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pirateninja
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Joined: 20 Aug 2005
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 Posted: Thu May 25, 2006 7:35 pm Post subject: "4byte" length. |
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| Unsatisfied with the Cheat Engine's trainer maker, I decided to use the addresses I found using CE to make my own trainer in VB. I can do bytes, longs, and doubles, but Not 4byte. Using WriteProcessMemory, the length of a byte is 1, the length of an integer is 2, and the length of a long is 4. What length would I use for a 4byte? |
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Dark Byte
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Joined: 09 May 2003
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Location: The netherlands
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| Posted: Fri May 26, 2006 1:10 am Post subject: |
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hehe, nice joke
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pirateninja
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Joined: 20 Aug 2005
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| Posted: Fri May 26, 2006 9:31 am Post subject: |
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It wasn't a joke  . I know vb is slow but im not doing any freeze-values so it doesn't need to be that fast. It's just that there's more complex stuff going on than pressing a button and changing a value, which can't be done with CE's trainer maker. A byte is the length of 1, so logic would tell me that a 4byte would be 4, but long is 4. |
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Turtle
Advanced Cheater
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Joined: 25 Jul 2004
Posts: 85
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| Posted: Fri May 26, 2006 9:44 am Post subject: |
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I don't think that the data type matters, if it's 4 bytes, it's 4 bytes.
For example you can have a 4 byte integer, long, float ..etc, the point is when you convert any of those to hex they will all be in this format anyway: 00 00 00 00
As you can see, 4 bytes.
To help you understand this better, download L. Spiro's program, and then go to the tools menu, and click on the converter.
Now enter values in the boxes of the different data types, and as you do look at the "Hex" box, and you will see the 4 bytes being changed as you enter values for the other data types. For example if you enter 17 in the integer box, the hex box will show 11 00 00 00.
L. Spiro's program: http://www.memoryhacking.com/
Last edited by Turtle on Fri May 26, 2006 10:20 am; edited 4 times in total |
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pirateninja
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Joined: 20 Aug 2005
Posts: 10
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| Posted: Sat May 27, 2006 3:28 pm Post subject: |
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Well, using 4 as length is not working. It gives me an overflow error when trying to write a legit 4byte value into a length4 address, meaning that it's not big enough.
I rewrote my code. Can someone advise me on how I should modify this to support 4byte and Text vars? (This is all inside a module)
| Code: |
Private Const PROCESS_ALL_ACCESS As Long = &H1F0FFF
Private Declare Function GetWindowThreadProcessId Lib "user32" (ByVal hwnd As Long, lpdwProcessId As Long) As Long
Private Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Long, ByVal bInheritHandle As Long, ByVal dwProcessId As Long) As Long
Private Declare Function WriteProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function ReadProcessMemory Lib "kernel32" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, ByVal lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Private Declare Function CloseHandle Lib "kernel32" (ByVal hObject As Long) As Long
Private Declare Function FindWindow Lib "user32" Alias "FindWindowA" (ByVal Classname As String, ByVal WindowName As String) As Long
Private Declare Function ReadProcessMem Lib "kernel32" Alias "ReadProcessMemory" (ByVal hProcess As Long, ByVal lpBaseAddress As Any, ByRef lpBuffer As Any, ByVal nSize As Long, lpNumberOfBytesWritten As Long) As Long
Public Const rwBYTE = 1
Public Const rwINTEGER = 2
Public Const rwLONG = 4
Public Const rwDOUBLE = 8
Dim hwnd As Long
Dim ProcessID As Long
Dim ProcessHandle As Long
Public Function GetDecHexStr(ByVal xDecimal As Double) As String ''used for converting numbers into hex
Dim sReturnStr As String
Dim lQuotient As Long
iRemainder = xDecimal Mod 16
lQuotient = xDecimal \ 16
While lQuotient > 0
sReturnStr = sReturnStr + GetHexDigit(iRemainder)
xDecimal = lQuotient
iRemainder = xDecimal Mod 16
lQuotient = xDecimal \ 16
Wend
If iRemainder > 0 Then
sReturnStr = sReturnStr + GetHexDigit(iRemainder)
End If
GetDecHexStr = StrReverse(sReturnStr)
End Function
Public Function GetHexDigit(ByVal iDigit As Integer) As String ''used for converting hex into numbers
Dim sReturnStr As String
Select Case iDigit
Case "0", "1", "2", "3", "4", "5", "6", "7", "8", "9"
sReturnStr = CStr(iDigit)
Case "10"
sReturnStr = "A"
Case "11"
sReturnStr = "B"
Case "12"
sReturnStr = "C"
Case "13"
sReturnStr = "D"
Case "14"
sReturnStr = "E"
Case "15"
sReturnStr = "F"
End Select
GetHexDigit = sReturnStr
End Function
Public Function Init(WindowName As String) ''needs to be called on run, stores the vars needed for other functions
hwnd = FindWindow(vbNullString, WindowName)
If hwnd = 0 Then
MsgBox "Could not find process window!", vbCritical, "Error"
Exit Function
End If
End Function
Public Function ReadValue(Address As Long, Length As Byte) As String ''Returns value at Address with lengh of Length
Dim Value As String
GetWindowThreadProcessId hwnd, ProcessID
ProcessHandle = OpenProcess(PROCESS_ALL_ACCESS, False, ProcessID)
If ProcessHandle = 0 Then
MsgBox "Could not get a process handle!", vbCritical, "Read error"
Exit Function
End If
ReadProcessMem ProcessHandle, Address, Value, Length, 0&
ReadByte = Value
CloseHandle ProcessHandle
End Function
Public Function WriteValue(Adress As Long, Value As String, Length As Byte) As String ''Writes to the address Adress with length Legth and writes in it the value Value
GetWindowThreadProcessId hwnd, ProcessID
ProcessHandle = OpenProcess(PROCESS_ALL_ACCESS, False, ProcessID)
If ProcessHandle = 0 Then
MsgBox "Could not get a process handle!", vbCritical, "Write error"
Exit Function
End If
WriteProcessMem ProcessHandle, Address, Value, Length, 0&
CloseHandle ProcessHandle
End Function
Public Function PointerReadValue(Pointer As Long, Offset As Long, Length As Byte) As String ''Reads address from Pointer, adds it to Offset, returns value with length Length
Dim addr1 As Long
Dim addr2 As Long
Dim Value As Double
addr1 = ReadValue(Pointer, rwLONG)
addr2 = GetDecHexStr(Val(addr1) + Val(Offset))
Value = ReadValue(addr2, Length)
PointerReadValue = Value
End Function
Public Function PointerWriteValue(Pointer As Long, Offset As Long, Value As String, Length As Byte) As String ''Reads address from pointer, adds it to offset, stores value with length into pointervalue+offset.
Dim addr1 As Long
Dim addr2 As Long
addr1 = ReadValue(Pointer, rwLONG)
addr2 = GetDecHexStr(Val(addr1) + Val(Offset))
WriteValue addr2, Value, Length
End Function
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