我尝试使用 ZeroMQ 指南中的天气示例和epgm://
传输类。起初我的代码:
// Publisher
#include "zhelpers.h"
int main (void) {
// Prepare our context and publisher
void *context = zmq_ctx_new ();
void *publisher = zmq_socket ( context, ZMQ_PUB );
// int rc = zmq_bind ( publisher, "tcp://*:5556" );
int rc = zmq_bind ( publisher, "epgm://192.168.1.4;224.0.0.251:5556" );
assert ( rc == 0 );
// Initialize random number generator
srandom ( (unsigned) time (NULL) );
while (1) {
// Get values that will fool the boss
int zipcode, temperature, relhumidity;
zipcode = randof (100000);
temperature = randof (215) - 80;
relhumidity = randof (50) + 10;
// Send a message to all subscribers
char update [20];
sprintf ( update, "%05d %d %d", zipcode, temperature, relhumidity );
s_send ( publisher, update );
}
zmq_close ( publisher );
zmq_ctx_destroy ( context );
return 0;
}
// Subscriber
#include "zhelpers.h"
int main ( int argc, char *argv [] )
{
// Socket to talk to server
printf ( "Collecting updates from weather server…\n" );
void *context = zmq_ctx_new ();
void *subscriber = zmq_socket ( context, ZMQ_SUB );
// int rc = zmq_connect ( subscriber, "tcp://192.168.1.4:5556" );
int rc = zmq_connect ( subscriber, "epgm://192.168.1.9;224.0.0.251:5556" );
assert ( rc == 0 );
// Subscribe to zipcode, default is NYC, 10001
char *filter = ( argc > 1 )? argv [1]: "10001 ";
rc = zmq_setsockopt ( subscriber, ZMQ_SUBSCRIBE,
filter, strlen (filter) );
assert ( rc == 0 );
// Process 100 updates
int update_nbr;
long total_temp = 0;
for ( update_nbr = 0; update_nbr < 100; update_nbr++ ) {
char *string = s_recv ( subscriber );
int zipcode, temperature, relhumidity;
sscanf ( string, "%d %d %d",
&zipcode, &temperature, &relhumidity );
total_temp += temperature;
free ( string );
}
printf ( "Average temperature for zipcode '%s' was %dF\n",
filter, (int) ( total_temp / update_nbr ) );
zmq_close ( subscriber );
zmq_ctx_destroy ( context );
return 0;
}
- 我已经
tcp://
在同一主机上尝试过这段代码(见评论),它工作正常。 - 我用这个Openbook Linux示例(使用我的多播地址)尝试了多播地址,并收到了消息。
- 我安装了 ZeroMQ
pgm://
(在我遇到断言错误之前)。 - 我的主机都是 Ubuntu 16.04 系统
- 我正在使用 ZeroMQ 4
我的问题是我没有收到任何消息epgm://
。两个程序都在运行,但没有收到任何消息。我错过了什么?我不明白可能出了什么问题。