Question

MFC鼠标点至窗口会显示窗口边缘程序

用定时器每隔一定时间显示边缘，我的程序如下
void CBDlg::OnTimer(UINT nIDEvent)
{
// TODO: Add your message handler code here and/or call default
POINT pnt;
RECT rc;
CDC* pdc=GetDC();

int oldRop2=pdc->SetROP2(10);

::GetCursorPos(&pnt);
HWND hwnd=::WindowFromPoint(pnt);
g_hWnd=hwnd;
::GetWindowRect(g_hWnd,&rc);

if(rc.left<0) rc.left=0;
if(rc.top<0) rc.top=0;

CPen *oldpen;
CPen newpen(0,3,RGB(125,0,125));
oldpen=(CPen*)pdc->SelectObject(&newpen);
pdc->Rectangle(&rc);
Sleep(400);
pdc->SetROP2(oldRop2);
pdc->SelectObject(oldpen);
CDialog::OnTimer(nIDEvent);
}
没财富了，谢谢帮忙

Answer 1

POINT point;
GetCursorPos(&point);//得到鼠标的位置
HWND m_hCurrentWindow=::WindowFromPoint(point);//返回包含了指定点的窗口的句柄。忽略屏蔽、隐藏以及透明窗口

while(::GetParent(m_hCurrentWindow))//这个循环是很关键的，因为鼠标可能指到一个窗口的子窗口上，如一个按钮
m_hCurrentWindow=::GetParent(m_hCurrentWindow);

CDC dc;
CPen *pOldPen;
CBrush *pOldBrush;
RECT rect;
dc.Attach(::GetWindowDC(m_hCurrentWindow));
CPen RectanglePen(PS_SOLID,5,COLORREF(0));
pOldPen=(CPen *)dc.SelectObject(&RectanglePen);
pOldBrush=(CBrush *)dc.SelectStockObject(HOLLOW_BRUSH);
::GetWindowRect(m_hCurrentWindow,&rect);
dc.Rectangle(0,0,rect.right-rect.left,rect.bottom-rect.top);
dc.SelectObject(pOldPen);
dc.SelectObject(pOldBrush);
dc.Detach();