AfxRegisterWndClass是為了用自己的光標。
BOOL CBounceWnd::Create(LPCTSTR szTitle, LONG style, const RECT& rect, CWnd* parent)
{
// Register a custom WndClass and create a window.
// This must be done because CBounceWnd has a custom cursor, and
// no icon.
LPCTSTR lpszBounceClass =
AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW,
LoadCursor(NULL, IDC_UPARROW),
(HBRUSH)(COLOR_WINDOW+1),
NULL);
return CWnd::Create(lpszBounceClass, szTitle, style, rect, parent,
IDC_BOUNCE_WND);
}