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attempt to call a nil value cheat engine

 
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dedlyblady
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Joined: 14 Sep 2017
Posts: 31

PostPosted: Wed Dec 13, 2017 11:18 am    Post subject: attempt to call a nil value cheat engine Reply with quote

Hi Guyes ... can anyone tell me how fix ches problem please ?
attempt to call a nil value cheat engine
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FreeER
Grandmaster Cheater
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Joined: 09 Aug 2013
Posts: 710

PostPosted: Wed Dec 13, 2017 2:54 pm    Post subject: Reply with quote

find where you're trying to call a function that doesn't exist (is "nil"), line numbers can often help you, at that point you can use print(tostring(...)) for any function/variable you're trying to use (copy + paste) to make sure you haven't mistyped it or verify that it was properly set.
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dedlyblady
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Joined: 14 Sep 2017
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PostPosted: Wed Dec 13, 2017 8:10 pm    Post subject: Reply with quote

FreeER wrote:
find where you're trying to call a function that doesn't exist (is "nil"), line numbers can often help you, at that point you can use print(tostring(...)) for any function/variable you're trying to use (copy + paste) to make sure you haven't mistyped it or verify that it was properly set.


thanks for replay ... u can uplaod u my Script see this problems and fixed it because i dont have enogh Experience For this .. Rolling Eyes
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FreeER
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Posts: 710

PostPosted: Thu Dec 14, 2017 10:44 am    Post subject: Reply with quote

If you can write the script you should be able to go to the given line number and add "print(tostring(some variable name))" before it... but sure you can share the script here and maybe I'll be able to figure it out without having to run the script (because if I do have to run the script then the likelihood of me having the game to test with is pretty low).
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tolo
How do I cheat?
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Joined: 15 Dec 2017
Posts: 2

PostPosted: Tue Dec 19, 2017 6:15 am    Post subject: Reply with quote

this is my script and i always get the error:

Error:[string "ByX = readFloat('[[[[["game..."]:21: attempt to perform arithmetic on a nil value

Code:

ByX = readFloat('[[[[["game.exe"+0016C451C]+444]+2c]+108]+4]+30')
ByY = readFloat('[[[[["game.exe"+0016C451C]+444]+2c]+108]+4]+38')
ByZ = readFloat('[[[[["game.exe"+0016C451C]+444]+2c]+108]+4]+34')
botX = readFloat('[[[[["game.exe"+01691940]+DC]+0]+1C]+110]+64')
botY = readFloat('[[[[["game.exe"+01691940]+DC]+0]+1C]+110]+6C')
botZ = readFloat('[[[[["game.exe"+01691940]+DC]+0]+1C]+110]+68')
Cam_X = readFloat('[[[[["game.exe"+016C0E24]+464]+4]+EC]+4]+44')
Cam_Y = readFloat('[[[["game.exe"+016C44EC]+74]+f8]+1C]+4f4')

print (ByX)
print (ByY)
print (ByZ)
print (botX)
print (botY)
print (botZ)
print (Cam_X)
print (Cam_Y)

function sight_angle()

         calcX=readFloat(ByX)-readFloat(botX)
         calcY=readFloat(ByY)-readFloat(botY)
         calcZ=readFloat(ByZ)-readFloat(botZ)+5

         distance=math.sqrt(math.pow(calcX, 2)+math.pow(calcY, 2))

         angleX=math.deg(math.atan2(calcX, calcY))+180
         angleY=math.deg(math.atan2(calcZ, distance))


         if (isKeyPressed(VK_V)) then
          writeFloat(Cam_X, angleX)
          writeFloat(Cam_Y, angleY)
         end
end


t=createTimer(1)
timer_setInterval(t, 10000)
timer_onTimer(t, sight_angle)




the float values get printed in the lua Output like in cheat engine but the calculation of the function doesn't work, why!?
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FreeER
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Joined: 09 Aug 2013
Posts: 710

PostPosted: Tue Dec 19, 2017 7:55 am    Post subject: Reply with quote

Ok, since I don't have the game I modified it to this for testing
Code:
ByX = 1
ByY = 2
ByZ = 3
botX = 4
botY = 5
botZ = 6
Cam_X = 7
Cam_Y = 8


I still get an error on line 21 which is
Code:
calcX=readFloat(ByX)-readFloat(botX)
Which is trying to use the values ByX and botX as addresses/pointers to floats, but you read those as floats, so it looks like you're trying to use the x positions as addresses, since those are probably invalid addresses one or both read calls return nil and you then get an error trying to subtract [from] nil.

So, did you really intend to read from memory again there or did you just want to use the floats that you'd already read from memory?

----

btw, with the check for key v inside the timer it will only check for v once every 10 seconds (since the timer is set to an interval of 10000 milliseconds), that doesn't really seem like what you'd want. With the values being global (not local to the script) you can use CE's hotkeys which "constantly" check for you and allow up to 5 keys eg.

Code:
...
-- to disable, destroy timer t and hotkey h
t=createTimer(1)
timer_setInterval(t, 3000) -- can also use t.Interval = 3000
timer_onTimer(t, sight_angle) -- can also use t.OnTimer = sight_angle

-- set initial values so they aren't nil if user presses v before timer runs
-- passing nil will write 0, but it's more intuitive to use 0 if you want that :)
angleX = readFloat(Cam_X)
angleY = readFloat(Cam_Y)

-- takes a function to run and up to 5 virtual key codes (can be in a table)
h = createHotkey(function()
  writeFloat(Cam_X, angleX)
  writeFloat(Cam_Y, angleY)
end, VK_V)
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jgoemat
Expert Cheater
Reputation: 18

Joined: 25 Sep 2011
Posts: 195

PostPosted: Wed Feb 21, 2018 3:27 am    Post subject: Reply with quote

To help you debug in the future, the error message says line 21:

Code:
calcX=readFloat(ByX)-readFloat(botX)


The first thing I'd do would be to separate that out into the smallest pieces of code you can and print the values:

Code:
local x1 = readFloat(ByX)
print("x1 is "..tostring(x1).." from address "..tostring(ByX))
local x2 = readFloat(botX)
print("x2 is "..tostring(x2).." from address "..tostring(botX))
calcX = x1-x2


That takes about 2 minutes and you can see quickly in the lua window that at least one of x1 or x2 is nil and why, and that the error is on the last line now so the subtract is failing and not the calls to readFloat().
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