C#

public class Win32Hook 
 
{ 
 
     [DllImport("kernel32")] 
 
     public static extern int GetCurrentThreadId(); 
 

 
     [DllImport( "user32", CharSet=CharSet.Auto,CallingConvention=CallingConvention.StdCall)] 
 
     public static extern int SetWindowsHookEx( HookType idHook, 
 
                    HOOKPROC lpfn, 
 
                    int hmod, 
 
                    int dwThreadId 
 
                    ); 
 

 
     public enum HookType 
 
     { 
 
          WH_KEYBOARD = 2 
 
     } 
 
     public delegate int HOOKPROC(int nCode, int wParam, int lParam); 
 

 
     private HOOKPROC hookProc; //private field with class scope 
 

 
     public void SetHook() 
 
     { 
 
           // set the keyboard hook 
 
          hookProc = new HOOKPROC(this.MyKeyboardProc); 
 

 
          SetWindowsHookEx(HookType.WH_KEYBOARD, hookProc, 0,
                    GetCurrentThreadId()); 
 

 
     } 
 

 
     public int MyKeyboardProc(int nCode, int wParam, int lParam) 
 
     { 
 
	  //line of code 

          return 0; 
 
     } 
 
}