标题：[实践OK]redis C接口hiredis 简单函数使用介绍
出处：向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除
时间：Wed, 06 Sep 2017 10:14:55 +0000
作者：jackxiang
地址：http://jackxiang.com/post/9445/

内容：
背景：搞一些Nginx的扩展啥的都用那个hiredis进行静态编译后，编译进Nginx，这儿先研究一下这个Redis的C连接认证以及取数据先。

代码@/usr/local/src/hiredis：

#include <stdio.h>
#include <stdlib.h>
#include <stddef.h>
#include <stdarg.h>
#include <string.h>
#include <assert.h>
#include <hiredis/hiredis.h>

void doTest()
{
    //redis默认监听端口为6387 可以再配置文件中修改
    redisContext* c = redisConnect("127.0.0.1", 6379);
    if ( c->err)
    {
        redisFree(c);
        printf("Connect to redisServer faile\n");
        return ;
    }
    printf("Connect to redisServer Success\n");

    //验证
    const char* password = "XjackMe42108";
    redisReply* r = (redisReply *)redisCommand(c, "auth %s", password);
    if (r->type == REDIS_REPLY_ERROR) {
        printf("Authentication failure\n");
    } else {
            printf("Authentication success\n");
    }

    const char* command1 = "set stest1 value1";
    r = (redisReply*)redisCommand(c, command1);

    if( NULL == r)
    {
        printf("Execut command1 failure\n");
        redisFree(c);
        return;
    }
    if( !(r->type == REDIS_REPLY_STATUS && strcasecmp(r->str,"OK")==0))
    {
        printf("Failed to execute command[%s]\n",command1);
        freeReplyObject(r);
        redisFree(c);
        return;
    }
    freeReplyObject(r);
    printf("Succeed to execute command[%s]\n", command1);

    const char* command2 = "strlen stest1";
    r = (redisReply*)redisCommand(c, command2);
    if ( r->type != REDIS_REPLY_INTEGER)
    {
        printf("Failed to execute command[%s]\n",command2);
        freeReplyObject(r);
        redisFree(c);
        return;
    }
    int length =  r->integer;
    freeReplyObject(r);
    printf("The length of 'stest1' is %d.\n", length);
    printf("Succeed to execute command[%s]\n", command2);


    const char* command3 = "get stest1";
    r = (redisReply*)redisCommand(c, command3);
    if ( r->type != REDIS_REPLY_STRING)
    {
        printf("Failed to execute command[%s]\n",command3);
        freeReplyObject(r);
        redisFree(c);
        return;
    }
    printf("The value of 'stest1' is %s\n", r->str);
    freeReplyObject(r);
    printf("Succeed to execute command[%s]\n", command3);

    const char* command4 = "get stest2";
    r = (redisReply*)redisCommand(c, command4);
    if ( r->type != REDIS_REPLY_NIL)
    {
        printf("Failed to execute command[%s]\n",command4);
        freeReplyObject(r);
        redisFree(c);
        return;
    }
    freeReplyObject(r);
    printf("Succeed to execute command[%s]\n", command4);


    redisFree(c);

}

int main()
{
    doTest();
    return 0;

}


编译一下：
gcc redisTest.c /home/test/rpmbuild/BUILD/ngx_http_monitor_module-2.2.0/hiredis/libhiredis.a -I/home/test/rpmbuild/BUILD/ngx_http_monitor_module-2.2.0/ 
关于头文件之 linux下C include搜索的路径：http://blog.csdn.net/chosen0ne/article/details/7210946
编译静态的resis静态链接库make static,别make 会生成动态连接库，如果只指定 -L路径，会弄成了动态编译，有依赖SO的情况，静态文件大点无所谓了:
  cd hiredis
  make clean
  make static
静态编译出来就是这样的：
ldd a.out 
        linux-vdso.so.1 =>  (0x00007ffeec95e000)
        libc.so.6 => /lib64/libc.so.6 (0x0000003771400000)
        /lib64/ld-linux-x86-64.so.2 (0x0000003771000000)

执行：
./a.out 
Connect to redisServer Success
Authentication success
Succeed to execute command[set stest1 value1]
The length of 'stest1' is 6.
Succeed to execute command[strlen stest1]
The value of 'stest1' is value1
Succeed to execute command[get stest1]
Succeed to execute command[get stest2]


参考：http://blog.csdn.net/mniwc/article/details/12851837


Generated by Jackxiang's Bo-blog 2.1.1 Release