关于 c语言异步操作发布和订阅的问题。大概几以下几步
1 安装hiredis,https://github.com/redis/hiredis 进行下载安装,默认即可
2 安装redis,4.0版本以上。默认安装即可
3 安装libevent,2.2版本以上,与旧版本安装方法不太一样。
1 2 3 4 | $ mkdir build && cd build $ cmake .. $ make $ make install |
4 安装完libevent后,需要做个软连接,我这边是2.2版本的,默认安装到 /usr/local/lib/
1 2 3 | ln -s /usr/local/lib/libevent.so /usr/lib/libevent-2.2.so.1 ldconfig //让其马上生效 |
5 代码如下:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 | #include <stdio.h> #include <stdlib.h> #include <string.h> #include <signal.h> #include <hiredis.h> #include <async.h> #include <adapters/libevent.h> void subCallback(redisAsyncContext *c, void *r, void *priv) { redisReply *reply = (redisReply*)r; if (reply == NULL) return; if ( reply->type == REDIS_REPLY_ARRAY && reply->elements == 3 ) { if ( strcmp( reply->element[0]->str, "subscribe" ) != 0 ) { printf( "Received[%s] channel %s: %s\n", (char*)priv, reply->element[1]->str, reply->element[2]->str ); } } } void connectCallback(const redisAsyncContext *c, int status) { if (status != REDIS_OK) { printf("Error: %s\n", c->errstr); return; } printf("Connected...\n"); } void disconnectCallback(const redisAsyncContext *c, int status) { if (status != REDIS_OK) { printf("Error: %s\n", c->errstr); return; } printf("Disconnected...\n"); } int main (int argc, char **argv) { signal(SIGPIPE, SIG_IGN); struct event_base *base = event_base_new(); redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379); if (c->err) { /* Let *c leak for now... */ printf("Error: %s\n", c->errstr); return 1; } redisLibeventAttach(c,base); redisAsyncSetConnectCallback(c,connectCallback); redisAsyncSetDisconnectCallback(c,disconnectCallback); redisAsyncCommand(c, subCallback, (char*) "sub", "SUBSCRIBE deviceChannel"); event_base_dispatch(base); return 0; } |
使用客户端命令进行发布deviceChannel频道消息
执行程序后:
完美!!