++ api

[magick]

Use STL. The image list begin() / end() tells you the length of the animation. If its 1 its not an animation:

• #include <list>
  ...
  list<Image> imageList;
  readImages( &imageList, "test_image_anim.gif" );
  ...
  cout << imageList.begin() << endl;
  cout << imageList.end() << endl;