OpenProcess And ReadProcessMemory?
Oct 4, 2009
I've been banging my head at a wall for like 4 hours now, googling and searching forums but I haven't found a solution yet. This is (a part) of the code: Public Declare Function OpenProcess Lib "Kernel32.dll" (ByVal dwDesiredAccess As Integer, ByVal bInheritHandle as Integer, ByVal dwProcId As Integer) As Integer
Public Declare Function ReadProcessMemory Lib "Kernel32.dll" (ByVal hProcess as IntPtr, ByVal lpBaseAddress As Integer, ByVal lpBuffer() As Byte, ByVal Size As Integer, ByRef BytesWritten As Integer) As String
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Aug 26, 2009
I'm having some problems implementing an algorithm to read a foreign process' memory. Here is the main code:
[Code]...
Although generally it seems to work correctly, the problem is that for some memory values ReadProcessMemory is returning false, and GetLastError is returning 299. From what I've googled, it seems to happen on vista because some params of OpenProcess were updated. Anyone knows what this is about? And what values should I try? Notice that as they changed, I wouldn't want to know if it's VM_READ or so, I want to know exactly what the values are.
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Jan 17, 2010
I was just wondering if anyone out there has experienced the same problem as i. I have tried using open process with ReadProcessMemory and have been getting the same darn return value back (OpenProcess return value = 373662154752) and i dont know why.I tried even changing the processID to a bogus value and i get the same handle back! i find that really weird and frusterating. Anyways here is a snipet of my code.
[Code]...
I also want to mention that i have tried changing the Access rights to PROCESS_ALL_ACCESS and received same damn value... Any help on getting it to work would be appreaciated. Also i am working under windows 7 X64(Bit) if that makes any difference.
P.S If you have questions to why im using these api functions, its to do with creating a program to save information from stored buffers of a flight simulation software at bombardier where i work. All software has been given to me in order to build this program.
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Nov 18, 2009
This time i have to read a string from a textbox on an other window (not one form in my project).I've got the correct address to that string memory, i can always get the correct
handle and process of the window, but i don't know how to use themwith ReadProcessMemory
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Sep 20, 2009
i wrote a programm that reads the memory of a program.it worked at xp and vista but not at windows 7 i builded it with microsoft visual basic 2008 express edition.the code looks like this:
Public Declare Function GetWindowThreadProcessId Lib "User32" (ByVal hwnd As Integer, ByRef lpdwProcessId As Integer) As Integer Public Declare Function OpenProcess Lib "kernel32" (ByVal dwDesiredAccess As Integer, ByVal bInheritHandle As Integer, ByVal dwProcessId As Integer) As Integer Public Declare Function ReadProcessMemory Lib "kernel32" Alias "ReadProcessMemory" (ByVal hProcess As Integer, ByVal lpBaseAddress As Integer, ByRef lpBuffer As Integer, ByVal nSize As Integer, ByRef lpNumberOfBytesWritten As Integer) As Integer
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Sep 7, 2009
I would like to know how you can get into a game using the ReadProcessMemory technique. Could someone help me by telling me what information I need to get into the game and the code required.
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Jun 24, 2009
This is again something work in VBA while VB2008 not working..I was about to use them to read lines from a listview of an external application...I define them as:
Private Declare Function WriteProcessMemory Lib "kernel32 " (ByVal hProcess As Int32, ByVal lpBaseAddress As Int32, ByRef lpBuffer As IntPtr, ByVal nSize As Int32, ByVal lpNumberOfBytesWritten As Int32) As Int32
Private Declare Function ReadProcessMemory Lib "kernel32 " (ByVal hProcess As Int32, ByVal lpBaseAddress As Int32, ByRef lpBuffer As IntPtr, ByVal nSize As Int32, ByVal lpNumberOfBytesWritten As Int32) As Int32
Originally, lpBuffer was defined as Any, while VB2008 not supporting it, so I make them IntPtr, then I got trouble when I use them..I declare a structure LV_ITEMA then dim myItem as new LV_ITEMA, so when I write:
WriteProcessMemory(pHandle, pMyItemMemory, myItem, Len(myItem), 0)
The program will give an error saying .. Error 1 Value of type 'WindowsApplication1.Module1.LV_ITEMA' cannot be converted to 'System.IntPtr'.
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Apr 12, 2009
let me show you my code first and then explain my problem.
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Dec 15, 2010
I've been using the readprocessmemory function to read some values from another program and it works just fine for small values. However when I'm trying to read something like 5000.123456789 or whatever it doesn't even display the 5000, it just displays something that seems kinda random. Now, I've had this problem before and it helped to just increase the iSize from 1 to 10, but now I can't increase it anymore for some reason. I tried to increase it to 100 but then I got a fatal error. Is there some way to get around this? I guess it could also be because I'm not trying to read an integer but a float, but there is no float in VB, so i tried double, but no go.
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Oct 19, 2010
I'm trying to get the Score of Pinball:
<DllImport("kernel32.dll", SetLastError:=True)> _
Public Function ReadProcessMemory( _
ByVal hProcess As IntPtr, _
ByVal lpBaseAddress As IntPtr, _
<Out()> ByVal lpBuffer() As Byte, _
ByVal dwSize As Integer, _
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Dec 6, 2008
I'm currently developing a little hobby project to display health information in a game on my G15 keyboard through VB.NET. When I use ReadProcessMemory via an API call, it keeps returning zero. The MSDN documentation referred me to use the Marshal.GetLastWin32Error() call to find out what is wrong and it returns 1400: INVALID WINDOW HANDLE.
I am now confused about whether the first argument of the function wants a window handle or a process id. Regardless, I have tried both with FindWindow and hardcoding the process id while the application is running (getting it from task manager). I have tried three different games, Urban Terror, Grand Theft Auto: SA and 3D pinball for windows, getting the memory addresses from an application called Cheat Engine; they all seem to fail. [Code]
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Jun 1, 2008
I have searched google with this error in relation to Process.MainModule.FileName however none link with the error message, "Only part of a ReadProcessMemory or WriteProcessMemory request was completed".There however was one thread on these forums suggest a 64 bit issue however that was soon excluded as it was reported also in a 32 bit enviroment. The marked answer to that thread suggested it is a security problem however I don't think anything has been changed in relation to that comapred to a 'clean' project.
"If it is a security problem, you may try to run your application under the debugger" Process.MainModule failure I am in-fact debugging this application through Visual Studio so I am not quite sure what to do next in the process of diagnosing this problem. I am debugging using 32 bit in a 64 bit enviroment because of DirectX compatability issues?
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