一个展示聚光灯效果的Windows程序代码，生成程序后用方向键操作。需要用到DirectX 9。注意项目属性中的字符集要改成Multi-byte Set，而且要设置与DX 9相关的头文件和.lib文件的连接。-A showcase spotlight effect Windows code, use the arrow keys to generate the program after the operation. Need to use DirectX 9. Note that the character set project properties to change Multi-byte Set, and the connection to be set up with DX 9 related header files and. Lib files.