该功能主要实现bmp图片的加载和左右栅条化的显示。用户只要通过打开按钮选择bmp格式的图片就会看到图片加载到对话框的客户区里，点击菜单栏的栅条化效果后就能看到图片重新以左右栅条的形式显示出来。-The function main article about loading and gate of BMP image display. User just by opening the button to choose BMP format picture you will see the imag