最简单的使用redis自带程序实现c程序远程访问redis服务-白红宇

最简单的使用redis自带程序实现c程序远程访问redis服务

阅读量：4066 次

发布时间：2019-05-25

本文共 2318 字，大约阅读时间需要 7 分钟。

代码在下面，包含主要头文件 hiredis.h 用来定义与服务端的连接

函数 redisConnectWithTimeout 用来连接，有超时设置；

函数 redisCommand 用来执行命令

函数 freeReplyObject 和函数redisFree 用来释放之前的资源。

整体代码比较简单，主要是执行命令。

#include 
   
    #include 
    
     #include 
     
      #include 
      
       int main(int argc, char **argv) {    unsigned int j;    redisContext *c;    redisReply *reply;    const char *hostname = (argc > 1) ? argv[1] : "127.0.0.1";    int port = (argc > 2) ? atoi(argv[2]) : 6379;    struct timeval timeout = { 1, 500000 }; // 1.5 seconds    c = redisConnectWithTimeout(hostname, port, timeout);    if (c == NULL || c->err) {        if (c) {            printf("Connection error: %s\n", c->errstr);            redisFree(c);        } else {            printf("Connection error: can't allocate redis context\n");        }        exit(1);    }    /* PING server */    reply = redisCommand(c,"PING");    printf("PING: %s\n", reply->str);    freeReplyObject(reply);    /* Set a key */    reply = redisCommand(c,"SET %s %s", "foo", "hello world");    printf("SET: %s\n", reply->str);    freeReplyObject(reply);    /* Set a key using binary safe API */    reply = redisCommand(c,"SET %b %b", "bar", (size_t) 3, "hello", (size_t) 5);    printf("SET (binary API): %s\n", reply->str);    freeReplyObject(reply);    /* Try a GET and two INCR */    reply = redisCommand(c,"GET foo");    printf("GET foo: %s\n", reply->str);    freeReplyObject(reply);    reply = redisCommand(c,"INCR counter");    printf("INCR counter: %lld\n", reply->integer);    freeReplyObject(reply);    /* again ... */    reply = redisCommand(c,"INCR counter");    printf("INCR counter: %lld\n", reply->integer);    freeReplyObject(reply);    /* Create a list of numbers, from 0 to 9 */    reply = redisCommand(c,"DEL mylist");    freeReplyObject(reply);    for (j = 0; j < 10; j++) {        char buf[64];        snprintf(buf,64,"%u",j);        reply = redisCommand(c,"LPUSH mylist element-%s", buf);        freeReplyObject(reply);    }    /* Let's check what we have inside the list */    reply = redisCommand(c,"LRANGE mylist 0 -1");    if (reply->type == REDIS_REPLY_ARRAY) {        for (j = 0; j < reply->elements; j++) {            printf("%u) %s\n", j, reply->element[j]->str);        }    }    freeReplyObject(reply);    /* Disconnects and frees the context */    redisFree(c);    return 0;}