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我想比较客户端发送到服务器的一些数据。但是我的服务器在我的结果函数中的随机函数之后卡住了。它没有 printf (printf("Into IF");) 或进入 ifs,这是为什么呢?

等待传入连接...按 Ctrl+C 结束服务器

来自 127.0.0.1 的连接,端口 60697 收到消息:c Ramdom es 12

我的代码:

void
result(int sockfd)
{
    ssize_t     n;
    char        buf[MAXLINE];
    int         temp;
    time_t      ticks;
    int         i;
again:
    while ((n =read(sockfd, buf, MAXLINE)> 0))
    {
     buf[n] = '\0';
     printf("Message Recieved:%s\n",buf);
     srand (time(NULL));
     temp = rand() % 15+1;
     printf("Ramdom es %i\n",temp);
     printf("Into IF");  
     if ((strncmp (buf,"A",1) == 0) || (strncmp (buf,"a",1) == 0))
     {
      snprintf(buf, sizeof(buf), "You choose -%i tymes optin A on %.24s\r\n", temp,ctime(&ticks));
      Writen(sockfd, buf, n);

     }
     else if ((strncmp (buf,"B",1) == 0) || (strncmp (buf,"b",1) == 0))
     {
      snprintf(buf, sizeof(buf), "You choose -%i tymes optin B on on %.24s\r\n", temp,ctime(&ticks));
      Writen(sockfd, buf, n);

     }
     else
     {
       printf("Incorrect Input");
       Close(sockfd);
       break;
     }  
    }
    if (n < 0 && errno == EINTR)
    goto again;
    else if (n < 0)
        err_sys("read error");

}

int
main(int argc, char **argv)
{
    int                 listenfd, connfd;
    socklen_t           len;
    struct sockaddr_in  servaddr, cliaddr;
    char                buff[MAXLINE];
    /*char                message[MAXLINE];*/
    char                recvline[MAXLINE + 1];

    listenfd = Socket(AF_INET, SOCK_STREAM, 0);
    bzero(&servaddr, sizeof(servaddr));
    servaddr.sin_family      = AF_INET;
    servaddr.sin_addr.s_addr = htonl(INADDR_ANY);/*----------------------------------------------------*/
    servaddr.sin_port        = htons(5678); 

    Bind(listenfd, (SA *) &servaddr, sizeof(servaddr));
    Listen(listenfd, LISTENQ);
    printf("Server is running on 127.0.0.1, listening on port 5678\n");
    printf("\n");
    printf("Waiting for incoming connections...Press Ctrl+C to end server\n");

    for ( ; ; )
    {
        len = sizeof(cliaddr);
        connfd = Accept(listenfd, (SA *) &cliaddr, &len);

        /*Client connects to server*/
        printf("\n");
        printf("Connection from %s, port %d\n",
               Inet_ntop(AF_INET, &cliaddr.sin_addr, buff, sizeof(buff)),
               ntohs(cliaddr.sin_port));

        result(connfd);
            Close(connfd);
    }
}

谢谢!

4

1 回答 1

1

要打印printf添加“\n”(换行符),以便终端刷新并显示它。在您的代码中有几种情况,\n 将帮助您的 debug-printfs 出现。

这回答了“为什么 printf 不 printf”。我认为这不是你真正的问题。

于 2013-03-23T22:48:02.193 回答