SetWindowsHookEx, KeyboardProc and Non-static members

I am creating a keyboard hook, wherein KeyboardProc is a static member of a class CWidget.

class CWidget
{
   static LRESULT CALLBACK KeyboardProc(int code, WPARAM wParam, LPARAM lParam );

};

I want to call the non-static members of CWidget inside the CWidget::KeyboardProc.

What is the best way to do it?

KeyboardProc does not have any 32 bit DWORD where I can pass the 'this' pointer.

From stackoverflow

• Given that you probably only want one keyboard hook installed at a time, just add a static pThis member to your class:

  class CWidget
  {
      static HHOOK m_hHook;
      static CWidget *m_pThis;
  
  public:
      /* NOT static */
      bool SetKeyboardHook()
      {
          m_pThis = this;
          m_hHook = ::SetWindowsHookEx(WH_KEYBOARD, KeyboardProc, /* etc */);
      }
  
      // Trampoline
      static LRESULT CALLBACK KeyboardProc(int code, WPARAM wParam, LPARAM lParam)
      { return m_pThis->KeyboardProc(code, wParam, lParam); }
  
      LRESULT KeyboardProc(int code, WPARAM wParam, LPARAM lParam);
  
      /* etc. */
  };