Network Programming Project Report

throw Report 1155028688 Wang Cong Overview This project is a practice of Windows socket programming. In this program we inquire to complete the following things 1. Establish a TCP connection to the server. 2. piss a TCP socket listening on a port for the golem program. 3. Create a UDP socket for receiving packets 4. Send and set about messages via TCP sockets 5. Send and meet messages via UDP sockets 6. Compare the throughputs in different pilot burner storage sizes. This program is programmed by C++. Program Design I defined the following serves to complete the tasks demoralise OnError () This function is used to print an error message and call WSACleanup(). It is intentional to simplify the clean-up steps when error occurred. * SOCKADDR_IN *CreateSocket (SOCKET &s, u_short port, int type = IPPROTO_TCP, bool isServer = false) This function will pass water a socket for TCP/UDP connection Parameters s-Reference to the socket port-The port on which to create the connection t ype-The connection type(TCP/UDP) isServer-Set it true to establish a TCP server socket and make it to listen from the port, and false to establish a TCP client socket. generate return the SOCKADDR_IN pointer pointed to a SOCKADDR_IN object. NULL if whatever error occurred, and then the OnError() function will be called * Int sendTCP (SOCKET &s, const char *m) This function will send out a TCP message everyplace the stream socket Parameters s-Reference to the socket m-The message to be sent Return SOCKET_ERROR if any(prenominal) error occurred. , else return bytes sent. * Int recvTCP (SOCKET &s, char *buffer, int len) This function will receive a TCP message from a stream socket Parameters s-Reference to the socket uffer-The buffer to receive a message len-The buffer length Return SOCKET_ERROR if any error occurred or the buffer is a NULL pointer, else return bytes genuine These functions are designed in order to make the program to a greater extent clearly. More detail is writte n in the program. Bonus Part exam The Relationship Between Throughput And Buffer Size enrol 1 interrogation On Localhost Figure 2 Testing On 100M LAN Figure 3 Testing On 802. 11b Wireless Network We can call for the following conclusions from the figures above 1.When exam on localhost, the throughput will increase when buffer size increases, and after a particular buffer size, the throughput will subside 2. When testing on 100M LAN, the throughput will increase and approach the maximum speed(100Mbps) 3. When testing on Wireless Network, the throughput is relatively stable. Because the speed of wireless network is relatively slow. But the throughput is not reaching the highest speed, I think it is because of a higher(prenominal) delay than it was in LAN and localhost environment.