tcp udp 网络编程源码 //创建套接字

　　sHost = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP) 　　

　　if(INVALID_SOCKET == sHost)

　　{

　　　　printf("socket failed!\n")

　　　　WSACleanup() //释放套接字资源

　　　　return -1

　　}



　　//设置服务器地址

　　servAddr.sin_family =AF_INET

　　servAddr.sin_addr.s_addr = inet_addr("127.0.0.1")

　　servAddr.sin_port = htons((short)4999)

　　int　　nServAddlen = sizeof(servAddr)



　　//连接服务器

　　retVal=connect(sHost,(LPSOCKADDR)&servAddr, sizeof(servAddr)) 　　

　　if(SOCKET_ERROR == retVal)

　　{

　　　　printf("connect failed!\n") 　　

　　　　closesocket(sHost) 　　//关闭套接字

　　　　WSACleanup() 　　　　//释放套接字资源

　　　　return -1

　　}

　　

　　//向服务器发送数据

　　ZeroMemory(buf, BUF_SZIE)

　　strcpy(buf, "MyTCP")

　　retVal = send(sHost, buf, strlen(buf), 0)

　　if (SOCKET_ERROR == retVal)

　　{

　　　　printf("send failed!\n")

　　　　closesocket(sHost) 　　//关闭套接字

　　　　WSACleanup() 　　　　//释放套接字资源

　　　　return -1 -tcp udp network programming source code// create a socket sHost = socket (AF_INET, SOCK_STREAM, IPPROTO_TCP)　if (INVALID_SOCKET == sHost) (printf ( " socket failed! \ n" )　WSACleanup () // release socket Word of resources return-1 )// set the server address servAddr.sin_family = AF_INET　servAddr.sin_addr.s_addr = inet_addr ( " 127.0.0.1" )　servAddr.sin_port = htons ((short) 4999)　int nServAddlen = sizeof ( servAddr) // connect to the server retVal = connect (sHost, (LPSOCKADDR) &　servAddr, sizeof (servAddr))　if (SOCKET_ERROR == retVal) (printf ( " connect failed! \ n" )　closesocket (sHost) // Close socket WSACleanup () // release the socket resources return-1 )// to the server sending data ZeroMemory (buf, BUF_SZIE)　strcpy (buf, " MyTCP" )　retVal = send (sHost, buf, strlen (buf), 0)　if (SOCKET_ERROR == retVal) (printf ( " send failed! \ n" )　closesocket (sHost) // close the socket WSACleanup () // release socket resources to return