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Save and Load game data

Save and Load game data

Postby SpiderMack » 25 Sep 2017, 22:36

Hi,

I didn't find any Skyline examples about this important game feature, saving and loading game checkpoints or game data.

Is there some Api to load and save to a file game data ? I didn't find any class in Lua ?

Or must we use Lua - File I/O ?
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Re: Save and Load game data

Postby Shando » 25 Sep 2017, 23:08

Hi Buddy,

There is a JSON api (http://www.chi-ad.com/Skyline/API/Lua/html/classjson.html) that works really well and is pretty easy to use as it works on Lua Tables:

Code: Select all
obj = 0

function onInit ( objID )
   obj = objID
end

function onKeyDown ( key )
   -- | on key one, serialize the table to aJSON file.
   if ( key == "1" ) then
      sky.lprint ( "#&127,127,127:Saving table to JSON..." )
   
      -- | Create a lua table and fill in some data to test with.
      local tempTable = { }
      tempTable["playername"] = "Joe"
      tempTable["lastName"] = "Bloggs"
      tempTable[0] = { ["a"]="Hello", [3]=200}
      tempTable[1] = "World"
     
      -- | Next, create a json object based on the table, this contains the correct
      -- | metatable for the code to write the JSON data properly.
      jsonObj = rapidjson.object ( tempTable )
     
      -- | Finally, dump the new object into a json file.
      -- |    > The "pretty" at the end is to create more readable lines. Setting false will write into one line.
      -- |    > For a specific location on a Hard drive e.g. E:/myFile.json
      -- |    > You can name the extension to whatever you want ... *.tableData, *.player etc...
      rapidjson.dump ( jsonObj, "myfile.json", {pretty=true} )
     
      sky.lprint ( "#&127,255,127:Saving table to JSON Complete!" )
   end
   
   -- | on key two, load the json data into a table and print it.
   if ( key == "2" )then
      sky.lprint ( "#&127,127,127:Loading table from JSON..." )
   
      -- | Load the json file back into a table.
      testTable = rapidjson.load ( "E:/myfile.json" )
     
      -- | Print the data.
      sky.lprint ( "playername = " .. testTable["playername"] )
      sky.lprint ( "lastName = " .. testTable["lastName"] )
      sky.lprint ( "0 = " .. testTable[tostring ( 0 )]["a"] )
      sky.lprint ( "0 = " .. testTable[tostring ( 0 )][tostring ( 3 )] )
      sky.lprint ( "1 =  ".. testTable[tostring ( 1 )] )
     
      sky.lprint ( "#&127,255,127:Loading table from JSON Complete!" )
   end
end


HTH

Shando
Alienware 17 (i7-4700MQ 2.4GHz 16GB GTX770M Win 10 64)

Love, Hope, Strength http://www.lovehopestrength.co.uk
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Re: Save and Load game data

Postby SpiderMack » 25 Sep 2017, 23:19

Nice :)
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Re: Save and Load game data

Postby SolarPortal » 26 Sep 2017, 09:58

Thanks for sharing that @Shando :)

@Spidermack, JSON is extremely quick to read and write, and we also are in the process of building a basic encryption for files to protect save files and the like :)
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