CODEWITHSUNDEEP
unity-game-enginetransformscene
Siddharth
Siddharth

Reputation: 4312

MissingReferenceException at scene unload time

I want to store my data when current running scene was unloaded. For this purpose I have written following code:

void OnDisable ()
 {
     BackUpPuzzleData();
 }

 public void BackUpPuzzleData ()
 {
     if (DataStorage.RetrievePuzzleStatus (difficultyLevel, puzzleId) == Constants.PUZZLE_NOT_OPENED
         && DataStorage.RetrievePuzzleStatus (difficultyLevel, puzzleId) != Constants.PUZZLE_COMPLETED)
         DataStorage.StorePuzzleStatus (difficultyLevel, puzzleId, Constants.PUZZLE_RUNNING);

     if (DataStorage.RetrievePuzzleStatus (difficultyLevel, puzzleId) == Constants.PUZZLE_RUNNING)
         StorePuzzleData ();
 }


 private void StorePuzzleData ()
 {
     DataStorage.StorePuzzleTimePassed (difficultyLevel, puzzleId, GameController.gamePlayTime);

     foreach (Transform cell in gridTransform) {
         CellInformation cellInfo = cell.GetComponent<CellInformation> ();
         if (cellInfo != null) {
             CellStorage.StorePuzzleCellNumber (difficultyLevel, puzzleId, cellInfo.RowIndex, cellInfo.ColIndex, cellInfo.number);
             CellStorage.StorePuzzleCellColor (difficultyLevel, puzzleId, cellInfo.RowIndex, cellInfo.ColIndex, cellInfo.CellColor);
             CellStorage.StorePuzzleCellDisplayColor (difficultyLevel, puzzleId, cellInfo.RowIndex, cellInfo.ColIndex, cellInfo.CellDisplayColor);
         }
     }
 }

But when OnDisable method gets called at that time Console giving me following error:

enter image description here

I have already set execution order of scrip in project settings then why I am getting this kind of error?

GOAL: Basically I want to save current game play data so when game player return back he can again start from which he left game.

Upvotes: 0

Views: 89

Answers (2)

Siddharth
Siddharth

Reputation: 4312

Passing some time with this problem, now I can able to figure out this problem. I don't know how much solution was correct but at least now working for me.

Here I am discussing this because some members get some hint from this.

At game load time, I filled up one list with all cell's script. Each cell of grid has one script attached CellInformation. So I prepare list of all these cells script.

At game disable time, I fetched value from these scripts and store into local storage. I can able to access scripts but not game objects from list because they were already destroyed.

void OnDisable ()
{
    StorePuzzleData ();
}

private void StorePuzzleData ()
{
    DataStorage.StorePuzzleTimePassed (difficultyLevel, puzzleId, GameController.gamePlayTime);

    foreach (CellInformation cellInfo in cellInfoList) {
        CellStorage.StorePuzzleCellNumber (difficultyLevel, puzzleId, cellInfo.RowIndex, cellInfo.ColIndex, cellInfo.number);
        CellStorage.StorePuzzleCellColor (difficultyLevel, puzzleId, cellInfo.RowIndex, cellInfo.ColIndex, cellInfo.CellColor);
        CellStorage.StorePuzzleCellDisplayColor (difficultyLevel, puzzleId, cellInfo.RowIndex, cellInfo.ColIndex, cellInfo.CellDisplayColor);
        CellStorage.StorePuzzleCellGroupComplete (difficultyLevel, puzzleId, cellInfo.RowIndex, cellInfo.ColIndex, cellInfo.IsGroupComplete ? 1 : 0);
    }

}

I hope this will give some hints to other programmers.

Upvotes: 0

MalachiteBR
MalachiteBR

Reputation: 571

I have a suggestion, instead of saving when scene unload you could save everytime the player makes a move, this way even if the game crashes you can recover from the last time the player made a move.

This scene unloading, will occur automatically or will the user make any action (like clicking a button)? If it is a player event, you should put your save code on that button, because, as far as I could research, the OnDisable behaviour will be called after your objects gets destroyed, making it impossible for you to store their data.

Upvotes: 1

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