UnitHasItem(GetTriggerUnit(), тип предмета 'I01V' )

native          CreateItem      takes integer itemid, real x, real y returns item

function UnitHasItemOfTypeBJ takes unit whichUnit, integer itemId returns boolean
    return GetInventoryIndexOfItemTypeBJ(whichUnit, itemId) > 0
endfunction

function UnitHasItemWithId takes unit whichUnit, integer itemId returns boolean
	local integer index=0
	loop
		exitwhen index>5
		if GetItemTypeId(UnitItemInSlot(whichUnit,index))==itemId then
			return true
		endif
		index=index+1
	endloop
endfunction

function UnitTakeItemOfType takes unit whichUnit, integer itemId returns item
local integer i
local item it
loop
      set it=UnitItemInSlot(whichUnit,index)    
      if itemId==GetItemTypeId(it) then
              return it
      endif
      set i=i+1
      exitwhen i==6
endloop
return null
endfunction

function UnitTakeItemOfType takes unit whichUnit, integer itemId returns item
local integer i=UnitInventorySize(whichUnit)-1
loop
      if itemId==GetItemTypeId(UnitItemInSlot(whichUnit,i)) then
              return UnitItemInSlot(whichUnit,i)
      endif
      exitwhen i==0
      set i=i-1
endloop
return null
endfunction

// возвращает true если итем типа it есть у юнита u
function IsItemInInventory takes unit u, integer it returns boolean
  local integer i = 0
  loop
    exitwhen GetItemTypeId(UnitItemInSlot(u, i)) == it or (i > 5)
    set i = i + 1
  endloop
  return i < 6
endfunction

// такой вариант тоже катит:
function IsItemInInventory takes unit u, integer it returns boolean
  return (GetItemTypeId(UnitItemInSlot(u, 0)) == it) or (GetItemTypeId(UnitItemInSlot(u, 1)) == it) or (GetItemTypeId(UnitItemInSlot(u, 2)) == it) or (GetItemTypeId(UnitItemInSlot(u, 3)) == it) or (GetItemTypeId(UnitItemInSlot(u, 4)) == it) or (GetItemTypeId(UnitItemInSlot(u, 5)) == it)
endfunction

// получение предмета из инвентаря по id
function GetItemInInventory takes unit u, integer it returns item
  local integer i = 0
  loop
    exitwhen GetItemTypeId(UnitItemInSlot(u, i)) == it or (i > 5)
    set i = i + 1
  endloop
  if i < 6 then
    return UnitItemInSlot(u, i)
  endif
  return null
endfunction