基于TCP与UDP的简单聊天程序

基于TCP的网络应用程序的编写

1.服务器端程序

#include 
#include 

#pragma comment(lib,"Ws2_32.lib")
void main()
{
    //加载套接字库
    WORD wVersionRequested; //加载的Winsock库的版本
    WSADATA wsaData;    //库版本的有关信息
    int err;

    wVersionRequested = MAKEWORD( 1, 1 );   //用 MAKEWORD 宏请求一个1.1版本的WinSock库

    err = WSAStartup( wVersionRequested, &wsaData );//用WSAStartup()来加载套接字库
    if( err != 0)   //不等于 0 表示加载套接字库不成功
        return;

    if( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1 )//如果低位字节不等于1 或 高位字节不等于 1则
    {
        WSACleanup();//释放为该应用程序分配的资源，终止对WinSock 动态库的使用
        return;
    }

    //创建用于监听的套接字
    SOCKET sockSrv = socket( AF_INET, SOCK_STREAM, 0 );

    SOCKADDR_IN addrSrv;    //地址结构体
    //用htonl()将主机字节序转换为网络字节序,INADDR_ANY表示允许套接字向任何分配给本地机器的IP地址发送或接收数据
    addrSrv.sin_addr.S_un.S_addr = htonl(INADDR_ANY);
    addrSrv.sin_family           = AF_INET; //地址家族，对于TCP/IP协议的地址族， 只能是AF_INET 或PF_INET
    addrSrv.sin_port             = htons(6000);//指定端口号的时候 必须知道1024 以上的值

    //绑定套接字
    bind( sockSrv, (sockaddr *)&addrSrv, sizeof(sockaddr) );

    //将套接字设置为监听模式，准备接收客户请求
    listen( sockSrv, 5 );//等待队列为5

    SOCKADDR_IN addrClient;
    int len = sizeof(SOCKADDR);

    while(1)
    {
        //接受客户请求
        SOCKET sockConn = accept( sockSrv, (sockaddr  *)&addrClient, &len );
        char sendBuf[100];
        sprintf( sendBuf, "Hello!");

        //发送数据
        send( sockConn, sendBuf, strlen(sendBuf) + 1, 0);

        char recvBuf[100];
        //接收数据
        recv( sockConn, recvBuf, 100,0 );

        //打印接收的数据
        printf("%s\n",recvBuf);

        //关闭套接字
        closesocket(sockConn);
    }
}

2.客户端程序代码

#include 
#include 

#pragma comment(lib,"Ws2_32.lib")

void main()
{
    //加载套接字库
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;

    wVersionRequested = MAKEWORD( 1, 1 );
    err = WSAStartup( wVersionRequested, &wsaData );
    if( err != 0 )
        return;
    if( LOBYTE( wsaData.wVersion ) != 1 ||
        HIBYTE( wsaData.wVersion ) != 1)
    {
        WSACleanup();
        return;
    }

    //创建套接字
    SOCKET sockClient = socket( AF_INET, SOCK_STREAM, 0 );

    //服务器地址信息
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = inet_addr( "127.0.0.1" );
    addrSrv.sin_family           = AF_INET;
    addrSrv.sin_port             = htons(6000);

    //向服务器发出连接请求
    connect( sockClient, (sockaddr *)&addrSrv, sizeof( sockaddr ) );

    //接收数据
    char recvBuf[100];
    recv( sockClient, recvBuf, 100, 0 );
    printf( "%s\n", recvBuf );

    //发送数据
    send( sockClient, "I'm ZhaoLong!",sizeof( "I'm ZhaoLong!" ) + 1,0 );

    //关闭套接字
    closesocket(sockClient);
    WSACleanup();
}

3.运行结果

---

基于UDP的网络应用程序的编写

1.服务器端程序

#include 
#include 
#pragma comment(lib,"Ws2_32.lib")
void main()
{
    //加载套接字库
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;

    wVersionRequested = MAKEWORD( 1, 1 );
    err = WSAStartup( wVersionRequested, &wsaData );
    if( err != 0)
        return;
    if( LOBYTE( wsaData.wVersion ) != 1  ||
        HIBYTE( wsaData.wVersion ) != 1  )
    {
        WSACleanup();
        return;
    }

    //创建套接字
    SOCKET sockSrv = socket( AF_INET, SOCK_DGRAM, 0 );
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = htonl( INADDR_ANY );
    addrSrv.sin_family           = AF_INET;
    addrSrv.sin_port             = htons( 6000 );

    //绑定套接字
    bind( sockSrv, (SOCKADDR *)&addrSrv, sizeof(SOCKADDR) );

    //等待并接收数据
    SOCKADDR_IN addrClient;
    int len = sizeof(SOCKADDR);
    char recvBuf[100];
    recvfrom( sockSrv, recvBuf, 100, 0,(SOCKADDR *)&addrClient, &len );
    printf("%s\n",recvBuf);

    //关闭套接字
    closesocket( sockSrv );
    WSACleanup();
}

2.客户端程序

#include 
#include 
#pragma comment(lib,"Ws2_32.lib")
void main()
{
    //加载套接字库
    WORD wVersionRequested;
    WSADATA wsaData;
    int err;

    wVersionRequested = MAKEWORD( 1, 1 );
    err = WSAStartup( wVersionRequested, &wsaData );
    if( err != 0)
        return;
    if( LOBYTE( wsaData.wVersion ) != 1  ||
        HIBYTE( wsaData.wVersion ) != 1  )
    {
        WSACleanup();
        return;
    }

    //创建套接字
    SOCKET socketClient = socket( AF_INET, SOCK_DGRAM, 0 );
    SOCKADDR_IN addrSrv;
    addrSrv.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");
    addrSrv.sin_family           = AF_INET;
    addrSrv.sin_port             = htons( 6000 );

    //发送数据
    sendto( socketClient, "Hello!",strlen("Hello!" )+ 1, 0, 
        (SOCKADDR *)&addrSrv, sizeof( SOCKADDR ) );

    //关闭套接字
    closesocket(socketClient);
    WSACleanup();
}

3.运行结果