服务端

#include <winsock2.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>#pragma comment(lib, "Ws2_32.lib")void error_handing(const char* message)
{fputs(message, stderr);fputc('\n', stderr);exit(1);
}
int main(int argc, char* argv[])
{WSADATA wsaData;if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0){error_handing("WSAStartup() error");}SOCKET hServSock, hClntSock;SOCKADDR_IN servAddr, clntAddr;int szClntAddr;char message[] = "hello world!";if (argc != 2){printf("Usage : %s <port>\n", argv[0]);exit(1);}hServSock = socket(AF_INET, SOCK_STREAM, 0);if (hServSock == INVALID_SOCKET){error_handing("socket() error");}memset(&servAddr, 0, sizeof(servAddr));servAddr.sin_family = AF_INET;servAddr.sin_addr.s_addr = htonl(INADDR_ANY);servAddr.sin_port = htons(atoi(argv[1]));if (bind(hServSock, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR){error_handing("bind() error");}if (listen(hServSock, 5) == SOCKET_ERROR){error_handing("listen() error");}szClntAddr = sizeof(clntAddr);hClntSock = accept(hServSock, (SOCKADDR*)&clntAddr, &szClntAddr);if (hClntSock == INVALID_SOCKET){error_handing("accept() error");}closesocket(hClntSock);closesocket(hServSock);WSACleanup();return 0;
}

客户端

#define _WINSOCK_DEPRECATED_NO_WARNINGS#include <winsock2.h>
#include <string.h>
#include <stdio.h>
#include <stdlib.h>#pragma comment(lib, "Ws2_32.lib")void error_handing(const char* message)
{fputs(message, stderr);fputc('\n', stderr);exit(1);
}int main(int argc, char* argv[])
{WSADATA wsaData;if (WSAStartup(MAKEWORD(2, 2), &wsaData) != 0){error_handing("WSAStartup() error");}SOCKET hSocket;if (argc != 3){error_handing("argc error");}hSocket = socket(AF_INET, SOCK_STREAM, 0);SOCKADDR_IN servAddr;memset(&servAddr, 0, sizeof(servAddr));servAddr.sin_family = AF_INET;servAddr.sin_addr.S_un.S_addr = inet_addr(argv[1]);servAddr.sin_port = htons(atoi(argv[2]));if (connect(hSocket, (SOCKADDR*)&servAddr, sizeof(servAddr)) == SOCKET_ERROR){error_handing("connect error");}char message[30];int strlen = recv(hSocket, message, sizeof(message) - 1, 0);if (strlen == -1){error_handing("recv error");}printf("recv message: %s\n", message);closesocket(hSocket);WSACleanup();return 0;
}