UDP Socket编程 C/C++

//services
#pragma comment (lib,"ws2_32.lib")

#include <Winsock2.h>

#include <stdio.h>



void main()

{

    //版本协商

    WORD wVersionRequested;

    WSADATA wsaData;

    int err;



    wVersionRequested = MAKEWORD( 1, 1 );



    err = WSAStartup( wVersionRequested, &wsaData );

    if ( err != 0 ) {

        /* Tell the user that we could not find a usable */

        /* WinSock DLL.                                  */

        return;

    }



    /* Confirm that the WinSock DLL supports 2.2.*/

    /* Note that if the DLL supports versions greater    */

    /* than 2.2 in addition to 2.2, it will still return */

    /* 2.2 in wVersion since that is the version we      */

    /* requested.                                        */



    if ( LOBYTE( wsaData.wVersion ) != 1 ||

        HIBYTE( wsaData.wVersion ) != 1) {

        /* Tell the user that we could not find a usable */

        /* WinSock DLL.                                  */

        WSACleanup( );

        return;

    }



    /* The WinSock DLL is acceptable. Proceed. */

    //创建数据报套接字

    SOCKET svr = socket(AF_INET,SOCK_DGRAM,0);

    //创建本地地址信息

    SOCKADDR_IN addr;

    addr.sin_family = AF_INET;

    addr.sin_port = htons(6000);

    addr.sin_addr.S_un.S_addr = htonl(INADDR_ANY);

    int len = sizeof(sockaddr);

    bind(svr,(sockaddr*)&addr,len);

    //创建客户端地址对象

    SOCKADDR_IN addrClient;

    char recvBuf[128];

    char sendBuf[128];

    char tempBuf[256];



    while(true)

    {

        //接收数据

        recvfrom(svr,recvBuf,128,0,(sockaddr*)&addrClient,&len);

        char* ipClient = inet_ntoa(addrClient.sin_addr);

        sprintf(tempBuf,"%s said: %s\n",ipClient,recvBuf);

        printf("%s",tempBuf);

        gets(sendBuf);

        //发送数据

        sendto(svr,sendBuf,strlen(sendBuf)+1,0,(sockaddr*)&addrClient,len);

    }

    closesocket(svr);

    WSACleanup();

}

//client

#pragma comment (lib,"ws2_32.lib")

#include <Winsock2.h>

#include <stdio.h>



void main()

{

    //版本协商

    WORD wVersionRequested;

    WSADATA wsaData;

    int err;



    wVersionRequested = MAKEWORD( 1, 1 );



    err = WSAStartup( wVersionRequested, &wsaData );

    if ( err != 0 ) {

        /* Tell the user that we could not find a usable */

        /* WinSock DLL.                                  */

        return;

    }



    /* Confirm that the WinSock DLL supports 2.2.*/

    /* Note that if the DLL supports versions greater    */

    /* than 2.2 in addition to 2.2, it will still return */

    /* 2.2 in wVersion since that is the version we      */

    /* requested.                                        */



    if ( LOBYTE( wsaData.wVersion ) != 1 ||

        HIBYTE( wsaData.wVersion ) != 1 ) {

        /* Tell the user that we could not find a usable */

        /* WinSock DLL.                                  */

        WSACleanup( );

        return;

    }



    /* The WinSock DLL is acceptable. Proceed. */

    //创建服务器套接字

    SOCKET Svr = socket(AF_INET,SOCK_DGRAM,0);

    //创建地址

    SOCKADDR_IN addrSvr;

    addrSvr.sin_family = AF_INET;

    addrSvr.sin_port = htons(6000);

    addrSvr.sin_addr.S_un.S_addr = inet_addr("127.0.0.1");

    char recvBuf[128];

    char sendBuf[128];

    int len = sizeof(sockaddr);



    while(true)

    {

        gets(sendBuf);

        //发送数据

        sendto(Svr,sendBuf,strlen(sendBuf)+1,0,(sockaddr*)&addrSvr,len);

        //接收数据

        recvfrom(Svr,recvBuf,128,0,(sockaddr*)&addrSvr,&len);

        char* ipSvr = inet_ntoa(addrSvr.sin_addr);

        printf("%s said: %s\n",ipSvr,recvBuf);

    }

    closesocket(Svr);

    WSACleanup();

}