Question

我有一个在UDP上运行的客户端 - 服务器应用程序（我需要UDP而不是TCP）。客户端可以向服务器发送消息，它正常工作，反之亦然。我希望客户端能够将消息作为“_connect game1 10”传递并在服务器上相应地触发一个名为_connect（char * name，int num）的函数。如何执行此操作来分析每个命令以触发哪个命令？序列化是一种解决方案，以及如何实现它。

Answer 1

您可以执行以下步骤 1.创建消息结构

    typedef struct info
    {
        char clientReq[MAX_LENGTH];
        char sub[MAX_LENGTH];
        u_int32_t value;
        u_int16_t end; //Set for the packet which closes the connection 

     }messageInfo;

在客户端

创建套接字并在本地绑定//并连接到服务器套接字（可选）

fd = socket( family, SOCK_DGRAM, 0 );
//handle error
struct sockaddr_in         peerV4;
struct sockaddr_in         clientV4;
rc = bind(fd,(struct sockaddr *) &clientV4,
                         sizeof clientV4);
//error handling

将数据包数据发送到服务器。

    //update peer(server) socket info here
    peerV4.sin_family = AF_INET;
    peerV4.sin_port = htons(serverPort);
    peerV4.sin_addr.s_addr = "x.x.x.x";
    uint8_t *tBuf = (uint8_t *)malloc(sizeof (info)); //memset to zero
    info *pHeader = (info *)tBuf;
    pHeader->value = htonl(10); //local value to send
    pHeader->end = htons(0);
    pHeader->clientReq  = "connect";
    pheader->sub = "game1";
    sendto(serverSock, tBuf, sizeof(info),0
                                 ,(struct sockaddr *) &peerV4,
                                 sizeof(peerV4));

发送最后一个数据包并关闭本地套接字。

   pHeader->end = htons(1); // so the server closes the socket
   //send packet
   close(fd);

在服务器上 1.创建UDP套接字，绑定到本地地址等待客户端向您发送数据并使用recvfrom

      fd = socket( family, SOCK_DGRAM, 0 );
      //bind socket
      uint8_t *recvBuf = (uint8_t *)malloc(sizeof(info));
      info *pheader = (info *)recvBuf;
      int currLen = recvfrom( fd, recvBuf,
                  mBufLen),0,(struct sockaddr *)&peerV4,
                     &sockaddrLen);
      //error handling
      if(currLen > 0)
      {
           if(htons(pheader->end) == 1)
             //close socket
           char *localSub = pheader->sub;
           char *localRecv = pheader->clientReq;
           //do something with the values on the server like
           if (strcasecmp(localRecv,"connect")     == 0) //pseudo
                connect(sub,pheader->value)
      }

C从客户端向服务器提交命令

1 个答案: