用c++写一个rabbitmq消费者的代码

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <stdbool.h>
#include <amqp.h>
#include <amqp_tcp_socket.h>

int main(int argc, char *argv[]) {
char const *hostname;
int port, status;
char const *exchange;
char const *bindingkey;
amqp_socket_t *socket = NULL;
amqp_connection_state_t conn;

amqp_bytes_t queuename;

if (argc < 5) {
fprintf(stderr, "Usage: amqp_listen host port exchange bindingkey\n");
return 1;
}

hostname = argv[1];
port = atoi(argv[2]);
exchange = argv[3];
bindingkey = argv[4];

conn = amqp_new_connection();

socket = amqp_tcp_socket_new(conn);
if (!socket) {
fprintf(stderr, "creating TCP socket\n");
return 1;
}

status = amqp_socket_open(socket, hostname, port);
if (status) {
fprintf(stderr, "opening TCP socket\n");
return 1;
}

amqp_login(conn, "/", 0, 131072, 0, AMQP_SASL_METHOD_PLAIN, "guest", "guest");
amqp_channel_open(conn, 1);
amqp_get_rpc_reply(conn);

{
amqp_queue_declare_ok_t *r = amqp_queue_declare(conn, 1, amqp_empty_bytes, 0, 0, 0, 1, amqp_empty_table);
queuename = amqp_bytes_malloc_dup(r->queue);
if (queuename.bytes == NULL) {
fprintf(stderr, "Out of memory while copying queue name");
return 1;
}
}

amqp_queue_bind(conn, 1, queuename, amqp_cstring_bytes(exchange), amqp_cstring_bytes(bindingkey), amqp_empty_table);
amqp_get_rpc_reply(conn);

{
amqp_basic_consume(conn, 1, queuename, amqp_empty_bytes, 0, 1, 0, amqp_empty_table);
amqp_get_rpc_reply(conn);

{
while (1) {
amqp_rpc_reply_t res;
amqp_envelope_t envelope;

amqp_maybe_release_buffers(conn);

res = amqp_consume_message(conn, &envelope, NULL, 0);

if (AMQP_RESPONSE_NORMAL != res.reply_type) {
break;
}

printf("Delivery %u, exchange %.*s routingkey %.*s\n",
(unsigned) envelope.delivery_tag,
(int) envelope.exchange.len, (char *) envelope.exchange.bytes,
(int) envelope.routing_key.len, (char *) envelope.routing_key.bytes);

if (envelope.message.properties._flags & AMQP_BASIC_CONTENT_TYPE_FLAG) {
printf("Content-type: %.*s\n",
(int) envelope.message.properties.content_type.len,
(char *) envelope.message.properties.content_type.bytes);
}
printf("----\n");

amqp_dump(envelope.message.body.bytes, envelope.message.body.len);

amqp_destroy_envelope(&envelope);
}
}
}

amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS);
amqp_connection_close(conn, AMQP_REPLY_SUCCESS);
amqp_destroy_connection(conn);

return 0;
}