Linux qtcreator编程使用redis客户端hiredis1. 安装hiredis，下载链接https://g

1. 安装hiredis，下载链接github.com/redis/hired…

这时redis自带的官方的C语言API。Linux安装很简单：

# cd {redis-src}
# cd deps/hiredis/
# make
# make install

现在hiredis已经被安装于/usr/local/include/hiredis/和/usr/local/lib/下。

2.qtcreator的.pro文件如下：

TEMPLATE = app
CONFIG += console
CONFIG -= app_bundle
CONFIG -= qt

#not good
#LIBS += -L /usr/local/lib -lhiredis
LIBS += "/usr/local/lib/libhiredis.a"

SOURCES += main.c

说明一下，如果使用QMAKE_LFLAGS += -lhiredis，等价于LIBS += /usr/local/lib/libhiredis.so

编译通过，但是运行时会报错：error while loading shared libraries:libhiredis.so.1: cannot open shared object file: No such file or directory
此时需要在/etc/ld.so.conf中加入libhiredis.so所在的目录:/usr/local/lib/
然后在终端执行命令，使之生效:
[root@localhost etc]# ldconfig\

3.demo

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <hiredis/hiredis.h>

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;
}