c++ - 字符串和整数连接

Question

我必须将 fgets 的输出连接到 int (clientid)，并将其存储在 char[1024 ] 缓冲区。

这是我的代码:

clientid = rand() % 256;



while(1)
{
    cout<<"Client: Enter Data for Client=";

    fgets(buffer,MAXSIZE-1,stdin);

    if((send(sockfd,buffer,strlen(buffer),0))==-1)
    {
        cout<<"Failure Sending Message";
        close(sockfd);
        exit(1);
    }
    else
    {
        cout<<"Client:Message being sent:"<<buffer;
        num=recv(sockfd,buffer,sizeof(buffer),0);
        if(num<=0)
        {
            cout<<"either connection close or Error";
            break;
        }
        buffer[num]='\0';
        cout<<"Client:message received from Server:"<<buffer<<endl;
    }
}

close(sockfd);
return 0;

如何从服务器端的消息中提取clientid？

Answer 1

您可以将它添加到缓冲区本身的开头。例如，如果您的 clientid 是 123，那么您可以发送“123:Message”，其中“:”可以作为分隔符。这意味着您应该在缓冲区中提前读取那么多数字，而不是从头开始读取。

snprintf (buffer, sizeof(buffer), "%d:", clientid); // Add the clientid at the beginning before reading 
fgets(buffer + strlen (buffer),MAXSIZE-1,stdin);// Move by the len of buffer which contains clientid