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h4c0r-BG
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 Posted: Sun Nov 18, 2007 6:01 am Post subject: WriteProcessMemory - using pointers - value changing ? |
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I've started making a simple trainer. But i don't know why exactly when i use pointer (i am not sure if it is) but it does not work.
I don't get compiling errors but whenever i press the button to inject the value it just does not change to 1000 (in step two CE tutorial) it does nothing 
But if i don't use pointer method and directly change the addres it just works fine...
So how to use pointers with writeprocessmemory in "the right way" ? 
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Dark Byte
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| Posted: Sun Nov 18, 2007 6:05 am Post subject: |
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first do a readprocessmemory on 459138
and add the value 320 to it
then write the address you get as result with the value you like
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h4c0r-BG
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| Posted: Sun Nov 18, 2007 6:11 am Post subject: |
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Can you give me an example if I use this code:
| Code: | Function GetAddyfrmpointer(baseaddress:dword;offset:dword):dword;
var a: dword;
x: dword;
i: integer;
offsetcount: integer;
offsets:array of dword;
b:integer;
maxid:integer;
begin
offsetcount:=1;
b:=0;
setlength(offsets,1);
offsets[b]:=offset;
a:=baseaddress;
i:=0;
while (i<offsetcount) do
begin
if not readprocessmemory(processhandle,pointer(a),@a,4,x) then exit;
inc(a,offsets[i]);
inc(i);
result:=a
end;
end; |
I mean where to use "a" in writeprocessmemory (i think i need "a" which will be $xxxxxx+320)
Or i am wrong ?
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Noz3001
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| Posted: Sun Nov 18, 2007 9:53 am Post subject: |
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| Read the value of 00459138 into a buffer then + the offset to it. Then write your value to the address stored in the buffer.
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Dark Byte
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| Posted: Sun Nov 18, 2007 1:57 pm Post subject: |
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if you use GetAddyfrmpointer then you call it like:
writeprocessmemory(processhandle,pointer(GetAddyfrmpointer($459138,$320)),@value,4,write);
of course, GetAddyfrmpointer only supports level1 pointers, so level2 you have to do manually
also, look at the add address window, it explains how it works:
459138 contains the value d62450
d62450+320=d62770
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Uzeil
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| Posted: Mon Nov 19, 2007 12:56 am Post subject: |
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Technically, GetAddyfrmpointer can support as many level pointers as it likes, by simply being called again.
| Code: | for i:=0 to length(offsets)-1 do
address:=GetAddyfrmpointer(address,offsets[i]); |
EDIT:
I guess I should add that GetAddyfrmpointer can be trimmed down to:
| Code: | Function GetAddyfrmpointer(baseaddress:dword;offset:dword):dword;
var a: dword;
begin
result:=0;
if readprocessmemory(processhandle,pointer(baseaddress),@a,4,nil) then
result:=a
end; |
And if you can pass @result as a param instead of making a variable(not sure if Delphi will allow it), then there's another two lines down and some memory. I'd suggest using an if statement for the return of 0.
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