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POReadProcessMemory keeps returning 0
 

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    <p>I'm currently developing a little hobby project to display health information in a game on my G15 keyboard through VB.NET.</p> <p>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.</p> <p>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).</p> <p>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.</p> <p>Here is the code I'm using to do it:</p> <p>API Call:</p> <pre><code>Private Declare Function ReadProcessMemory Lib "kernel32" ( _ ByVal hProcess As Integer, _ ByVal lpBaseAddress As Integer, _ ByRef lpBuffer As Single, _ ByVal nSize As Integer, _ ByRef lpNumberOfBytesWritten As Integer _ ) As Integer </code></pre> <p>Method:</p> <pre><code>Dim address As Integer address = &amp;HA90C62&amp; Dim valueinmemory As Integer Dim proc As Process = Process.GetCurrentProcess For Each proc In Process.GetProcesses If proc.MainWindowTitle = "3D Pinball for Windows - Space Cadet" Then If ReadProcessMemory(proc.Handle.ToInt32, address, valueinmemory, 4, 0) = 0 Then MsgBox("aww") Else MsgBox(CStr(valueinmemory)) End If End If Next Dim lastError As Integer lastError = Marshal.GetLastWin32Error() MessageBox.Show(CStr(lastError)) </code></pre> <p>Could somebody please explain to me why it is not working? Thanks in advance.</p>
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