该程序实现了将图片读入内存DC，但不读入窗口DC，并可根据坐标在图片相应位置写字的功能；点鼠标右键弹出对话框设置坐标，点确定保存图片！-The program will realize the picture is read into memory DC, but do not read into the window DC, and in accordance with the location coordinates in the picture and write the correspo