title: access redis hash with hiredis in C
body: <p>I have two hashes in the redis database with names "hash1" and "hash2". I created those hashes in another python file.
  Now i want to get all the keys and values that are in those hashes with hiredis in a .c file.
  Is that possible? I have only seen examples where you should now the name of the keys in order to take their values but i want to get all the keys and values according to the hash's name.Basically i want this command 
  <code>redis_cache.hgetall(HASH_NAME)</code>
  but with hiredis.</p>
  
  <p>Thank you</p>