该功能主要实现实时截取当前屏幕并保存为bmp格式的图片到当前程序运行的路径底下。用户只要点击对话框上的按钮，就能在相应路径底下查看图片。-The main functions to realize real-time capture the current screen and saved as a BMP format pictures under the path to the current program is running. Users just click on the butto