Scanning map and removing specific building type.

[Rugarus]

• Unclaim base
  • Events
    • Player - Player 1 (Red) types a chat message containing -unclaim as An exact match
    • Player - Player 2 (Blue) types a chat message containing -unclaim as An exact match
    • Player - Player 3 (Teal) types a chat message containing -unclaim as An exact match
    • Player - Player 4 (Purple) types a chat message containing -unclaim as An exact match
    • Player - Player 5 (Yellow) types a chat message containing -unclaim as An exact match
    • Player - Player 6 (Orange) types a chat message containing -unclaim as An exact match
    • Player - Player 7 (Green) types a chat message containing -unclaim as An exact match
    • Player - Player 8 (Pink) types a chat message containing -unclaim as An exact match
    • Player - Player 9 (Gray) types a chat message containing -unclaim as An exact match
    • Player - Player 10 (Light Blue) types a chat message containing -unclaim as An exact match
  • Conditions
  • Actions
    • For each (Integer A) from 1 to 3, do (Actions)
      • Loop - Actions
        • If (All Conditions are True) then do (Then Actions) else do (Else Actions)
          • If - Conditions
            • Bases[(Integer A)] Equal to (Triggering player)
          • Then - Actions
            • -------- CHANGE 11 if more bases --------
            • Set Bases[(Integer A)] = Bases[11]
            • Set BasesInUse[(Integer A)] = False
            • Game - Display to (Player group((Triggering player))) the text: |cffffcc00Base 1 ha...
          • Else - Actions

In my game, a human places a flag like object down to claim the base. When he types -unclaim I have the base/region free up. But I also need to remove the flag object if it's found in the map. Only one flag is able to be made.

How can I in this trigger scan the map for a specific object, and remove it if it's ownership is the triggering player?

 

[Ceday]

I assume your flag object is actually a unit, since it has an ownership. Actions under "Unit Group" category is used for these "scanning" tasks. For your example:

• Unit Group - Pick every unit in (Units owned by (Triggering player) of type YOUR_FLAG) and do (Actions)
  • Loop - Actions
    • Unit - Remove (Picked unit) from the game

Picked unit refers to units that satisfy your search criteria.

 

[Wark]

Don't forget to also remove your unit groups to prevent leaks:

• Set TempGroup = (Units owned by (Triggering player) of type of type Flag)
• Unit Group - Pick every unit in TempGroup and do (Actions)
  • Loop - Actions
    • Unit - Remove (Picked unit) from the game
• Custom script: call DestroyGroup(udg_TempGroup)

 

[Rugarus]

Don't forget to also remove your unit groups to prevent leaks:

• Set TempGroup = (Units owned by (Triggering player) of type of type Flag)
• Unit Group - Pick every unit in TempGroup and do (Actions)
  • Loop - Actions
    • Unit - Remove (Picked unit) from the game
• Custom script: call DestroyGroup(udg_TempGroup)

What do leaks do? I briefly read about them months ago. Also why do I need to assign the unit group to a variable hen remove it?

 

[Tasyen]

What do leaks do?

Short:

Onto Leaks you have no access anymore, but they still exist, take up space in ram and calculating power.
That slowes down the performance, after a LOT of Leaks the match becomes quite uncomfortable to play.​

handling common Leaks.
technical detail.

Also why do I need to assign the unit group to a variable hen remove it?

That is one way, good one if you access one group multiple times.

other way is to set the autodestroy Flag (bj_wantDestroyGroup = true) provided by blizz, but sadly not setable without custom script.
The flag is reseted after each Group Function/Enumeration (to false).
This auto-destroy Flag works on most GUI Unit-Group-Actions.

• Custom script: set bj_wantDestroyGroup = true
• Unit Group - Pick every unit in (Playable Map Area) and do (Unit - Hide (Picked unit))