private delegate int LowLevelKeyboardProc(int nCode,WindowsMessages wParam, [In] KBDLLHOOKSTRUCT lParam);

Private Delegate Function LowLevelKeyboardProc(ByVal nCode As Integer, ByVal wParam As WindowsMessages, <[In]> ByVal lParam As KBDLLHOOKSTRUCT) As Integer

KBDLLHOOKSTRUCT contains details of the key

static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, WM wParam, [In]KBDLLHOOKSTRUCT lParam);

Private Shared Function CallNextHookEx(ByVal hhk As IntPtr, ByVal nCode As Integer, ByVal wParam As WindowsMessages, <[In]()> ByRef lParam As KBDLLHOOKSTRUCT) As IntPtr

           lParam As KBDLLHOOKSTRUCT) As Long

WindowsMessages,KBDLLHOOKSTRUCT,MSLLHOOKSTRUCT

public class KBDLLHOOKSTRUCT

    public KBDLLHOOKSTRUCTFlags flags;

public enum KBDLLHOOKSTRUCTFlags : uint {

    KBDLLHOOKSTRUCT kbd = (KBDLLHOOKSTRUCT) Marshal.PtrToStructure(lParam, typeof(KBDLLHOOKSTRUCT));

    Public Structure KBDLLHOOKSTRUCT

        Public flags As KBDLLHOOKSTRUCTFlags

    Public Enum KBDLLHOOKSTRUCTFlags As UInt32

    Public Class KBDLLHOOKSTRUCT