用C简单编写通讯录源代码(经典)申请加精 通讯录的源代码（用链表实现）-prepared with a simple C source code directory (classic) for inclusion in the intensive increase in the source code (with Chain achieved)

于八方向链码的边界跟踪代码，其中数组存储的是边界点的矢量方向，存储的是边界点的坐标。-in eight directions chain code border tracking code, which is stored in an array of border points vector direction, Storage is the boundary point coordinates.