hooking another program's calls to winapi functions in vb.net

Question

I have been trying to build a game bot in vb.net. One of the main problems is getting access to the text the game prints on the screen so I have been trying to hook the games calls to the windows api drawtext and textout functions. I have been hunting for examples of how to set up a hook in vb.net for a long time without any luck. I have found it impossible to translate examples in old school vb, C++, and C#. For convenience's sake I would like to use the freely available deviare and/or easyhook libraries. Can anyone help?

Answer 1

easyhook libraries

Try to use the EasyHook library

Answer 2

I found working vb.net code based on the deviare hooking dlls buried in the deviare forums.

please remember to add all 6 deviare references found under the com tab of the add references page of visual studio after installing deviare.

Public Class Form1

'To print to a textbox in the gui you will have to call textbox.invoke

Private _mgr As Deviare.SpyMgr
Private WithEvents _hook As Deviare.Hook
Private _proc As DeviareTools.IProcess

Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

    _mgr = New Deviare.SpyMgr()
    _hook = _mgr.CreateHook("user32.dll!ShowWindow")
    _hook.Attach(_mgr.Processes)
    _hook.AddProcessFilter(0, "notepad", 1)
    _hook.Hook()

Private Sub OnFunctionCalled(ByVal proc As DeviareTools.IProcess, ByVal callInfo As DeviareParams.ICallInfo, ByVal rCall As Deviare.IRemoteCall) Handles _hook.OnFunctionCalled

Debug.Print("Caught function call in " & proc.Name) 'view in imediate window

End Sub

end class