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Rawing
Cheater

Reputation: 0

Joined: 01 May 2010
Posts: 42
Location: Austria

Posted: Tue May 12, 2015 10:41 am Post subject: Remove Controls from Form

I'm trying to remove Controls (buttons, labels, etc...) from a Form. I wrote the following code:

Code:

function wipe_window()
--for _, control in pairs(win.Control) do --the Control array is always empty, unexpectedly
-- control:destroy()
--end
while win.ControlCount > 0 do
local control= win:getControl(0)
control:destroy()
end
end

win= createForm()
control_setSize(win, 200, 200)
w= createButton(win)
control_setCaption(w, "wipe")
control_setPosition(w, 5, 5)
w.onClick= wipe_window

It does remove all Controls, but it also produces an "access violation" error or causes Cheat Engine to hang. What am I doing wrong?
_________________

Game over! Die again!

panraven
Grandmaster Cheater

Reputation: 55

Joined: 01 Oct 2008
Posts: 942

Posted: Tue May 12, 2015 11:48 am Post subject:

It seems this work by using a callLater function:

Code:

local function callLater(d,f,...)
local t,a,n = createTimer(),{...},select('#',...)
t.Interval = d
t.OnTimer = function(sender) sender.Destroy() f(unpack(a,1,n)) end
t.Enabled = true
return t
end

function wipe_window()
for i=0,win.ControlCount-1 do -- can't use WHILE as controlCount is not updated
local control= win:getControl(i)
callLater(1,control.destroy)
end
end

win= createForm()
control_setSize(win, 200, 200)
for i=1,5 do
local w= createButton(win)
control_setCaption(w, "wipe "..i)
control_setPosition(w, 5, 5+i*25)
w.onClick= wipe_window
end

Also this work without using callLater:

Code:

function wipe_window(sender) -- added the sender/owner parameter
local next = 0
while win.ControlCount > 1 do -- one button should left which is the one being clicked,ie. sender
local control= win:getControl(next)
if control ~= sender then control.destroy() else next = 1 end
end
end

win= createForm()
control_setSize(win, 200, 200)
for i=1,5 do
local w= createButton(win)
control_setCaption(w, "wipe "..i)
control_setPosition(w, 5, 5+i*25)
w.onClick= wipe_window
end

... but this might not what you intended, as one child control is left.
This only to show that, if control.Destroy is calling from OnClick function of the exact control of owner/sender, it may be the cause of access violation.

Finally, still using callLater, but least modifying your code,

Code:

function wipe_window2()
while win.ControlCount > 0 do
local control= win:getControl(0)
control.destroy()
end
end

function wipe_window() callLater(1,wipe_window2) end

Dark Byte
Site Admin

Reputation: 458

Joined: 09 May 2003
Posts: 25288
Location: The netherlands

Posted: Tue May 12, 2015 2:16 pm Post subject:

don't destroy the caller also, instead of destroy, set visible to false _________________ Do not ask me about online cheats. I don't know any and wont help finding them. Like my help? Join me on Patreon so i can keep helping

Rawing
Cheater

Reputation: 0

Joined: 01 May 2010
Posts: 42
Location: Austria

Posted: Tue May 12, 2015 4:59 pm Post subject:

Thanks for the help guys. I'll have to rewrite some parts of my code. _________________ Game over! Die again!

DaSpamer
Grandmaster Cheater Supreme

Reputation: 52

Joined: 13 Sep 2011
Posts: 1578

Posted: Tue May 12, 2015 7:36 pm Post subject:

Code:

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