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Calling and use windows apps library function via CE Lua
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Corroder
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PostPosted: Tue Jan 14, 2020 6:26 am    Post subject: Calling and use windows apps library function via CE Lua Reply with quote

Hi, are there easy ways (including tutorial if any) to call windows apps library function and use in CE Lua script.

Say, I knew what is a windows apps library (dll) functions including the parameters (easy to be found on MSDN), then how the easy way to call it via CE Lua script?.

Say for example: call 'mciSendCommandA' a function own by winmm.dll

Any helps, tutorial or suggestions from CE Lua experts?.



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PostPosted: Tue Jan 14, 2020 6:47 am    Post subject: Reply with quote

ce already has winmm loaded by default, so you can just do
Code:

memorystore=createMemoryStream()

--use memorystore.writeByte/Word/Dword to fill in the memorystore

executeCodeLocalEx('mciSendCommandA', IDDevice, msg, flags, memorystore.Memory)

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Corroder
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PostPosted: Tue Jan 14, 2020 8:50 am    Post subject: Reply with quote

Thanks, DB for the answer and sample.
Anyway, is CE loaded all windows libraries functions or only some libs. by default, I mean in CE 7.0 ?. Thanks

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Aylin
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PostPosted: Tue Jan 14, 2020 9:14 am    Post subject: Reply with quote

CE 7.0; It all started with "executeCodeLocalEx()".
Now I miss some old functions. Smile
Please DB; 32-bit Trainer.exe must have code that supports 32-64 bit scanners!

is "targetIs64Bit ()" in the .exe installation: does not work in a 32-bit browser.
Or, while "targetIs32Bit" is: 64 bit does not work in the browser.
2 separate Trainer produce and determine the area of use, + process is happening. Smile

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Corroder
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PostPosted: Sun Jan 19, 2020 5:20 am    Post subject: Reply with quote

Follows DB information, I try using executeCodeLocalEx() for learn purpose.

Code:
function MessageBox()
 memorystore=createMemoryStream()
 executeCodeLocalEx("user32.MessageBoxA", HWND, LPCSTR, LPCSTR, UINT, memorystore.Memory)
end

MessageBox(0, "Hello From Lua", "User32 Message Box", 0)


Not work. How use executeCodeLocalEx() properly?. Any example / tutorial?

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mgr.inz.Player
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PostPosted: Sun Jan 19, 2020 5:55 am    Post subject: Reply with quote

executeCodeLocalEx() for now only 64bit CE

Code:

function MessageBox(title,text,uType)
 return executeCodeLocalEx("user32.MessageBoxA", MainForm.Handle, text, title, uType)
end

local a = MessageBox("The title", "the text", 1) -- MB_OKCANCEL
print(a) -- 1 - OK, 2 - cancel

local a = MessageBox("The title", "the text", 2) -- MB_ABORTRETRYIGNORE
print(a) -- 3 - ABORT 4 - RETRY 5 - IGNORE

local a = MessageBox("The title", "the text", 4) -- MB_YESNO
print(a) -- 6 - YES 7 - NO

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Corroder
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PostPosted: Sun Jan 19, 2020 8:16 am    Post subject: Reply with quote

mgr.inz.Player wrote:
executeCodeLocalEx() for now only 64bit CE


Thank you for the example, that is I need to understand the concept while using executeCodeLocalEx().
Anyhow when executing your example code above, CE suddenly stops working. What's wrong?.

My system: Win 7 Ultimate (64bit) and CE 7.0 (running cheatengine-x86_64,exe).

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PostPosted: Sun Jan 19, 2020 8:27 am    Post subject: Reply with quote

Hmm. Something's wrong.

After you said you have CE freeze issues I tried executing my examples many many times in row. And CE closed itself without any errors.

I will check it with GDB.

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Aylin
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PostPosted: Sun Jan 19, 2020 8:28 am    Post subject: Reply with quote

Corroder wrote:
mgr.inz.Player wrote:
executeCodeLocalEx() for now only 64bit CE


Thank you for the example, that is I need to understand the concept while using executeCodeLocalEx().
Anyhow when executing your example code above, CE suddenly stops working. What's wrong?.

My system: Win 7 Ultimate (64bit) and CE 7.0 (running cheatengine-x86_64,exe).


It works for me.
my system: Win 10 (64bit) and CE 7.0 (running cheatengine-x86_64,exe)

result:
1
4
6



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Ekran3.PNG



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mgr.inz.Player
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PostPosted: Sun Jan 19, 2020 8:47 am    Post subject: Reply with quote

Play with it a little more. Execute MessageBox function.
With messagebox still visible try to click other CE windows ('Lua Engine', 'MemoryViewer').


I get this under GDB
Code:
gdb: unknown target exception 0xc0000028 at 0x7fffbfe9eb78

Program received signal ?, Unknown signal.
0x00007fffbfe9eb78 in ?? ()
(gdb) bt
#0  0x00007fffbfe9eb78 in ?? ()
#1  0x12020e2100000000 in ?? ()
#2  0x0000000000450e21 in SYSUTILS$_$TUNICODEENCODING_$__$$_GETPREAMBLE$$TBYTES ()
#3  0x0000000000f328c0 in VMT_$STDCTRLS_$$_TCUSTOMBUTTON ()
#4  0x0000000000f31f88 in VMT_$STDCTRLS_$$_TBUTTONACTIONLINK$indirect ()
#5  0x00000000000602ff in ?? ()
#6  0x0000000000000000 in ?? ()
(gdb)

Probably above backtrace also is wrong because of stack corruption...


EDIT:
Stacktrace shown from another CE instance attached to crashed CE:

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Last edited by mgr.inz.Player on Sun Jan 19, 2020 9:30 am; edited 1 time in total
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Corroder
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PostPosted: Sun Jan 19, 2020 9:18 am    Post subject: Reply with quote

Probably above backtrace also is wrong because of stack corruption or libraries conflict when loading, incase in windows 64 system there are two user32.dll (in System32 and SysWOW64).

Code:
--local path = "C:\\Windows\\SysWOW64\\user32.dll"
local path = "C:\\Windows\\System32\\user32.dll"
local f = assert(package.loadlib(path, "luaopen_user32"))
f()

memorystore=createMemoryStream()

function MessageBox(title,text,uType)
 return executeCodeLocalEx("user32.MessageBoxA", MainForm.Handle, text, title, uType)
end

local a = MessageBox("The title", "the text", 1, memorystore.Memory) -- MB_OKCANCEL
print(a) -- 1 - OK, 2 - cancel

local a = MessageBox("The title", "the text", 2, memorystore.Memory) -- MB_ABORTRETRYIGNORE
print(a) -- 3 - ABORT 4 - RETRY 5 - IGNORE

local a = MessageBox("The title", "the text", 4, memorystore.Memory) -- MB_YESNO
print(a) -- 6 - YES 7 - NO


The code above makes CE hang/crash. Anyhow, the important point for this topic is how to implementing executeCodeLocalEx() by the example given.

EDIT: which GDB version you use?. 8.3 ?

@Aylin: The code works on your machine. Is it show a 'message box' GUI?

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mgr.inz.Player
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PostPosted: Sun Jan 19, 2020 9:32 am    Post subject: Reply with quote

Quote:
which GDB version you use?. 8.3 ?

GDB shipped with Lazarus.


Those message windows do not crash CE:
Code:
-- messageDialog(text,messagetype,buttons,...)
-- messagetype:
-- 0 - mtWarning;
-- 1 - mtError;
-- 2 - mtInformation;
-- 3 - mtConfirmation;

messageDialog('Test1',0,mbYes,mbNo)
showMessage('Test2')

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Corroder
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PostPosted: Sun Jan 19, 2020 10:48 am    Post subject: Reply with quote

mgr.inz.Player wrote:

EDIT:
Stacktrace shown from another CE instance attached to crashed CE:


So, how to fix the problem?. Any chance?

EDIT:
I found this using VS Debugger

Unhandled exception at 0x00000000778D96F8 (ntdll.dll) in cheatengine-x86_64.exe: 0xC0000028: An invalid or unaligned stack was encountered during an unwind operation.

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PostPosted: Sun Jan 19, 2020 11:31 am    Post subject: Reply with quote

Messagebox will start it's own messageloop dispatcher (dispatchmessage) while it's still inside lua's stack
so, it will invoke lua's cleanup routines while some of it's internal locks are still held, and while the current thread is the owner thread, this will be allowed.

look into re-entrant code and functions, I don't think lua is one of these

also, if an exception happens and it would backtrace, it would end up crashing as it's not in an actual stack

(could of course be that the stack is not properly setup, but do some tests with easier functions that don't end up calling all of CE)

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Aylin
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PostPosted: Sun Jan 19, 2020 12:12 pm    Post subject: Reply with quote

@Aylin: The code works on your machine. Is it show a 'message box' GUI?[/quote]

I am sorry for my late answer.
Yes, Windows warning message is coming.
It looks like you have enabled VB.Script. Smile



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