1. 安装hiredis，下载链接https://github.com/redis/hiredis
这时redis自带的官方的C语言API。Linux安装很简单：
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# 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;
}
