该例程主要是一个DEMO,通过回调的形式将dll中图片的内存传到界面。 参考价值：dll的编写，回调的使用，图片文件的读写与保存。2012-9-25-The routine is mainly a DEMO, passed to the callback in the form of pictures in the dll memory interface. Reference value: dll written callback use image files to read and