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此种模型绘制类似米字形的网格。由于整个过程递归调用绘图函数，所以可以根据误差判断绘制DEM的精细程度，从而绘制出不同精细程度的DEM，为解决漫游中数据量较大而引起的画面不流畅现象提供了模型基础。 本文并没有对LOD作研究，只是给出了四叉树的建立和遍历绘图的方法。 #include "Pt3d.h" //空间点类(主要记录空间点的x,y,z) (Rendering such a model similar to rice-shaped grid. Recursive calls as a result of the whole process of mapping function, so it can be judged according to the error map of the fine DEM, thus rendering a different degree of precision DEM, for the settlement of roaming in the amount of data arising from the larger screen does not provide a model of fluid based on the phenomenon. This article does not LOD for research, but given quadtree traversal of the establishment and mapping method.# Include Pt3d.h // space-point type (mainly recorded space points x, y, z))

Answers a Policy object with the specified type and the specified parameter.

通过计算机将数据发送到远端的大屏幕上，例如火车站售票信息(Through computer data sent to the remote big screen, such as railway station ticket information)

用VC写的winsock聊天程序，分服务器和客户机俩个程序，是学习winsock很好的源码！- Winsock writes which with VC chats the procedure, divides the server and a client pairs procedure, studies the winsock very good source code!

比较好的电子商务开发系统，可供大家学习-better e-commerce development system, we can learn

利用vc实现的局域网文件传输，共分为客户端和服务器端两部分，该部分是文件传输的服务器端，采用了TCP/UDP协议，可扩展到net网络传输！-use vc achieve LAN file transfer, is divided into client and server-side two, The file transfer is part of the server using the TCP/UDP protocol, which can be expanded to net network transmission!

通过Winsock API实现TCP聊天的程序，程序中集成了服务器端和客户端- Realized the procedure through Winsock API which TCP chatted, in the procedure integrated the server end and the customer end

检测网卡MAC地址的程序，本人测试通过。-NIC MAC address detection procedure, I test.

聊天程序,分客户端和服务端-Chat program, sub-client and server

用C语言实现安全性检测(C language safety testing)