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C Connection Example

Last updated: 2021-11-30 16:24:26

Preparations before running:

Doawnload and install hiredis.

Sample Code:

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <hiredis.h>
int main(int argc, char **argv) {
  unsigned int j;
  redisContext *c;
  redisReply *reply;
if (argc < 4) {
    printf("Usage: 192.xx.xx.195 6379 instance_id password\n");
    exit(0);
  }
  const char *hostname = argv[1];
  const int port = atoi(argv[2]);
  const char *instance_id = argv[3];
  const char *password    = argv[4];

  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);
  }
    /* AUTH */
  reply = redisCommand(c, "AUTH %s", password);
  printf("AUTH: %s\n", reply->str);
  freeReplyObject(reply);
   /* PING server */
  reply = redisCommand(c,"PING");
  printf("PING: %s\n", reply->str);
  freeReplyObject(reply);
   /* Set a key */
  reply = redisCommand(c,"SET %s %s", "name", "credis_test");
  printf("SET: %s\n", reply->str);
  freeReplyObject(reply);
   /* Try a GET  */
  reply = redisCommand(c,"GET name");
  printf("GET name: %s\n", reply->str);
  freeReplyObject(reply);
   /* Disconnects and frees the context */
  redisFree(c);
   return 0;
}

Execution results:

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