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Set pointer address to a symbol

 
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careca777
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PostPosted: Tue Jan 12, 2021 7:04 am    Post subject: Set pointer address to a symbol Reply with quote

Hi, i've tried, searched, finaly gave up and ask for your help, this should be simple enough but i just dont see it.
How can i set the address from a pointer into a symbol, so i can use the symbol as an address base afterwards?

This is what i tried:

Code:
[ENABLE]
registersymbol(VehicleMain)
alloc(VehicleMain,4)
//VehicleMain:
//[["somexe.exe"+027DEFD0]+0]+8C4
//mov [VehicleMain],[[["somexe.exe"+027DEFD0]+0]+8C4]
define(VehicleMain,[["somexe.exe"+027DEFD0]+0]+8C4)
[DISABLE]


My logic was that i would assign the pointer into the symbol, but it's not getting anything.

Thanks in advance.
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ParkourPenguin
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PostPosted: Tue Jan 12, 2021 12:43 pm    Post subject: Reply with quote

This should work:
Code:
[ENABLE]
define(VehicleMain,[["somexe.exe"+027DEFD0]+0]+8C4)
registersymbol(VehicleMain)
[DISABLE]
unregistersymbol(VehicleMain)

If it doesn't, this will, but note you'll have to dereference the symbol VehicleMain once to get at the actual pointed value:
Code:
[ENABLE]
alloc(VehicleMain,8)
registersymbol(VehicleMain)

VehicleMain:
{$lua}
return ("dq %08X"):format(syntaxcheck and 0 or getAddress'[["somexe.exe"+027DEFD0]+0]+8C4')
{$asm}


[DISABLE]
dealloc(VehicleMain)
unregistersymbol(VehicleMain)

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careca777
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Posts: 51

PostPosted: Tue Jan 12, 2021 2:10 pm    Post subject: Reply with quote

Hi, thank you for the reply.

I tested the code and for the first one, it returns something that doesn't make sense, an address like: 42211C723EB22E1E

The second code works, but im struggling to "adjust the address" like i would before, in asm like this:

Code:
sub [VehicleMain],8C4


Adding that bit to the code in asm section doesnt make anything.

So for my table purpose, i need to remove 8C4 from the resulting address, so that it sits nicely in the table.
Because i have so many entries, i think would be easier this way, instead of adjusting each entry in the table.

Aditionally, is it possible to run this in a loose loop, so that all the table entries that read VehicleMain, get updated automaticaly?
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ParkourPenguin
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PostPosted: Tue Jan 12, 2021 5:45 pm    Post subject: Reply with quote

The first one registers the symbol VehicleMain to be literally the address [["somexe.exe"+027DEFD0]+0]+8C4 - whatever that may be. You probably dereferenced it when you weren't suppose to.

careca777 wrote:
So for my table purpose, i need to remove 8C4 from the resulting address, so that it sits nicely in the table.
Remove the last offset or change it to 0. i.e. [["somexe.exe"+027DEFD0]+0]


From everything I've read so far, this might work better for you:
  1. Right click the address list, "Create Header", say yes when it asks you about an address
  2. Change the header's address: pointer, base address '"somexe.exe"+027DEFD0', 2 offsets both 0
  3. Add another address to the address list, address "+8C4", value type whatever
  4. Click and drag that new memory record onto the header

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careca777
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PostPosted: Tue Jan 12, 2021 6:10 pm    Post subject: Reply with quote

Yes, thank you!
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careca777
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PostPosted: Wed Jan 13, 2021 6:02 pm    Post subject: Reply with quote

Hi again, i tried to place the code in a while loop, so it keeps refreshing, but it ends as if there was no loop, what would be the best approach?

Thanks in advance.
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