面向连接例子

VC6.0下，创建两个 win32 Console Application

project-->setting-->link 下的object/library modules: 添加 wsock32.lib

服务器步骤：

WSAStartup

socket

bind

listen

recv/send

closesocket

WSACleanup

客户端步骤：

WSAStartup

socket

connect

recv/send

closesocket

WSACleanup

服务器代码：

#include "stdafx.h"#include <winsock2.h>int main(int argc, char **argv){SOCKET sServer, sClient;WSADATA wsaData;struct sockaddr_in addr_server, addr_client;char send_msg[] = "Hello, I'm server.";const int MAX_RECVMSG = 1024;char recv_msg[MAX_RECVMSG];if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0){printf("WSAStartup() failed!\n");return 1;}sServer = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (sServer == SOCKET_ERROR){printf("socket() failed!\n");return 1;}addr_server.sin_port = htons(5152);addr_server.sin_family = AF_INET;addr_server.sin_addr.s_addr = htonl(INADDR_ANY);if (bind(sServer, (sockaddr*)&addr_server, sizeof(addr_server)) == SOCKET_ERROR){printf("bind() failed!\n");return 1;}if (listen(sServer, SOMAXCONN) == SOCKET_ERROR){printf("listen() failed!\n");return 1;}while (1){int ret;int iAddrSize = sizeof(addr_client);sClient = accept(sServer, (sockaddr*)&addr_client, &iAddrSize);if (sClient == INVALID_SOCKET){printf("accept() failed!\n");return 1;}        printf("Accepted client: %s:%d\n",             inet_ntoa(addr_client.sin_addr), ntohs(addr_client.sin_port));    //sendprintf("send_msg:%s\n", send_msg);ret = send(sClient, send_msg, strlen(send_msg), 0);if (ret == SOCKET_ERROR){printf("send() failed!\n");return 1;}//recvret = recv(sClient, recv_msg, MAX_RECVMSG, 0);if (ret == 0){printf("recv() = 0");return 1;}else if (ret < 0){printf("recv() failed!\n");return 1;}recv_msg[ret] = '\0';printf("recv_msg:%s\n", recv_msg);}closesocket(sServer);        WSACleanup();return 0;}

客户端代码：

#include "stdafx.h"#include <winsock2.h>int main(int argc, char **argv){SOCKET sClient;WSADATA wsaData;struct sockaddr_in addr_server;char send_msg[] = "Hello, I'm client.";const int MAX_RECVMSG = 1024;char recv_msg[MAX_RECVMSG];if (WSAStartup(MAKEWORD(2,2), &wsaData) != 0){printf("WSAStartup() failed!\n");return 1;}sClient = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if (sClient == SOCKET_ERROR){printf("socket() failed!\n");return 1;}addr_server.sin_port = htons(5152);addr_server.sin_family = AF_INET;addr_server.sin_addr.s_addr = inet_addr("127.0.0.1");if (connect(sClient, (struct sockaddr*)&addr_server, sizeof(addr_server)) == SOCKET_ERROR){printf("connect() failed!\n");return 1;}printf("Accepted server: %s:%d\n",             inet_ntoa(addr_server.sin_addr), ntohs(addr_server.sin_port));int ret;    //sendprintf("send_msg:%s\n", send_msg);ret = send(sClient, send_msg, strlen(send_msg), 0);if (ret == SOCKET_ERROR){printf("send() failed!\n");return 1;}//recvret = recv(sClient, recv_msg, MAX_RECVMSG, 0);if (ret == 0){printf("recv() = 0");return 1;}else if (ret < 0){printf("recv() failed!\n");return 1;}recv_msg[ret] = '\0';printf("recv_msg:%s\n", recv_msg);closesocket(sClient);        WSACleanup();return 0;}