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[.net] Floats?
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Miaurice
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PostPosted: Sat Feb 12, 2011 6:43 pm    Post subject: [.net] Floats? Reply with quote
Hey CE.org-Com.
I've got some annoying problems with reading Float-Variables from Memory with vb.net.

Some Information: Cheat Engine shows me 2500 for a Float Value. I want this 2500 in my vb.net Program.

I use some API to get a Value at an Address.
Code:
Public Function ReadFloat(ByVal Address As Long)
        Dim Handle As IntPtr = GetProcessHandleByName(ProzessName)
        Dim Result As Single = 0
        ReadProcessMemory(Handle, Address, Result, 4, 0&)

        CloseHandle(Handle)

        Return Result
End Function


This returns 1,159479E+09
If I
Code:
Return Conversion.Hex(Result)
I get 451C4000

Well.
If I click on my Address in Cheat Engine and click on "Display as Hex" it also says 451C4000.
But if I say "Display as Decimal" it gives me 2500 (The Value I want to display in vb.net..)

How does Cheat Engine convert 451C4000 to 2500?
How do I do that in vb.net / c#

Thanks in advance, sry 4 my bl00dy english..
Miaurice.
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atom0s
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PostPosted: Sat Feb 12, 2011 7:52 pm    Post subject: Reply with quote
Try reading as bytes and use the BitConverter class to recast the bytes back to a single / double.
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Dark Byte
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PostPosted: Sat Feb 12, 2011 8:00 pm    Post subject: Reply with quote
have you tried "Return Single" and read into the Single variable ? (no idea if it works, I have no experience with VB and I can't see how VB would get the return type of a function since it doesn't seem to be defined, and what is that "Result" variable ? )
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Miaurice
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PostPosted: Sun Feb 13, 2011 7:00 am    Post subject: Reply with quote
Wiccaan wrote:
Try reading as bytes and use the BitConverter class to recast the bytes back to a single / double.


If I read as Bytes I get 451C4000
If I convert this to Single I get 1,159479E+09

Dark Byte wrote:
have you tried "Return Single" and read into the Single variable ? (no idea if it works, I have no experience with VB and I can't see how VB would get the return type of a function since it doesn't seem to be defined, and what is that "Result" variable ? )


I tried to do it like this:
Code:
Public Function ReadFloat(ByVal Address As Long) As Single

Then I get 1,159479E+09

ReadProcessMemory(Handle, Address, Result, 4, 0&)
3rd Parameter is where to write the 4Bytes.
And "Result" is my Variable
Code:
Dim Result As Single

I Return this Variable at the end.


But if you type 2500 in Calc.EXE (in decimal) and then click on "Hex" it says 9C4.
If you type 451C4000 (Cheat Engine's HEX to 2500 in Decimal) it says 1159479296.
So why is it 1159479296 in Calc.exe and 2500 in CE ?
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Jorg hi
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PostPosted: Sun Feb 13, 2011 8:43 am    Post subject: Reply with quote
Do you have the right... address?

http://stackoverflow.com/questions/272013/c-float-vs-vb-net-single-namin-complainin
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Miaurice
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PostPosted: Sun Feb 13, 2011 8:49 am    Post subject: Reply with quote
Jorg hi wrote:
Do you have the right... address?

stackoverflow . com / questions / 272013 / c-float-vs-vb-net-single-namin-complainin


Of course Very Happy
The same Address in vb.net as in Cheat Engine Wink

Well this link doesn't help me in any way.. but thanks Smile
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Dark Byte
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PostPosted: Sun Feb 13, 2011 1:23 pm    Post subject: Reply with quote
If you set the result manually to 2500.0 and then do Return Conversion.Hex(Result)

what is the outcome of that ? (make sure the .0 is part of value)
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atom0s
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PostPosted: Sun Feb 13, 2011 2:07 pm    Post subject: This post has 1 review(s) Reply with quote
Other then having the wrong address, are you sure its a single and not a double? If you are continuing to get the wrong number, it sounds more like it could be due to the wrong type being used.

If you go to the address in memory with CE do the bytes match what you are reading from the memory?

Also it could be due to notation. 2500.0f is 00401C45, so you may need to reverse the bytes before you convert them to a number. For example in C#:

Code:

            byte[] btNumber = new byte[] { 0x45, 0x1C, 0x40, 0x00 };
            Array.Reverse(btNumber);
            Single sngNumber = BitConverter.ToSingle(btNumber, 0);

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Miaurice
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PostPosted: Mon Feb 14, 2011 3:41 pm    Post subject: Reply with quote
Quote:
If you set the result manually to 2500.0 and then do Return Conversion.Hex(Result)

what is the outcome of that ? (make sure the .0 is part of value)


You mean I should try to set the Value to 2500.0 from my vb.net App (not Cheat Engine)?
I'll try that Smile

Quote:
Other then having the wrong address, are you sure its a single and not a double? If you are continuing to get the wrong number, it sounds more like it could be due to the wrong type being used.


Well the HEX-Value is correct..

Quote:
If you go to the address in memory with CE do the bytes match what you are reading from the memory?

Yes.

Quote:
Also it could be due to notation. 2500.0f is 00401C45, so you may need to reverse the bytes before you convert them to a number. For example in C#:

Code:

byte[] btNumber = new byte[] { 0x45, 0x1C, 0x40, 0x00 };
Array.Reverse(btNumber);
Single sngNumber = BitConverter.ToSingle(btNumber, 0);


Okay I'll try Smile
But if you put in 54C104000 in Microsofts Calc.exe and then press on Dec it says 1159479296
401C45 is 4201541
9C4 is 2500...

So why does Cheat Engine convert 2500 to 54C104000 instead of 9C4 ?
This is weird...

FloatVB.jpg
 Description:
 Filesize:  59.82 KB
 Viewed:  18781 Time(s)

FloatVB.jpg


Last edited by Miaurice on Mon Feb 14, 2011 4:49 pm; edited 2 times in total
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AhMunRa
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PostPosted: Mon Feb 14, 2011 4:22 pm    Post subject: Reply with quote
Hammered this out in C# should work for you as well.

Code:

string val = "451C4000";
Int32 iVal = Convert.ToInt32(val, 16);  / Converts hex number to dec equiv

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Miaurice
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PostPosted: Mon Feb 14, 2011 4:47 pm    Post subject: Reply with quote
AhMunRa wrote:
Hammered this out in C# should work for you as well.

Code:

string val = "451C4000";
Int32 iVal = Convert.ToInt32(val, 16);  / Converts hex number to dec equiv


In VB.NET:
Code:
Dim val As String = "451C4000"
Dim iVal As Int32 = Convert.ToInt32(val, 16)


Result: 1159479296

... :<<<<<<<<<<<<<<<<<<<<<<<

DAMN IT!
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AhMunRa
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PostPosted: Mon Feb 14, 2011 7:25 pm    Post subject: Reply with quote
I think Wiccan is right, read in the bytes then redo the conversion. There is something wonky going on in the code. Anyway you slice it you can not get 9C4 == 2500 from 451C4000. Not without doing Math-FU to it.
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Miaurice
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PostPosted: Tue Feb 15, 2011 7:40 am    Post subject: Reply with quote
Wiccan's Method works Smile

Thanks at all!
Thank you all very very much Smile

For all who have the same Problem and find this Thread:

VB.NET Source-Code:
Code:
Dim MyArray() As Byte = New Byte() {&H45, &H1C, &H40, &H0}
Array.Reverse(MyArray)
Dim MyNumber As Single = BitConverter.ToSingle(MyArray, 0)
MsgBox(MyNumber)

Result: 2500 Smile

To reverse it again:
Code:
Dim MyArray() As Byte = BitConverter.GetBytes(Convert.ToSingle(2500))

Result: An Array containing: {&H45, &H1C, &H40, &H0}
Smile

To fill the Array with the String:
VB.NET Source-Code:
Code:
Dim MyFloatHex As String = "451C4000"
Dim n As Integer = MyFloatHex.Length \ 2
Dim buffer(n - 1) As Byte
For i As Integer = 0 To MyFloatHex.Length - 1 Step 2
    buffer(i \ 2) = Convert.ToByte(MyFloatHex.Substring(i, 2), 16)
Next

This Source-Code was coded by ~blaze~
Threadlink: www . vb-paradise . de / programmieren / hauptforum / p410380-string-verarbeitung-zu-byte / #post410380

Last edited by Miaurice on Tue Mar 29, 2011 12:24 pm; edited 1 time in total
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Jorg hi
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PostPosted: Tue Feb 15, 2011 2:58 pm    Post subject: Reply with quote
Lol obviously his solution was right, I already + repped him a long time ago.
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Miaurice
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PostPosted: Tue Feb 15, 2011 5:48 pm    Post subject: Reply with quote
Jorg hi wrote:
Lol obviously his solution was right, I already + repped him a long time ago.

Glückwunsch
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