窗口抖动

void Move(){srand((unsigned)time(NULL));HWND hWnd = ::AfxGetMainWnd()->GetSafeHwnd();RECT rcOld, rcNew;::GetWindowRect(hWnd, &rcOld);::memcpy(&rcNew, &rcOld, sizeof(RECT));int iWidth = rcOld.right-rcOld.left;int iHeight = rcOld.bottom-rcOld.top;int x = 0, y = 0;for (int i =0; i<80; i++){x = rand()%60-30;y = rand()%60-30;::MoveWindow(hWnd, rcNew.left+x, rcNew.top+y, iWidth, iHeight, TRUE);}::MoveWindow(hWnd, rcOld.left, rcOld.top, iWidth, iHeight, TRUE);}