Forum Discussion

dan19's avatar
dan19
Binge Watcher
5 years ago
Solved

How to write an Array to Registry in BrightScript

Hello guys,

I am trying to write an array to a registry section. I don't know if this is possible, but it is neither reading back the value, nor throwing an error, so I thought to ask here.

Example of what I am trying to do:

someStates = ["Florida", "New York", "Texas"]

statesList = CreateObject("roRegistrySection", "statesList")
statesList.WriteMulti(someStates)
statesList.flush()
 
 
Roku Developer Program
  • necrotek's avatar
    necrotek
    5 years ago

    Maybe I did not add enough code in the explanation to support your example

     

    someStates = {state1:"Florida", state2:"New York", state3:"Texas"}
    data=FormatJson(someStates)
    ?data
    ?type(data)

    sec=CreateObject("roRegistrySection", "states")

    sec.Write("statelist", data)

    sec.Flush()

    if sec.Exists("statelist")

    statesFromRegistry=sec.Read("statelist")

     

    StatesList=ParseJson(statesFromRegistry)

    ?StatesList

    ?type(StatesList)

    end if 

8 Replies

  • renojim's avatar
    renojim
    Community Streaming Expert
    5 years ago

    Did you check the return value of WriteMulti?  If you had, you would see that it returns false.  It seems like it should throw an error since you're trying to save an array and you can only save an roAssociativeArray.

    Something like this would work, but I don't know about its usefulness:

    statesList = CreateObject("roRegistrySection", "statesList")
    someStates = {state1:"Florida", state2:"New York", state3:"Texas"}
?statesList.WriteMulti(someStates)
keysarray = ["state1","state2","state3"]
?statesList.ReadMulti(keysarray)

    What it's doing is saving a bunch of keys at once in the "statesList" registry section, so something like statesList.Read("state2") would return "New York".

    • dan19's avatar
      dan19
      Binge Watcher
      5 years ago

      Thanks for replying to my question. I tried the solution given, but it didn't seem to work. 

      Here's what I have done so far:

      m.movieArray.push(m.selectedMovie)

m.allMovies = {"movie": m.movieArray}
  
  movieList = CreateObject("roRegistrySection", "movieList")
  movieList.WriteMulti(m.allMovies)
  movieList.flush()
  keysArray = ["movie"]
  movieList.ReadMulti(keysArray)
  ? movieList.Read("movie")

      The idea for movieArray is to push all movies that someone has selected to save. I am new to Roku and this is just something I am practicing. There is no server to call or anything of such, and this is why I am using the registry to act as a DB.

      What am I doing wrong in the code? Thanks.

      renojim wrote:

      Did you check the return value of WriteMulti?  If you had, you would see that it returns false.  It seems like it should throw an error since you're trying to save an array and you can only save an roAssociativeArray.

      Something like this would work, but I don't know about its usefulness:

      statesList = CreateObject("roRegistrySection", "statesList")
      someStates = {state1:"Florida", state2:"New York", state3:"Texas"}
?statesList.WriteMulti(someStates)
keysarray = ["state1","state2","state3"]
?statesList.ReadMulti(keysarray)

      What it's doing is saving a bunch of keys at once in the "statesList" registry section, so something like statesList.Read("state2") would return "New York".

       

      • renojim's avatar
        renojim
        Community Streaming Expert
        5 years ago

        First of all, you're still not checking the return value of WriteMulti which is still false.

        I don't think there's any way to do what you're trying to do.  Keep in mind that the registry is nothing more than a a bunch of sections where each section has a set of keys with associated values - one value per key.  You're trying to save multiple values under the same key.  That's not possible.

        Also, be aware that the registry is a limited resource.  I don't know how many movies you're planning on saving, but I'd suggest having a "most recently used" approach where there's a limited number of movies that can be saved and when all slots are filled you overwrite the oldest.

        Because of its limitations, working with the registry can be a pain and you have to get clever.  I've used different approaches to save multiple values under one key like having fixed string lengths and concatenating multiple strings to save under one key, but in your case I'd just use one key for each movie, i.e., "movie1", "movie2", etc.