说明：  利用GDI+播放GIF动画的原代码。GDI+虽然虽然支持GIF文件格式，但是不能通过某个函数完成GIF动画的播放。播放GIF整个过程不同于图像处理，过程较为复杂。
(The use of GDI+ to play GIF animation original code. While supporting the GDI+ Although the GIF file format, but can not achieve a certain function of GIF animation player. Different players throughout the process GIF image processing, process more complex.)