A)编译安装
make
make install (/usr/local)
make install PREFIX=$HOME/progs(可以自由指定安装路径)
B)同步的API接口
redisContext *redisConnect(const char *ip, int port);
void *redisCommand(redisContext *c, const char *format, ...);
void freeReplyObject(void *reply);
1)建立连接
redisContext *c = redisConnect("127.0.0.1", 6379);
if (c != NULL && c->err) {
printf("Error: %s\n", c->errstr);
// handle error
}
redisConnect函数用来创建一个叫redisContext的东西，它包含了连接相关的信息，它里面有个err字段，0表示正常，其他表示出错了！通过errstr字段可以知晓错误信息。
2)执行命令
reply = redisCommand(context, "SET key value");
reply = redisCommand(context, "SET key %s", value);
reply = redisCommand(context, "SET key %b", value, (size_t) valuelen);
reply = redisCommand(context, "SET key:%s %s", myid, value);
redisCommand的调用格式类似printf函数，上面的第二条调用语句的作用在于输入二进制格式的value内容，其后必须表明二进制的字节长度!
3)redisCommand函数返回一个东西叫redisReply，我们需要通过判断它的type字段来知道返回了具体什么样的内容：
REDIS_REPLY_STATUS 表示状态，内容通过str字段查看，字符串长度是len字段
REDIS_REPLY_ERROR 表示出错，查看出错信息，如上的str,len字段
REDIS_REPLY_INTEGER 返回整数，从integer字段获取值
REDIS_REPLY_NIL 没有数据返回
REDIS_REPLY_STRING 返回字符串，查看str,len字段
REDIS_REPLY_ARRAY 返回一个数组，查看elements的值（数组个数），通过element[index]的方式访问数组元素，每个数组元素是 一个redisReply对象的指针
4)另外有一个类似的函数，批量执行命令：
void *redisCommandArgv(redisContext *c, int argc, const char **argv, const size_t *argvlen);
5)redisReply使用完毕后，需要使用函数freeReplyObject进行释放销毁
void redisFree(redisContext *c)的作用是断开连接，并释放redisContext的内容
6)redisCommand的函数执行流程说明：
a.格式化redis command
b.格式化后的命令内容放入redisContext的输出缓冲区
c.调用redisGetReply函数执行命令，得到结果
7)管道的使用方式：
a.填入需要执行的命令
void redisAppendCommand(redisContext *c, const char *format, ...);
void redisAppendCommandArgv(redisContext *c, int argc, const char **argv, const size_t *argvlen);
b.获取命令的输出结果
int redisGetReply(redisContext *c, void **reply);
c.释放输出结果
void freeReplyObject(void *reply);
例子:
redisReply *reply = NULL;
redisAppendCommand(context,"set key1 value");
redisAppendCommand(context,"get key2");
redisGetReply(context,&reply); // reply for set
freeReplyObject(reply);
redisGetReply(context,&reply); // reply for get
freeReplyObject(reply);
订阅模式：
reply = redisCommand(context,"SUBSCRIBE test");
freeReplyObject(reply);
while(redisGetReply(context,&reply) == REDIS_OK) {
// consume message
freeReplyObject(reply);
}
8)redisReply返回结果处理：
REDIS_OK 正常
REDIS_ERR_IO IO读/写出现异常，通过errno查看原因
REDIS_ERR_EOF 服务器关闭了链接，读结束
REDIS_ERR_PROTOCOL 分析redis协议内容出错
EDIS_ERR_OTHER 其他未知的错误
上述错误类型都可以通过redisReply的errstr字段查看简短的描述
C)异步API(异步API的使用方式和同步API差不多，在这儿列出不同的函数吧)
1.连接redis服务器
redisAsyncContext *c = redisAsyncConnect("127.0.0.1", 6379);
if (c->err) {
printf("Error: %s\n", c->errstr);
// handle error
}
2.设置连接、断开的钩子函数
int redisAsyncSetConnectCallback(redisAsyncContext *ac, redisConnectCallback *fn);
int redisAsyncSetDisconnectCallback(redisAsyncContext *ac, redisDisconnectCallback *fn);
3.插入命令信息
int redisAsyncCommand(redisAsyncContext *ac, redisCallbackFn *fn, void *privdata,const char *format, ...);
int redisAsyncCommandArgv( redisAsyncContext *ac, redisCallbackFn *fn, void *privdata, int argc, const char **argv, const size_t *argvlen);
获取命令输出和同步API相同
4.关闭连接
void redisAsyncDisconnect(redisAsyncContext *ac);
D)辅助API
下面的API主要用于其他编程语言绑定的术后，可以读取分析数据
redisReader *redisReaderCreate(void);
void redisReaderFree(redisReader *reader);
int redisReaderFeed(redisReader *reader, const char *buf, size_t len);
int redisReaderGetReply(redisReader *reader, void **reply);
官方例子：
1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4
5 #include <hiredis.h>
6
7 int main(int argc, char **argv) {
8 unsigned int j;
9 redisContext *c;
10 redisReply *reply;
11 const char *hostname = (argc > 1) ? argv[1] : "127.0.0.1";
12 int port = (argc > 2) ? atoi(argv[2]) : 6379;
13
14 struct timeval timeout = { 1, 500000 }; // 1.5 seconds
15 c = redisConnectWithTimeout(hostname, port, timeout);
16 if (c == NULL || c->err) {
17 if (c) {
18 printf("Connection error: %s\n", c->errstr);
19 redisFree(c);
20 } else {
21 printf("Connection error: can't allocate redis context\n");
22 }
23 exit(1);
24 }
25
26 /* PING server */
27 reply = redisCommand(c,"PING");
28 printf("PING: %s\n", reply->str);
29 freeReplyObject(reply);
30
31 /* Set a key */
32 reply = redisCommand(c,"SET %s %s", "foo", "hello world");
33 printf("SET: %s\n", reply->str);
34 freeReplyObject(reply);
35
36 /* Set a key using binary safe API */
37 reply = redisCommand(c,"SET %b %b", "bar", (size_t) 3, "hello", (size_t) 5);
38 printf("SET (binary API): %s\n", reply->str);
39 freeReplyObject(reply);
40
41 /* Try a GET and two INCR */
42 reply = redisCommand(c,"GET foo");
43 printf("GET foo: %s\n", reply->str);
44 freeReplyObject(reply);
45
46 reply = redisCommand(c,"INCR counter");
47 printf("INCR counter: %lld\n", reply->integer);
48 freeReplyObject(reply);
49 /* again ... */
50 reply = redisCommand(c,"INCR counter");
51 printf("INCR counter: %lld\n", reply->integer);
52 freeReplyObject(reply);
53
54 /* Create a list of numbers, from 0 to 9 */
55 reply = redisCommand(c,"DEL mylist");
56 freeReplyObject(reply);
57 for (j = 0; j < 10; j++) {
58 char buf[64];
59
60 snprintf(buf,64,"%d",j);
61 reply = redisCommand(c,"LPUSH mylist element-%s", buf);
62 freeReplyObject(reply);
63 }
64
65 /* Let's check what we have inside the list */
66 reply = redisCommand(c,"LRANGE mylist 0 -1");
67 if (reply->type == REDIS_REPLY_ARRAY) {
68 for (j = 0; j < reply->elements; j++) {
69 printf("%u) %s\n", j, reply->element[j]->str);
70 }
71 }
72 freeReplyObject(reply);
73
74 /* Disconnects and frees the context */
75 redisFree(c);
76
77 return 0;
78 }
整理自：http://www.mamicode.com/info-detail-501902.html
FROM: http://www.cnblogs.com/houjun/p/4875116.html
