hook

[frix199]

hello!

do you know any good keyboard hook and how can i make it work?

i was stuck in one, so any suggestions would b appreciated...

tnx!!!

...and a happy new year...

[grilkip]

Can you be more specific?

ALT!!

[frix199]

mmm...yea...

i need a keyboard hook... you know, catching and sending keystrokes with another window active...

BUT, i cant make it work

so plz help

bibii

[jmcilhinney]

Found this using Google. That article explains how to implement a keyboard hook. For more specific information, perhaps you should tell us what you've done so far and what issues you are having.

[frix199]

i've seen that myself ...

BUT, i cant make it work!!!

1.i make the module
2.how i hook it?




tnxxx

[jmcilhinney]

That site has full source code. What more can we tell you? You've already been prompted twice for more information.

[frix199]

ok, ok

<MarshalAs(UnmanagedType.FunctionPtr)> _
Private callback As KeyboardHookDelegate
 
Public Sub HookKeyboard()
  callback = New KeyboardHookDelegate(AddressOf KeyboardCallback)
 
  KeyboardHandle = SetWindowsHookEx( _
    WH_KEYBOARD_LL, callback, _
    Marshal.GetHINSTANCE( _
    [Assembly].GetExecutingAssembly.GetModules()(0)).ToInt32, 0)
 
   Call CheckHooked()
  End Sub

i add the module, i use the fucntions to hook it as shown [url="http://www.developer.com/net/vb/article.php/10926_2193301_2"]here[/html], but i got this :

type 'marshalas' is not declared
type 'keyboardhookdelegate' is not declared
type 'keyboardhandle' is not declared

and for all the code...
its just like the module dissapeared...

[jmcilhinney]

Now we're getting somewhere. It's much easier to advise when the facts are known.

I pasted the code from that page into a code file and I got no such errors. The only errors I got were related to Option Strict and missing As clauses, which are easily fixed. It sounds to me like you've omitted sections of that code that are required. Here is the code from that page with several annotations relating to the issues you've mentioned.

Imports System.Runtime.InteropServices [COLOR=Red]<--- Required to use the MarshalAsAttribute class[/COLOR]
Imports System.Reflection
Imports System.Drawing
Imports System.Threading
 
Module Keyboard
    Public Declare Function UnhookWindowsHookEx Lib "user32" _
      (ByVal hHook As Integer) As Integer
 
    Public Declare Function SetWindowsHookEx Lib "user32" _
      Alias "SetWindowsHookExA" (ByVal idHook As Integer, _
      ByVal lpfn As KeyboardHookDelegate, ByVal hmod As Integer, _
      ByVal dwThreadId As Integer) As Integer
 
    Private Declare Function GetAsyncKeyState Lib "user32" _
      (ByVal vKey As Integer) As Integer
 
    Private Declare Function CallNextHookEx Lib "user32" _
      (ByVal hHook As Integer, _
      ByVal nCode As Integer, _
      ByVal wParam As Integer, _
      ByVal lParam As KBDLLHOOKSTRUCT) As Integer
 
    Public Structure KBDLLHOOKSTRUCT
        Public vkCode As Integer
        Public scanCode As Integer
        Public flags As Integer
        Public time As Integer
        Public dwExtraInfo As Integer
    End Structure
 
    ' Low-Level Keyboard Constants
    Private Const HC_ACTION As Integer = 0
    Private Const LLKHF_EXTENDED As Integer = &H1
    Private Const LLKHF_INJECTED As Integer = &H10
    Private Const LLKHF_ALTDOWN As Integer = &H20
    Private Const LLKHF_UP As Integer = &H80
 
    ' Virtual Keys
    Public Const VK_TAB = &H9
    Public Const VK_CONTROL = &H11
    Public Const VK_ESCAPE = &H1B
    Public Const VK_DELETE = &H2E
 
    Private Const WH_KEYBOARD_LL As Integer = 13&
    Public KeyboardHandle As Integer [COLOR=Red]<--- KeyboardHandle declared here.[/COLOR]
 
 
    ' Implement this function to block as many
    ' key combinations as you'd like
    Public Function IsHooked( _
      ByRef Hookstruct As KBDLLHOOKSTRUCT) As Boolean
 
        Debug.WriteLine("Hookstruct.vkCode: " & Hookstruct.vkCode)
        Debug.WriteLine(Hookstruct.vkCode = VK_ESCAPE)
        Debug.WriteLine(Hookstruct.vkCode = VK_TAB)
 
        If (Hookstruct.vkCode = VK_ESCAPE) And _
          CBool(GetAsyncKeyState(VK_CONTROL) _
          And &H8000) Then
 
            Call HookedState("Ctrl + Esc blocked")
            Return True
        End If
 
        If (Hookstruct.vkCode = VK_TAB) And _
          CBool(Hookstruct.flags And _
          LLKHF_ALTDOWN) Then
 
            Call HookedState("Alt + Tab blockd")
            Return True
        End If
 
        If (Hookstruct.vkCode = VK_ESCAPE) And _
          CBool(Hookstruct.flags And _
            LLKHF_ALTDOWN) Then
 
            Call HookedState("Alt + Escape blocked")
            Return True
        End If
 
        Return False
    End Function
 
    Private Sub HookedState(ByVal Text As String)
        Debug.WriteLine(Text)
    End Sub
 
    Public Function KeyboardCallback(ByVal Code As Integer, _
      ByVal wParam As Integer, _
      ByRef lParam As KBDLLHOOKSTRUCT) As Integer
 
        If (Code = HC_ACTION) Then
            Debug.WriteLine("Calling IsHooked")
 
            If (IsHooked(lParam)) Then
                Return 1
            End If
 
        End If
 
        Return CallNextHookEx(KeyboardHandle, _
          Code, wParam, lParam)
 
    End Function
 
 
    Public Delegate Function KeyboardHookDelegate( _
      ByVal Code As Integer, _
      ByVal wParam As Integer, ByRef lParam As KBDLLHOOKSTRUCT) _
                   As Integer [COLOR=Red]<--- KeyboardHookDelegate declared here.[/COLOR]
 
    <MarshalAs(UnmanagedType.FunctionPtr)> _
    Private callback As KeyboardHookDelegate
 
    Public Sub HookKeyboard()
        callback = New KeyboardHookDelegate(AddressOf KeyboardCallback)
 
        KeyboardHandle = SetWindowsHookEx( _
          WH_KEYBOARD_LL, callback, _
          Marshal.GetHINSTANCE( _
          [Assembly].GetExecutingAssembly.GetModules()(0)).ToInt32, 0)
 
        Call CheckHooked()
    End Sub
 
    Public Sub CheckHooked()
        If (Hooked()) Then
            Debug.WriteLine("Keyboard hooked")
        Else
            Debug.WriteLine("Keyboard hook failed: " & Err.LastDllError)
        End If
    End Sub
 
    Private Function Hooked()
        Hooked = KeyboardHandle <> 0
    End Function
 
    Public Sub UnhookKeyboard()
        If (Hooked()) Then
            Call UnhookWindowsHookEx(KeyboardHandle)
        End If
    End Sub
 
End Module

[frix199]

ok tnx but now everythings right exept "WH_KEYBOARD_LL" wich is not declared

[frix199]

o sh*t... im THAT stupid )

btw what do i enter instead this(all this cllbacks and things
):

SetWindowsHookEx( _
WH_KEYBOARD_LL, callback, _
Marshal.GetHINSTANCE( _
[Assembly].GetExecutingAssembly.GetModules()(0)).ToInt32, 0)