vc winapi 网络编程

// Client.cpp : Defines the entry point for the console application. // #include "stdafx.h" #define BUF_SZIE 64 #include "winsock2.h" #pragma comment(lib, "ws2_32.lib") int main(int argc, char* argv[]) { WSADATA wsd; //WSADATA变量 SOCKET sHost; //服务器套接字 SOCKADDR_IN servAddr; //服务器地址 char buf[BUF_SZIE]; //接收数据缓冲区 int retVal; //返回值 //初始化套结字动态库 if (WSAStartup(MAKEWORD(2,2), &wsd) != 0) { printf("WSAStartup failed!\n"); return -1; } //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; } //退出 closesocket(sHost); //关闭套接字 WSACleanup(); //释放套接字资源 return 0; }