lancs

Currently, most of people use MS DCOM/COM+, Java Bean/RMI, and Corba to do distributed computing over internet. All of these technologies are provided with some tools and intermediate objects to simplify internet development. However, these technologies have one common and fundamental problem that all of the calls between a client and a server are blocked for a returned result (please correct me if this is wrong). A client stays still, and has to wait for a while after sending a request to a server. If the request is a lengthy action, the client application seems to be dead to a user. In most cases, we could use a worker thread at the client side to do background computation for solving this problem. However, this comes with an expensive price, more coding, data synchronization and mess in coding logic. Additionally, I also doubt that these technologies are able to really move data across internet efficiently.

程序记录并显示了数据报从源端机器传送到目标机器的过程中所经过的路由器的IP地址，并且记录了数据报到达每个路由器所需要的时间。认真观察到达每个路由器的时间有什么区别，从而熟练掌握traceroute的工作原理和ICMP报文协议。　(The program records and displays the IP addresses of routers through which the datagram sent from the source client machine to the target machine , and the recording of the data packets arrive at the time required by each router . )

Big 2 Online (server and client)

TCP端口扫描，可以获得指定IP段内的主机名，mac地址，存活端口，并将这些信息保存在SQLITE数据库，下次可以直接读取数据库信息，移值性好！(CP port scan, you can get within the segment specified IP host name, mac address, survival ports, and the information stored in the SQLITE database, the next can be read directly, transfer value is good!)

实现简单的window局域网通信，即，传输文件。飞秋(Simple window LAN communications, that is, transmission file. Fei Qiu)

用Visual C++编写的UDP客户端程序。(Using Visual C++ Prepared UDP client program.)

说明：  基于 异步选择模型的聊天程序，简单实现服务器和客户端的对话(Select model based on asynchronous chat program, simple implementation of server and client dialogue)

实现本地程序从远程服务器下载文件。保存到本地。同时，具备断点续传的功能。可以在下载一部分的情况下，再次下载从断点处继续下载。(Implement a local program to download files a remote server. Saved locally. At the same time, with the functions of HTTP. You can download a part in the case, once again download continue downloading the breakpoint.)

一个基于 Labview 的 UDP 通信实例。用户可通过该实例对 TCP-UDP 协议的工作方式有基本的了解。(Labview an instance of communication based on UDP. Users can work through the example of TCP-UDP protocol is a basic understanding.)

VC UDP通讯，后台服务器 FileMana.cpp FileMana.h Login.cpp Login.h resource.h SocketUdp.cpp SocketUdp.h StdAfx.cpp StdAfx.h WinSockUDP.aps WinSockUDP.clw WinSockUDP.cpp WinSockUDP.dsp WinSockUDP.dsw WinSockUDP.h WinSockUDP.ncb WinSockUDP.opt WinSockUDP.plg WinSockUDP.rc WinSockUDP.sln WinSockUDP.vcproj WinSockUDP.vcproj.T400-CKX.Administrator.user WinSockUDPDlg.cpp WinSockUDPDlg.h( FileMana.cpp FileMana.h Login.cpp Login.h resource.h SocketUdp.cpp SocketUdp.h StdAfx.cpp StdAfx.h WinSockUDP.aps WinSockUDP.clw WinSockUDP.cpp WinSockUDP.dsp WinSockUDP.dsw WinSockUDP.h WinSockUDP.ncb WinSockUDP.opt WinSockUDP.plg WinSockUDP.rc WinSockUDP.sln WinSockUDP.vcproj WinSockUDP.vcproj.T400-CKX.Administrator.user WinSockUDPDlg.cpp WinSockUDPDlg.h)