VC++百分比放大缩小图片源码实例，把原图片放大，也可缩小图片，原图已经载入，你只需点击窗口上的放大和缩小按钮即可-The percentage of VC++ zoom source code examples, the original image to enlarge, can also reduce image, the image is loaded, you only need to click on the zoom in and zoom out button