使用TCP+winsock写的一个简单服务器程序（转）

本代码用VS2008编写：

 

//先打开服务器端，服务器在执行完recv()后堵塞，等待接收数据...
#include <winsock2.h>
#include <stdio.h>
#pragma comment(lib,"WS2_32.LIB")
void main()
{
    WSADATA          wsaData;
    SOCKET           ListeningSocket;
    SOCKET           NewConnection;
    SOCKADDR_IN      ServerAddr;
    SOCKADDR_IN      ClientAddr;
    char RecviverBuf[1024];
    int BufLength = 1024;
    int Port = 8060;
    int Ret;
    //初始化Winsock版本2.2
    if((Ret =WSAStartup(MAKEWORD(2,2),&wsaData)) != 0)
    {
        printf("ERROR:WSAStartup failed with %d/n",Ret);
        return;
    }
    //创建一个新的套接字来监听客户机链接
    if(INVALID_SOCKET == (ListeningSocket = socket(AF_INET,SOCK_STREAM,IPPROTO_TCP)))
    {
        printf("ERROR:SOCKET failed with %d/n",WSAGetLastError());
        WSACleanup();
        return;
    }
    //建立一个SOCKADDR_IN结构，这个结构告知bind我们想得到的8060端口监听所有接口上的连接
    ServerAddr.sin_family = AF_INET;
    ServerAddr.sin_port = htons(Port);
    ServerAddr.sin_addr.s_addr = htonl(INADDR_ANY);
    //使用bind将这个地址信息和套接字关联起来
    if(SOCKET_ERROR == bind(ListeningSocket,(SOCKADDR *)&ServerAddr,sizeof(ServerAddr)))
    {
        printf("ERROR:bind failed with %d/n",WSAGetLastError());
        closesocket(ListeningSocket);
        WSACleanup();
        return;
    }

    //监听客户机连接。这里使用5个backlog，许多应用程序一般都使用这个数量
    if(SOCKET_ERROR == listen(ListeningSocket,5))
    {
        printf("ERROR:listen failed with %d/n",WSAGetLastError());
        closesocket(ListeningSocket);
        WSACleanup();
        return;
    }
    //连接到达时，接受一个新的连接
    int ClientAddrLen = sizeof(ClientAddr);
    if(INVALID_SOCKET == (NewConnection = accept(ListeningSocket,(SOCKADDR *)&ClientAddr,&ClientAddrLen)))
    {
        printf("ERROR:accept failed with %d/n",WSAGetLastError());
        closesocket(ListeningSocket);
        WSACleanup();
        return;
    }
    printf("accept succeed!/n");
    //接受数据
    //注意recv()/send()和recvfrom()/sendto()的区别：使用recv()/send()需要先建立连接，而recvfrom()/sendto()不需要先建立连接...
    if(SOCKET_ERROR == recv(NewConnection,RecviverBuf,BufLength,0))
    {
        printf("ERROR:recv failed with %d/n",WSAGetLastError());
        closesocket(ListeningSocket);
        WSACleanup();
        return;
    }
    printf("recv succeed!/n");
    //显示接收到的数据
    for(int id=0; id<5 ;++id)
        printf("%c",RecviverBuf[id]);
    //完成接受新连接后，应该用closesocket API关闭这些套接字
    closesocket(NewConnection);
    closesocket(ListeningSocket);
    //应用程序完成对连接的处理后，调用WSACleanup
    WSACleanup();
}