Redis C++编程实例

基本功能步骤：

1，下载安装Redis，下载地址：http://www.redis.cn/download.html。

2，下载安装hiredis，下载地址：https://github.com/redis/hiredis。

将libhiredis.so放到/usr/lib/目录下。

3，在hiredis-master目录下编写客户端程序。

#include <stdio.h>
#include "hiredis.h"

int main()
{
     redisContext *conn  = redisConnect("127.0.0.1",6379);
     if(conn != NULL && conn->err)
     {
         printf("connection error: %s
",conn->errstr);
         return 0;
     }
     redisReply *reply = (redisReply*)redisCommand(conn,"set foo 1234");
     freeReplyObject(reply);

     reply = redisCommand(conn,"get foo");
     printf("%s
",reply->str);
     freeReplyObject(reply);

     redisFree(conn);
     return 0;
}

编译命令：gcc -o redistest redistest.c -lhiredis

4，启动服务器，运行客户端程序。

Redis pub/sub功能实现。

发布pub功能：

#include <stdio.h>
#include <sys/time.h>
#include "hiredis.h"

int main()
{
     struct timeval begin;

     redisContext *conn  = redisConnect("127.0.0.1",6379);
     if(conn != NULL && conn->err)
     {
         printf("connection error: %s
",conn->errstr);
         return 0;
     }

     gettimeofday(&begin, NULL);
     redisReply *reply = (redisReply*)redisCommand(conn,"publish foo 1234");

     int sec, usec;
     sec = begin.tv_sec;
     usec = begin.tv_usec;

     printf("%d	%d
", sec, usec);

     freeReplyObject(reply);

     reply = redisCommand(conn,"get foo");
     printf("%s
",reply->str);
     freeReplyObject(reply);

     redisFree(conn);
     return 0;
}

订阅sub功能：

#include <sys/time.h>
#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) {
    struct timeval end;
    int sec, usec;

    redisReply *reply = r;
    if (reply == NULL) return;
    if ( reply->type == REDIS_REPLY_ARRAY && reply->elements == 3 ) {
        if ( strcmp( reply->element[0]->str, "subscribe" ) != 0 ) {

                gettimeofday(&end,NULL);

                sec = end.tv_sec;
                usec = end.tv_usec;
                printf("%d	%d
", sec, usec);

            printf( "Received[%s] channel %s: %s
",
                    (char*)priv,
                    reply->element[1]->str,
                    reply->element[2]->str );
        }
    }
}

void connectCallback(const redisAsyncContext *c, int status) {
    if (status != REDIS_OK) {
        printf("Error: %s
", c->errstr);
        return;
    }
    printf("Connected...
");
}

void disconnectCallback(const redisAsyncContext *c, int status) {
    if (status != REDIS_OK) {
        printf("Error: %s
", c->errstr);
        return;
    }
    printf("Disconnected...
");
}

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
", c->errstr);
        return 1;
    }

    redisLibeventAttach(c,base);
    redisAsyncSetConnectCallback(c,connectCallback);
    redisAsyncSetDisconnectCallback(c,disconnectCallback);
    redisAsyncCommand(c, subCallback, (char*) "sub", "SUBSCRIBE foo");

    event_base_dispatch(base);
    return 0;
}

pub编译命令同上，sub编译命令：gcc -o sub sub.c -lhiredis -levent

注意：

1，编译基本程序时可能需要建立链接：ln -s libhiredis.so libhiredis.so.0.12

2，1，订阅sub需要安装libevent-dev。