Redis C + + Programming example

Basic function steps:

1, download and install redis,:http://www.redis.cn/download.html.

2, download and install Hiredis,:https://github.com/redis/hiredis.

Place the libhiredis.so in the/usr/lib/directory.

3, write the client program under the Hiredis-master directory.

[CPP]View PlainCopy

2. #include <stdio.h>
4. #include "Hiredis.h"
8. int main ()
10. {
12. Rediscontext *conn = Redisconnect ("127.0.0.1", 6379);
14. if (conn! = NULL && conn->err)
16. {
18. printf ("Connection error:%s\n", CONN->ERRSTR);
20. return 0;
22. }
24. Redisreply *reply = (redisreply*) rediscommand (conn,"set foo 1234");
26. Freereplyobject (reply);
30. Reply = Rediscommand (conn,"get foo");
32. printf ("%s\n", reply->str);
34. Freereplyobject (reply);
38. Redisfree (conn);
40. return 0;
42. }

Compile command: Gcc-o redistest Redistest.c-lhiredis

4. Start the server and run the client program.

Redis pub/sub feature implementation.

Publish pub Feature:

[CPP]View PlainCopy

2. #include <stdio.h>
4. #include <sys/time.h>
6. #include "Hiredis.h"
10. int main ()
12. {
14. struct timeval begin;
18. Rediscontext *conn = Redisconnect ("127.0.0.1", 6379);
20. if (conn! = NULL && conn->err)
22. {
24. printf ("Connection error:%s\n", CONN->ERRSTR);
26. return 0;
28. }
32. Gettimeofday (&begin, NULL);
34. Redisreply *reply = (redisreply*) rediscommand (conn,"publish foo 1234");
38. int sec, usec;
40. SEC = begin.tv_sec;
42. USEC = begin.tv_usec;
46. printf ("%d\t%d\n", sec, USEC);
50. Freereplyobject (reply);
54. Reply = Rediscommand (conn,"get foo");
56. printf ("%s\n", reply->str);
58. Freereplyobject (reply);
62. Redisfree (conn);
64. return 0;
66. }

Subscribe to Sub Features:

[CPP]View PlainCopy

2. #include <sys/time.h>
4. #include <stdio.h>
6. #include <stdlib.h>
8. #include <string.h>
10. #include <signal.h>
12. #include "Hiredis.h"
14. #include "async.h"
16. #include "Adapters/libevent.h"
20. void Subcallback (Redisasynccontext *c, void *r, void *priv) {
22. struct Timeval end;
24. int sec, usec;
28. Redisreply *reply = r;
30. if (reply = = NULL) return;
32. if (Reply->type = = Redis_reply_array && reply->elements = = 3) {
34. if (strcmp (REPLY->ELEMENT[0]->STR, "subscribe")! = 0) {
38. Gettimeofday (&end,null);
42. SEC = end.tv_sec;
44. USEC = end.tv_usec;
46. printf ("%d\t%d\n", sec, USEC);
50. printf ( "received[%s] Channel%s:%s\n",
52. (char*) Priv,
54. REPLY->ELEMENT[1]->STR,
56. REPLY->ELEMENT[2]->STR);
58. }
60. }
62. }
66. void Connectcallback (const redisasynccontext *c, int status) {
68. if (Status! = REDIS_OK) {
70. printf ("Error:%s\n", C->ERRSTR);
72. return;
74. }
76. printf ("connected...\n");
78. }
82. void Disconnectcallback (const redisasynccontext *c, int status) {
84. if (Status! = REDIS_OK) {
86. printf ("Error:%s\n", C->ERRSTR);
88. return;
90. }
92. printf ("disconnected...\n");
94. }
98. int main (int argc, char **argv) {
100. Signal (Sigpipe, sig_ign);
102. struct Event_base *base = event_base_new ();
106. Redisasynccontext *c = Redisasyncconnect ("127.0.0.1", 6379);
108. if (c->err) {
110. / * Let *c leak to now ... * /
112. printf ("Error:%s\n", C->ERRSTR);
114. return 1;
116. }
120. Redislibeventattach (c,base);
122. Redisasyncsetconnectcallback (C,connectcallback);
124. Redisasyncsetdisconnectcallback (C,disconnectcallback);
126. Redisasynccommand (c, Subcallback, (char*) "Sub", "SUBSCRIBE foo");
130. Event_base_dispatch (base);
132. return 0;
134. }

Pub compile command ibid., Sub Compile command: Gcc-o Sub sub.c-lhiredis-levent

Attention:

1, you may need to build a link when compiling the Basic program: Ln-s libhiredis.so libhiredis.so.0.12

2, 1, subscription sub requires installation of Libevent-dev.

Redis C + + Programming example