利用 Direction GetNextDirection()函数来实现走迷宫算法的主要思想；1）在当前位置，若右手不为墙，则原地右转返回toright(d)；2）否则返回 d；

若返回的d为墙，则主函数调用void OnError() 通知动态链接库，d向左转两次，然后再调DirectionGetNextDirection()-Using Direction GetNextDirection () function to achieve the main ideas without having to wade algorithm　1) in the current location, if not for the right hand wall, then turn right spot to return toright (d)　2) otherwise d　if returned to the wall d , the main function call void OnError () to inform the dynamic link library, d turn left twice, and then transferred DirectionGetNextDirection ()