C# Signature:

[DllImport("user32.dll")]
static extern int CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam,
   IntPtr lParam);

// overload for use with LowLevelKeyboardProc
[DllImport("user32.dll")]
static extern int CallNextHookEx(IntPtr hhk, int nCode, WindowsMessages wParam, [In]KBDLLHOOKSTRUCT lParam);

// overload for use with LowLevelMouseProc
[DllImport("user32.dll")]
static extern int CallNextHookEx(IntPtr hhk, int nCode, WindowsMessages wParam, [In]MSLLHOOKSTRUCT lParam);

VB Signature:

<DllImport("User32.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.StdCall)> _
Shared Function CallNextHookEx _
      (ByVal hhk As Integer, ByVal nCode As Integer, _
       ByVal wParam As IntPtr, ByVal lParam As IntPtr) As Integer
End Function

User-Defined Types:

WindowsMessages,KBDLLHOOKSTRUCT,MSLLHOOKSTRUCT

Notes:

hhk is ignored, so you can use IntPtr.Zero

Tips & Tricks:

Please add some!

Sample Code:

Please add some!

Alternative Managed API:

The ManagedWindowsApi project (http://mwinapi.sourceforge.net) provides a Hook class and subclasses for Journal hooks, Message hooks and Low-Level hooks.

CallNextHookEx on MSDN: http://msdn.microsoft.com/library/default.asp?url=/library/en-us/winui/winui/windowsuserinterface/windowing/hooks/hookreference/hookfunctions/callnexthookex.asp