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BanCheese
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Joined: 22 Oct 2014
Posts: 49
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 Posted: Sat Nov 15, 2014 4:15 pm Post subject: Issue with luacall() |
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So I've been trying to use luacall() in a script. When I assemble and inject it, my code works fine, but the luacall() stuff isn't there. Here's the script:
| Code: |
alloc(newmem,2048)
alloc(modulename,2048)
label(returnhere)
label(originalcode)
label(popandoriginalcode)
label(findlenloop)
label(cmploop)
label(aftercmploop)
label(changeesi)
label(exit)
modulename:
db 68, 69
newmem:
push eax
push ebx
push ecx
push edx
mov ebx,[esp+28]
cmp [esp+10],ebx
jne popandoriginalcode
mov eax, 0
mov ecx, 0018EA50
cmploop:
mov dl,[modulename+eax]
cmp dl,0
je aftercmploop
cmp [ecx+eax],dl
jne popandoriginalcode
inc eax
jmp cmploop
aftercmploop:
luacall(readRegionFromFile("script.lua", 00186444))
mov eax, 00186444
findlenloop:
mov dl, [eax]
cmp dl,00
je changeesi
inc eax
jmp findlenloop
changeesi:
mov esi,eax
popandoriginalcode:
pop edx
pop ecx
pop ebx
pop eax
originalcode:
mov edx,[ebp+08]
mov eax,edi
exit:
jmp returnhere
"Jcmp.dll"+5F705D:
jmp newmem
returnhere:
"Jcmp.dll"+5F5111:
jmp Jcmp.dll+5F511F
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Here's a pic of the debugger, with an arrow where the luacall() is supposed to be. When I step through that area, it passes like there's nothing there. What am I doing wrong?
Well, I'm not allowed to post links yet, so I hope this is allowed: i(dot)imgur(dot)com/OPKBJvS.png
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Dark Byte
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Joined: 09 May 2003
Posts: 25288
Location: The netherlands
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| Posted: Sat Nov 15, 2014 5:27 pm Post subject: |
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luacall is a command processor, not an assembler command
that means that as soon as the auto assembler script gets executed it will load script.lua into 00186444
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BanCheese
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| Posted: Sat Nov 15, 2014 6:06 pm Post subject: |
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*Sigh* I'm an idiot. Well, is there any way to call that function in real time?
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Dark Byte
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| Posted: Sat Nov 15, 2014 6:28 pm Post subject: |
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using the lua template
but why load it at runtime? Does the file change multiple times after injection?
And if it does, why not use writeString to update it when the user wants
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BanCheese
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| Posted: Sat Nov 15, 2014 7:46 pm Post subject: |
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I suppose it doesn't have to be in real time -- I thought of a way to get around that. Anyway, I'm now I'm using readRegionFromFile("script.lua", scriptstorage), where scriptstorage is memory that I've alloc'd. For some reason, it won't load anything in. Note that this was also happening with the static address as seen above, even when the game was paused and thus not writing to those addresses. What dir should I be putting the file in, and can I specify a full path, too? Thanks!
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Dark Byte
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Location: The netherlands
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| Posted: Sat Nov 15, 2014 7:54 pm Post subject: |
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you have to specify a full path (and make sure the address has enough memory)
Easiest path is inside the cheat engine folder because then you can use
| Code: |
filename=getCheatEngineDir()+'script.lua'
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alternatively, you could let the use choose the file using an OpenDialog
| Code: |
local od=createOpenDialog(nil)
od.execute()
filename=od.filename
od.destroy()
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(also if you didn't allocate it yourself, use fullAccess(address,size) first to make the memory writable)
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BanCheese
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Joined: 22 Oct 2014
Posts: 49
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| Posted: Sat Nov 15, 2014 8:02 pm Post subject: |
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Hmm, I tried what you said, but it still isn't loading anything.
| Code: |
{$lua}
local od = createOpenDialog(nil)
od.execute()
filename = od.filename
print(filename)
od.destroy()
readRegionFromFile(filename, scriptstorage)
{$asm}
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print(filename) Prints out a valid path (with the drive letter). OH. Just got an idea while writing this. The path has backslashes; does CE want forward slashes?
Oh, and yes, I did allocate it myself, so I already have full access.
Any ideas?
Thanks!
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Dark Byte
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| Posted: Sat Nov 15, 2014 8:09 pm Post subject: |
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does scriptstorage hold a valid address ? And you're sure it's big enough to hold the file you picked ?
add print(string.format("scriptstorage=%x", scriptstorage))
the path has to have slashes the way the OS wants it (so in windows backslashes)
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BanCheese
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Joined: 22 Oct 2014
Posts: 49
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| Posted: Sat Nov 15, 2014 8:13 pm Post subject: |
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Hmm, you're right, it wouldn't print because scriptstorage is nil. Do I need to 'import' the variable into lua, or something like that?
| Code: |
alloc(newmem,2048)
alloc(modulename,2048)
alloc(scriptstorage,1000000)
label(returnhere)
label(originalcode)
label(popandoriginalcode)
label(findlenloop)
label(cmploop)
label(aftercmploop)
label(copyloop)
label(changeesi)
label(exit)
{$lua}
local od = createOpenDialog(nil)
od.execute()
filename = od.filename
print(filename)
print(string.format("scriptstorage=%x", scriptstorage))
od.destroy()
readRegionFromFile(filename, scriptstorage)
{$asm} |
It's worth it to note that yes, the alloc is getting detected. When I execute it, CE gives me the little pop with the address for it.
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Dark Byte
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Posts: 25288
Location: The netherlands
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| Posted: Sat Nov 15, 2014 8:19 pm Post subject: |
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ah yes, unlike luacall {$lua} runs before the alloc is executed
change your script to:
| Code: |
alloc(newmem,2048)
alloc(modulename,2048)
label(returnhere)
label(originalcode)
label(popandoriginalcode)
label(findlenloop)
label(cmploop)
label(aftercmploop)
label(copyloop)
label(changeesi)
label(exit)
label(scriptstorage)
{$lua}
autoAssemble([[
globalalloc(scriptstorage,1000000)
]])
--globalalloc will allocate it once and reuse it over each time (it also registers it automatically for you)
local scriptstorage=getAddress("scriptstorage")
local od = createOpenDialog(nil)
od.execute()
filename = od.filename
print(filename)
print(string.format("scriptstorage=%x", scriptstorage))
od.destroy()
readRegionFromFile(filename, scriptstorage)
{$asm}
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edit: I had a second script but that wouldn't have worked (alloc'ed memory gets allocated after everything has been done)
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BanCheese
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Joined: 22 Oct 2014
Posts: 49
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| Posted: Sat Nov 15, 2014 8:31 pm Post subject: |
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Well, I hate to keep buggin' you, but it still isn't working. Here's my code:
| Code: | {$lua}
function importFile(scriptstorage)
local od = createOpenDialog(nil)
od.execute()
filename = od.filename
print(filename)
print("location: " .. scriptstorage)
od.destroy()
readRegionFromFile(filename, scriptstorage)
end
{$asm}
alloc(newmem,2048)
alloc(modulename,2048)
alloc(scriptstorage,1000000)
label(returnhere)
label(originalcode)
label(popandoriginalcode)
label(findlenloop)
label(cmploop)
label(aftercmploop)
label(copyloop)
label(changeesi)
label(exit)
luacall(importFile(scriptstorage))
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Here's my error (From the lua console):
| Code: | | Error:[string "local syntaxcheck=......"]:7: attempt to concatenate local 'scriptstorage' (a nil value) |
So for some reason it's STILL nil. Any ideas? Thanks!
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Dark Byte
Site Admin
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Posts: 25288
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| Posted: Sat Nov 15, 2014 8:31 pm Post subject: |
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yeah, that version of the script won't work. luacall doesn't know what the address is going to be. check the other solution
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Do not ask me about online cheats. I don't know any and wont help finding them.
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BanCheese
Cheater
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Joined: 22 Oct 2014
Posts: 49
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| Posted: Sat Nov 15, 2014 8:35 pm Post subject: |
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Yes! It works, thanks so much! I've been working on this script for weeks and I'm really happy to finally have it done. Thanks again!
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