FIX: ClassWizard Generates Incorrect UDN_DELTAPOS Handler

RESOLUTION

The generated handler function will look like this (assuming that the CSpinButtonCtrl is in a dialog):

  void CAboutDlg::OnDeltaposSpin1(NMHDR* pNMHDR, LRESULT* pResult)
      {
      NM_UPDOWN;
      // TODO: Add your control notification handler code here

      *pResult = 0;
      }
				

Modify the code to look like this:

  void CAboutDlg::OnDeltaposSpin1(NMHDR* pNMHDR, LRESULT* pResult)
      {
      NM_UPDOWN* pUpDown = (NM_UPDOWN*)pNMHDR;

      // TODO: Add your control notification handler code here

      *pResult = 0;
      }
				

By typecasting the pointer to the NMHDR structure, you can access additional data that is passed after the NMHDR.