基于UDP的网络应用程序的编写

 

服务器端Code:

   
   

    
    //
    
     UdpSrv.cpp

    
    //
    
     [email protected]
    
    

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


    
    void
    
     main()
{
 
    
    //
    
    加载套接字库(该部分代码可重用，直接复制即可。)
    
    

    
     WORD wVersionRequested;
 WSADATA wsaData;
 
    
    int
    
     err;

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

 
    
    //
    
    创建套接字
    
    

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

 
    
    //
    
    绑定套接字
    
    

    
     SOCKADDR_IN addrSrc;
 addrSrc.sin_addr.S_un.S_addr 
    
    =
    
     htonl(INADDR_ANY);
 addrSrc.sin_family 
    
    =
    
     AF_INET;
 addrSrc.sin_port 
    
    =
    
     htons(
    
    6000
    
    );
 bind(sockSrv, (SOCKADDR 
    
    *
    
    )
    
    &
    
    addrSrc, 
    
    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
    
    "
    
    , recvBuf);
 
 
    
    //
    
    关闭套接字
    
    

    
     closesocket(sockSrv);
 WSACleanup();
 getchar();
}
   
   

 

 

客户端Code:

    
    

     
     //
     
      UdpClient.cpp

     
     //
     
      [email protected]
     
     

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


     
     void
     
      main()
{
 
     
     //
     
     加载套接字库(该部分代码可重用，直接复制即可。)
     
     

     
      WORD wVersionRequested;
 WSADATA wsaData;
 
     
     int
     
      err;

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

 
     
     //
     
     创建套接字
     
     

     
      SOCKET sockClient 
     
     =
     
      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(sockClient, 
     
     "
     
     I am Deng!
     
     "
     
     , 
     
     sizeof
     
     (
     
     "
     
     I am Deng!
     
     "
     
     ) 
     
     +
     
      
     
     1
     
     , 
     
     0
     
     , (SOCKADDR 
     
     *
     
     )
     
     &
     
     addrSrv, 
     
     sizeof
     
     (SOCKADDR));

 
     
     //
     
     关闭套接字
     
     

     
      closesocket(sockClient);
 WSACleanup();
 getchar();
}