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Spring.CreateUnit()
Posted: 24 Jan 2010, 04:05
by Voidranaut
I have been playing with the Spring.CreateUnit() command in the following script
Code: Select all
function gadget:GetInfo()
return {
name = "CUTests",
desc = "creates units",
author = "zwzsg (and then horribly ruined by Voidranaut)",
date = "not sure",
version = "1.0",
license = "Public Domain",
layer = 0,
enabled = true
}
end
local message_identifier = gadget:GetInfo().name..": "
local once = 1
if (gadgetHandler:IsSyncedCode()) then--SYNCED
function gadget:RecvLuaMsg(msg,player)
local MsgForMe=string.match(msg,message_identifier.."(.*)")
if MsgForMe then
Spring.Echo("Synced recieved a message from unsynced:")
Spring.Echo(MsgForMe)
if( once == 1) then
Spring.CreateUnit( 367, 7110, 2700, 38,(0), 1, 0 )
once = 0
end
end
end
else--UNSYNCED
function gadget:KeyPress(key) --key scope exists within the function
if( key == 121 ) then
for _,u in ipairs(Spring.GetAllUnits()) do
Spring.SendLuaRulesMsg(message_identifier..u.." was pressed")
Spring.Echo( u )
end
end
Spring.Echo("Key "..key.." pressed in unsynced")
Spring.SendLuaRulesMsg(message_identifier..key.." was pressed")
end
end
the locations dictated by the x,y,z position in the Spring.CreateUnit() is just an area on the map that my first unit spawns near (I got the cowardinates from just holding my cursor over a blank peice of land)
when I hit the key to trigger the event I get this error
Code: Select all
Key 121 pressed in unsynced
[ 833] Synced recieved a message from unsynced:
[ 833] 6344 was pressed
[ 833] LuaRules::RunCallIn: error = 2, RecvLuaMsg, [string "LuaRules/Gadgets/cutests.lua"]:29: Unsafe attempt to change game state
[ 833] Synced recieved a message from unsynced:
[ 833] 2738 was pressed
[ 833] LuaRules::RunCallIn: error = 2, RecvLuaMsg, [string "LuaRules/Gadgets/cutests.lua"]:29: Unsafe attempt to change game state
[ 833] Synced recieved a message from unsynced:
[ 833] 1096 was pressed
[ 833] LuaRules::RunCallIn: error = 2, RecvLuaMsg, [string "LuaRules/Gadgets/cutests.lua"]:29: Unsafe attempt to change game state
[ 833] Synced recieved a message from unsynced:
[ 833] 121 was pressed
[ 833] LuaRules::RunCallIn: error = 2, RecvLuaMsg, [string "LuaRules/Gadgets/cutests.lua"]:29: Unsafe attempt to change game state
now there is alot of this error that is undoubtibly because I badly wrote the scirpt BUT my BIGGEST question does come from this part here
Code: Select all
Unsafe attempt to change game state
question: what exactly are the needed requirements for a unit to be "safely" spawned?
(loard know I did 100 things wrong on this scirpt but that is my main quesiton)
Re: Spring.CreateUnit()
Posted: 24 Jan 2010, 04:12
by FLOZi
You can use
Code: Select all
AllowUnsafeChanges("USE AT YOUR OWN PERIL")
-- Allows the use of the following call-outs when
-- not in the GameFrame() or GotChatMsg() call-ins:
--
-- CreateUnit()
-- DestroyUnit()
-- TransferUnit()
-- CreateFeature()
-- DestroyFeature()
-- TransferFeature()
-- GiveOrderToUnit()
-- GiveOrderToUnitMap()
-- GiveOrderToUnitArray()
-- GiveOrderArrayToUnitMap()
-- GiveOrderArrayToUnitArray()
--
-- *** The string argument must be an exact match ***
S44, CA and others use it without any negative impact afaik.
Re: Spring.CreateUnit()
Posted: 24 Jan 2010, 04:40
by zwzsg
Though, it would be more safe to create units in GameFrame!
Or are you saying the safety is useless?
Re: Spring.CreateUnit()
Posted: 24 Jan 2010, 04:43
by Voidranaut
zwzsg wrote:Though, it would be more safe to create units in GameFrame!
Or are you saying the safety is useless?
I see I did not realize that the game frame was the missing componet
I will look into that now
thanks for pointing me in the right direction :)
and thanks for letting me know about the possiblity of Allowing unsafe changes :)
Re: Spring.CreateUnit()
Posted: 24 Jan 2010, 05:23
by FLOZi
zwzsg wrote:Though, it would be more safe to create units in GameFrame!
Or are you saying the safety is useless?
Quantum assured me that trepan explained to him excellent reasons why such things are unsafe. Empirically, however, I've not seen any problems caused by it in S44. And afaik CA still uses it, as do all of Argh's projects that I know of.
Also, seen as lua unit scripts (LUS) are in gadgetland, I assume that without it you couldn't use CreateUnit in LUS, which can be a useful thing to be able to do.
Re: Spring.CreateUnit()
Posted: 24 Jan 2010, 09:50
by Tobi
FLOZi wrote:Also, seen as lua unit scripts (LUS) are in gadgetland, I assume that without it you couldn't use CreateUnit in LUS, which can be a useful thing to be able to do.
You could still put them in a list in GG and create them in GameFrame in a special gadget for this...
And yes, AllowUnsafeChanges allows you to crash Spring in quite nasty ways, but also yes, accidentally doing that doesn't happen too often.
Re: Spring.CreateUnit()
Posted: 24 Jan 2010, 15:37
by FLOZi
Tobi wrote:FLOZi wrote:Also, seen as lua unit scripts (LUS) are in gadgetland, I assume that without it you couldn't use CreateUnit in LUS, which can be a useful thing to be able to do.
You could still put them in a list in GG and create them in GameFrame in a special gadget for this...
Yeah but, considerably more hassle and harder to read than just having CreateUnit() right there in your code.
And yes, AllowUnsafeChanges allows you to crash Spring in quite nasty ways, but also yes, accidentally doing that doesn't happen too often.
Now I'm intrigued.
Re: Spring.CreateUnit()
Posted: 25 Jan 2010, 01:13
by Voidranaut
with this spring creat unit stuff I was hopeing to make a gadget that would make a specific unit on a specific part of the map when I hit a key on the key board
so far my code looks like this
Code: Select all
function gadget:GetInfo()
return {
name = "CUTests",
desc = "creates units",
author = "zwzsg (and then horribly ruined by Voidranaut)",
date = "not sure",
version = "1.0",
license = "Public Domain",
layer = 0,
enabled = true
}
end
local message_identifier = gadget:GetInfo().name..": "
local once = 1
if (gadgetHandler:IsSyncedCode()) then--SYNCED
function gadget:RecvLuaMsg(msg,player)
local MsgForMe=string.match(msg,message_identifier.."(.*)")
if MsgForMe then
Spring.Echo("Synced recieved a message from unsynced:")
Spring.Echo(MsgForMe)
end
end
function gadget:GameFrame(n)
function gadget:RecvLuaMsg(msg,player)
local MsgForMe=string.match(msg,message_identifier.."(.*)")
if MsgForMe then
if( once == 1) then
Spring.CreateUnit( 367, 7110, 2700, 38,(0), 1, 0 )
once = 0
end
Spring.Echo("Synced recieved a message from unsynced:")
Spring.Echo(MsgForMe)
end
end
end
else--UNSYNCED
function gadget:KeyPress(key) --key scope exists within the function
if( key == 121 ) then
for _,u in ipairs(Spring.GetAllUnits()) do
Spring.SendLuaRulesMsg(message_identifier..u.." was pressed")
Spring.Echo( u )
end
end
Spring.Echo("Key "..key.." pressed in unsynced")
Spring.SendLuaRulesMsg(message_identifier..key.." was pressed")
end
end
now as you can see I dont know at all how to work with fuction gadget:GameFrame()... I LITERALY just stuck my command in it and hoped it would not crash... the nice thing is it did not :) YAYA small victory!!.. but of course it did nto work and gave me the following error
Code: Select all
LuaRules::RunCallIn: error = 2, RecvLuaMsg, [string "LuaRules/Gadgets/cutests.lua"]:44: Unsafe attempt to change game state
Probleam: now I know I dont know anything about game frame but I am also haveing ALOT of trouble finding more info on it (all I know is it is called every game frame in synced code)
Question: is there any good sources of info on GameFrame() that anyone can point me to? and esspecially how exactly it is envolved in the act of Spring.CreateUnit()
EDIT!: sorry one last question
question: is gameframe needed to change resources? or command buttons to unit menues?