Cookbook: UDK simple data save/load from disk

Have you ever wondered how to store simple data (save game) somewhere on the disk with UDK?

Simplest way that I discovered is usage of existing config system API. Let's present its usage on simple temporary leaderboard system that I use:

• create a new config file (for example MyLevelLeaderboard.ini)
• create script file that specifies its content

   1:  Class LevelLeaderboard extends Object

   2:      PerObjectConfig

   3:      Config(MyLevelLeaderboard);

   4:   

   5:  var config float bestTime; //specify variables

   6:  var config int bestScore;

   7:  var config int bestSteps;

• access and edit data via script

   1:  local LevelLeaderboard LL;

   2:      

   3:  //load old bests (for current level), creates file if not existing

   4:  //second parameter specifies subsection name in ini file

   5:  LL = new(None,WorldInfo.GetMapName(false)) class'LevelLeaderboard';

   6:      

   7:  //update values

   8:  LL.bestTime = FMin(totalTime,LL.bestTime);

   9:  LL.bestScore = FMax(totalScore,LL.bestScore);

  10:  LL.bestSteps = FMin(totalSteps,LL.bestSteps);

  11:  LL.SaveConfig();  //save changes

• resulting  MyLevelLeaderboard.ini file looks like this

   1:  [testlevel1 LevelLeaderboard]

   2:  bestTime=73.390839

   3:  bestScore=4600

   4:  bestSteps=218

   5:   

   6:  [testlevelpuzzles LevelLeaderboard]

   7:  bestTime=2.615733

   8:  bestScore=100

   9:  bestSteps=3

  10:   

  11:  [simplelevel LevelLeaderboard]

  12:  bestTime=95.921692

  13:  bestScore=6700

  14:  bestSteps=336