C++ Socket TCP "Hello World!"

这是C++ SOCKET网络程序中的C/S结构之TCP "Hello World !"，共两个控制台工程：

//////////////////////////////////////////////////////////////////////////
// TCPServer.cpp

#include <stdio.h>
#include <WINSOCK2.H>

#pragma comment(lib,"WS2_32.lib")
#define BUF_SIZE    64      // 缓冲区大小

int main(void)
{
    WSADATA wsd;            // WSADATA变量
    SOCKET  sServer;        // 服务器套接字
    SOCKET  sClient;        // 客户端套接字
    int     retVal;         // 返回值
    char    buf[BUF_SIZE];  // 接受数据

    // 初始化套接字动态库
    ZeroMemory(buf,BUF_SIZE);
    if(WSAStartup(MAKEWORD(2,2),&wsd) != 0)
    {
        printf("WSAStartup failed !/n");
        return 1;
    }

    // 创建套接字
    sServer = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP);
    if(INVALID_SOCKET == sServer)
    {
        printf("socket failed !/n");
        WSACleanup();
        return -1;
    }

    // 服务器套接字地址
    SOCKADDR_IN addrServ;
    addrServ.sin_family = AF_INET;
    addrServ.sin_port = htons(4999);
    addrServ.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

    // 绑定套接字
    retVal = bind(sServer,(const struct sockaddr*)&addrServ,sizeof(SOCKADDR_IN));
    if(SOCKET_ERROR == retVal)
    {
        printf("bind failed !/n");
        closesocket(sServer);
        WSACleanup();
        return -1;
    }

    // 监听套接字
    retVal = listen(sServer,1);
    if(SOCKET_ERROR == retVal)
    {
        printf("listen failed !/n");
        closesocket(sServer);
        WSACleanup();
        return -1;
    }

    // 接受客户请求
    sockaddr_in addrClient;
    int addrClientlen = sizeof(addrClient);
    sClient = accept(sServer,(sockaddr FAR*)&addrClient,&addrClientlen);
    if(INVALID_SOCKET == sClient)
    {
        printf("accept failed !/n");
        closesocket(sServer);
        WSACleanup();
        return -1;
    }

    // 接受客户数据
    retVal = recv(sClient,buf,BUFSIZ,0);
    if(SOCKET_ERROR == retVal)
    {
        printf("recv failed !/n");
        closesocket(sServer);
        closesocket(sClient);
        WSACleanup();
        return -1;
    }

    // 退出程序
    printf("Recv From Client:%s/n",buf);
    retVal = send(sClient,"Hello World !",strlen("Hello World !"),0);
    if(SOCKET_ERROR == retVal)
    {
        printf("send failed !/n");
        closesocket(sServer);
        closesocket(sClient);
        WSACleanup();
        return -1;
    }

    // 退出程序
    closesocket(sServer);
    closesocket(sClient);
    WSACleanup();
    return 0;
}

//////////////////////////////////////////////////////////////////////////
// TCPClient.cpp

#include <stdio.h>
#include <Winsock2.H>

#pragma comment(lib,"WS2_32.lib")
#define BUF_SIZE    64          // 缓冲区大小

int main(void)
{
    WSADATA     wsd;            // 初始化<a href="http://lib.csdn.net/base/14" class='replace_word' title="MySQL知识库" target='_blank' style='color:#df3434; font-weight:bold;'>数据库</a>
    SOCKET      sHost;          // 服务器套接字
    SOCKADDR_IN servAddr;       // 服务器地址
    char        buf[BUF_SIZE];  // 接受数据缓冲区
    int         retVal;         // 返回值

    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();
        return -1;
    }

    // 设置服务器地址
    servAddr.sin_family = AF_INET;
    servAddr.sin_addr.S_un.S_addr = inet_addr("192.168.1.254");
    servAddr.sin_port = htons(4999);
    int sServerAddlen = sizeof(servAddr);

    // 连接服务器
    retVal = connect(sHost,(LPSOCKADDR)&servAddr,sizeof(servAddr));
    if(SOCKET_ERROR == retVal)
    {
        printf("connect failed !/n");
        closesocket(sHost);
        WSACleanup();
    }

    // 向服务器发送数据
    ZeroMemory(buf,BUF_SIZE);
    strcpy(buf,"Hello World !");
    retVal = send(sHost,buf,strlen(buf),0);
    if(SOCKET_ERROR == retVal)
    {
        printf("send failed !/n");
        closesocket(sHost);
        WSACleanup();
        return -1;
    }

    // 向服务器接受数据
    retVal = recv(sHost,buf,sizeof(buf)+1,0);
    printf("Recv From Server: %s/n",buf);

    // 退出程序
    closesocket(sHost);
    WSACleanup();
    return 0;
}

程序运行效果：

源代码下载地址：

http://download.csdn.net/source/1667113

http://www.rayfile.com/files/79dbe03a-a1fe-11de-83dd-0014221b798a/

http://blog.csdn.net/wangningyu/article/details/4556327