Given the section, I'll assume that you're using one of the "classic" Blitzes -- in these languages, the "easiest" way is usually to just write how many of an object there is to the save file before writing all of your objects. When loading the file, just read that many in.

Say your save/load functions for an individual object are something like this, and CountSpaceShips() tells you how many space ships are currently active.

[code]
; our space ship type
Type SpaceShip
   Field hp
   Field x#, y#
End Type

; This saves a spaceship to disk.
Function SaveSpaceShip(me.SpaceShip, file)
   ; save each field into the save file
   WriteInt file, hp
   WriteFloat file, x
   WriteFloat file, y
End Function

; save a space ship to a file on disk
Function LoadSpaceShip(file)
   ; create a ship
   Local me.SpaceShip = New SpaceShip

   ; read each field from the save file
   me\hp = ReadInt(file)
   me\x = ReadFloat(file)
   me\y = ReadFloat(file)
End Function

; It would probably be better to keep track of how
; many ships you have!
Function CountSpaceShips()
   Local count = 0, ship.SpaceShip
   For ship = Each SpaceShip
      count = count + 1
   Next
   Return count
End Function
[/code]

You can then do something like this to save:
[code]
; open the save file
Local file = WriteFile("game.sav"), ship.SpaceShip

; write how many spaceships there are
WriteFile file, CountSpaceShips()

For ship = Each SpaceShip
   SaveSpaceShip(ship, file)
Next

CloseFile file
[/code]

And read the save file like this:
[code]
Local file = ReadFile("game.sav")

; how many ships to load?
Local i, count = ReadInt(file)

; just load them in. It's easy now!
For i = 1 to count
   LoadSpaceShip(file)
Next
[/code]

You can follow the same basic principles for each type quite easily - save the count of players, then the players, save the count of enemies, then the enemies, etc.


This post is from -- http://socoder.net/index.php?topic=971