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MaDDoX
How do I cheat?
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Joined: 03 Aug 2009
Posts: 1
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 Posted: Mon Aug 10, 2009 11:12 am Post subject: Little-endian Number to Float (in bytes) routine |
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Hey guys, I'm coding a trainer in Delphi 7 and it's working just fine, the problem is that the game's numeric (with decimals) values are stored as Float in memory. I can update the values in memory correctly by checking Cheat Engine's memory browser window in Float, editing the numeric value to what I want then changing the display to byte to know the byte sequence I should write to memory. That'd do just fine if all I had to mod were a couple a fixed values, but I want the user to be able to input some of those. The full conversion process seems quite complicated from what I've researched, so I was thinking if any of you guys already have a routine to do it that you could share. I can convert C code to delphi no problem if needed.
I'd be super-appreciative if you can help or give me some hints. Thanks in advance!
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Deltron Z
Expert Cheater
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Joined: 14 Jun 2009
Posts: 164
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| Posted: Mon Aug 10, 2009 11:22 am Post subject: |
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Floating point numbers work in a little bit more complex way. (IEEE 754: en.wikipedia.org/wiki/IEEE_754-2008)
You can easily solve this problem, if your inside the process memory then in C, you could've done something like:
| Code: | | *(float*)Address = 3.14159; |
Or just have a buffer of 4 bytes (or 8 for double) and copy the memory to an array of bytes (or simply convert, if the compiler will allow) like this:
| Code: | float x = 3.14159;
WriteProcessMemory(Handle, (BYTE*)x, sizeof(x), ...); |
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Dark Byte
Site Admin
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Joined: 09 May 2003
Posts: 25973
Location: The netherlands
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| Posted: Mon Aug 10, 2009 11:28 am Post subject: |
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delphi's floating point variable types are single and double
so:
| Code: |
var myvalue: single;
...
myvalue:=99.9;
WriteProcessMemory(handle, @myvalue, sizeof(myvalue), ....);
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also, StrToFloat is a nice function to look into
and you can just do:
floatvalue:=intvalue; (not the other way around though)
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MaDDoX
How do I cheat?
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Joined: 03 Aug 2009
Posts: 1
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| Posted: Tue Aug 11, 2009 4:00 pm Post subject: |
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| Dark Byte wrote: | delphi's floating point variable types are single and double
so:
| Code: |
var myvalue: single;
...
myvalue:=99.9;
WriteProcessMemory(handle, @myvalue, sizeof(myvalue), ....);
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OMG, it worked.. so all I had to do was directly assign the float value to the right type of variable? Jeez.
Thanks a lot for the great help, I thought I'd be flamed or something, you guys rock 
Here's my (WIP) code in case anyone wants it:
| Code: | procedure TForm1.BtnLaunchClick(Sender: TObject);
var pID: Cardinal;
hProcess: Cardinal;
lpNumOfBytes: Cardinal;
lpBuffer: Integer;
wrtBuffer: Single;
begin
try
GetWindowThreadProcessId(FindWindow(nil, 'Z Steel Soldiers'), pID);
hProcess := OpenProcess(PROCESS_ALL_ACCESS, FALSE{!!}, pID{!!});
//7E22BC + C = Tough Unit + Vision Ofs
if ReadProcessMemory(hProcess, Ptr($007E22BC), @lpBuffer, sizeof(lpBuffer), lpNumOfBytes) = false then label2.caption := 'Read Error';
lpBuffer:=lpBuffer+$C; //Apply Offset
wrtBuffer := 11.0; // New value, original is 14
if WriteProcessMemory(hProcess, Ptr(lpBuffer), @wrtBuffer, sizeof(wrtBuffer), lpNumOfBytes) = false then label2.caption := 'Write Error';
finally
CloseHandle(hProcess);
end;
end; |
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