一个Twain的助手类，可以用它轻松实现简单twain应用程序的编写-Twain

this resoure is ctwainhelper src, you can use this sample to develop your twain applicateon, just want to share the resource. reference：http://blog.csdn.net/yonsm/article/details/173186-this resoure is ctwainhelper src,