我们可以通过hireddis将C int数组设置为Redis中的键值吗？

Question

给定：int x [3] = {11,22,33}; 如何将其作为键值保存为二进制数据并获取

hiredis提供了有关如何设置二进制安全字符串的示例

   /* 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);

但是其他数据又如何获取呢？

Answer 1

将二进制数据直接存储在远程存储中而不进行任何编组处理是灾难的根源。我不建议这样做：可以使用许多序列化协议来使二进制数据独立于平台。

也就是说，回答您的问题：

// This is the key
int k[3] = {11,22,33};

// This is the value
int v[4] = {0,1,2,3};
redisReply *reply = 0;

// Store the key/value: note the usage of sizeof to get the size of the arrays (in bytes)
reply = redisCommand(context, "SET %b %b", k, (size_t) sizeof(k), v, (size_t) sizeof(v) );
if (!reply)
    return REDIS_ERR;
freeReplyObject(reply);

// Now, get the value back, corresponding to the same key
reply = redisCommand(context, "GET %b", k, (size_t) sizeof(k) );
if ( !reply )
    return REDIS_ERR;
if ( reply->type != REDIS_REPLY_STRING ) {
    printf("ERROR: %s", reply->str);
} else {

    // Here, it is safer to make a copy to be sure memory is properly aligned
    int *val = (int *) malloc( reply->len );
    memcpy( val, reply->str, reply->len);
    for (int i=0; i<reply->len/sizeof(int); ++i )
        printf("%d\n",val[i]);
    free( val );
}
freeReplyObject(reply);

请注意，只有在确保所有Redis客户端在具有相同字节序和相同sizeof（int）的系统上运行时，此类代码才有效。