为什么GetWindowRect（用mfc）不正确？

Question

窗体里有2个toolbar控件（一个在顶部，一个在底部），我想找出这两个控件的top、left属性：hwnd1=::FindWindowEx(hwnd,
   NULL,
   szCNameOfToolBar,
   NULL);//find first toolbar
hwnd2=::FindWindowEx(hwnd,
   hwnd1,
   szCNameOfToolBar,
   NULL);//find second toolbar
//控件的句柄已获取，且正确。LPRECT  lpPosOfButton1,lpPosOfButton2;
CWnd::FromHandle(hwnd2)->GetWindowRect(lpPosOfButton1);
CWnd::FromHandle(hwnd2)->GetWindowRect(lpPosOfButton2);但结果很奇怪：lpPosOfButton1,lpPosOfButton2的值都一样：0xcccccccc为什么？？？？？

Answer 1

更正：
CWnd::FromHandle(hwnd1)->GetWindowRect(lpPosOfButton1);CWnd::FromHandle(hwnd2)->GetWindowRect(lpPosOfButton2);但结果很奇怪：lpPosOfButton1,lpPosOfButton2的值都一样：0xcccccccc为什么？？？？？
难道获取不了top、left属性？？

Answer 2

RECT PosOfButton1,PosOfButton2;
CWnd::FromHandle(hwnd1)->GetWindowRect(&PosOfButton1);
CWnd::FromHandle(hwnd2)->GetWindowRect(&PosOfButton2);