38 lines
1.2 KiB
C
38 lines
1.2 KiB
C
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//
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// 气象信息客户端
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// 连接SUB套接字至tcp://*:5556端点
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// 收集指定邮编的气象信息，并计算平均温度
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//
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#include "zhelpers.h"
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int main (int argc, char *argv [])
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{
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void *context = zmq_init (1);
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// 创建连接至服务端的套接字
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printf ("正在收集气象信息...\n");
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void *subscriber = zmq_socket (context, ZMQ_SUB);
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zmq_connect (subscriber, "tcp://localhost:5556");
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// 设置订阅信息，默认为纽约，邮编10001
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char *filter = (argc > 1)? argv [1]: "10001 ";
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zmq_setsockopt (subscriber, ZMQ_SUBSCRIBE, filter, strlen (filter));
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// 处理100条更新信息
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int update_nbr;
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long total_temp = 0;
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for (update_nbr = 0; update_nbr < 100; update_nbr++) {
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char *string = s_recv (subscriber);
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int zipcode, temperature, relhumidity;
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sscanf (string, "%d %d %d",
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&zipcode, &temperature, &relhumidity);
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total_temp += temperature;
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free (string);
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}
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printf ("地区邮编 '%s' 的平均温度为 %dF\n",
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filter, (int) (total_temp / update_nbr));
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zmq_close (subscriber);
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zmq_term (context);
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return 0;
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}
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