if (HIWORD(wParam) == BN_CLICKED ||
HIWORD(wParam) == BN_DOUBLECLICKED) {
int n = SendDlgItemMessage (hwnd, 100, LB_GETCURSEL, 0, 0);
if (HIWORD(wParam) == BN_CLICKED ||
HIWORD(wParam) == BN_DOUBLECLICKED) {
int n = SendDlgItemMessage (hwnd, 100, LB_GETCURSEL, 0, 0);