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Why does this crash the game?

 
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thethiny
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PostPosted: Sun Jul 17, 2016 1:40 pm    Post subject: Why does this crash the game? Reply with quote
Hi,
I'm new to using Windows DLL Calls, so I might not know how they work exactly.
I have this segment of the code
Code:

CheckFile:
push rcx
push rax
push rdx
sub rsp,20
lea rcx, [data]
call SHLWAPI.PathFileExistsA
mov [bool],eax
add rsp,20
pop rdx
pop rax
pop rcx

That crashes whenever it reaches "call SHLWAPI.PathFileExistsA"
I try commenting it out and the game works fine. Why does this line not work? What would cause the game to crash?
Thanks
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mgr.inz.Player
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PostPosted: Sun Jul 17, 2016 1:46 pm    Post subject: Reply with quote
Try this one:
Code:
CheckFile:
push rax
push rcx
push rdx
push r8
push r9

lea rsp,[rsp-28]

mov rcx,data
call SHLWAPI.PathFileExistsA
mov [bool],eax

lea rsp,[rsp+28]

pop r9
pop r8
pop rdx
pop rcx
pop rax

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thethiny
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PostPosted: Sun Jul 17, 2016 2:05 pm    Post subject: Reply with quote
Thanks, it solved the crash issue, still the code is functioning, but at least the crash has been solved Very Happy
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akumakuja28
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PostPosted: Sun Jul 17, 2016 4:08 pm    Post subject: Reply with quote
thethiny wrote:
Thanks, it solved the crash issue, still the code is functioning, but at least the crash has been solved Very Happy




Did you set up a compare on the [bool].


Something like

Code:


cmp [bool],1
je Load_String
jne originalcode


Load_String:
However you wrote your code to replace the string.



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