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Readmem with a symbol?

 
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Redouane
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Joined: 05 Sep 2013
Posts: 363
Location: Algeria

PostPosted: Tue Dec 23, 2014 8:17 am    Post subject: Readmem with a symbol? Reply with quote

Hi,while making an AOB script for a flash game (that works for different versions,uses aobscans and readmem),I got an error with readmem,I am able to reproduce it in this simple example:
Code:

alloc(m,1024)
label(zone)
registersymbol(zone)
m+8:
zone:
db 04 ef 40 87 ad 0c
m:
readmem(zone,6) // Error

while this works just fine:
Code:

alloc(m,1024)
label(zone)
registersymbol(zone)
m+8:
zone:
db 04 ef 40 87 ad 0c
m:
db 90 90 90 90 90 90 90 90 // Writing bytes normally

So,the address of readmem cannot be a userdefined symbol?Do I have to use {$lua} to return
Code:
'readmem('..getAddress'zone'..',6)'


[Edit] The error only happends when the symbol isn't defined when the execute button is clicked,even if the 'registersymbol' statement is in the script.
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Dark Byte
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Posts: 25788
Location: The netherlands

PostPosted: Tue Dec 23, 2014 8:51 am    Post subject: Reply with quote

readmem(zone,6) gets renamed into "db xx xx xx xx xx xx" where xx are the bytes it reads before the script gets executed

because zone does not exist at the time readmem is handled it fails (allocs are handled after everything else has been done, so readmem is handled before m is allocated)

Also, even if it did work, that readmem(zone,6) command would be equivalent to db 00 00 00 00 00 00 as the readmem instruction gets handled before the assembler code is written.

AOBscan's are handled before readmem, so if you give it the symbol of an AOBscan result, that will work

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Redouane
Master Cheater
Reputation: 3

Joined: 05 Sep 2013
Posts: 363
Location: Algeria

PostPosted: Tue Dec 23, 2014 9:24 am    Post subject: Reply with quote

Dark Byte wrote:
readmem(zone,6) gets renamed into "db xx xx xx xx xx xx" where xx are the bytes it reads before the script gets executed

because zone does not exist at the time readmem is handled it fails (allocs are handled after everything else has been done, so readmem is handled before m is allocated)

Also, even if it did work, that readmem(zone,6) command would be equivalent to db 00 00 00 00 00 00 as the readmem instruction gets handled before the assembler code is written.

AOBscan's are handled before readmem, so if you give it the symbol of an AOBscan result, that will work


Thanks,the symbol of 'readmem' in my script isn't really the result of an aobscan,it's a label that is at (aobscanresult + offset),here is a part of my code:
Code:

label(m)
aobscan(c,xx xx xx xx...)
label(_g)
label(init)
registersymbol(_g)
registersymbol(init)
c + 23:
_g:
c + 3b:
init:
M + 42: // M is another AOBScan result
m:
readmem(_g,7)
readmem(init,7)
db 02 02 02 02

[EDIT] I solved the problem,not sure if there is a simplier way to do it,used {$lua} and a timer,from the onTimer,did an autoAssemble with the code that uses readmem.
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