MFC圆角矩形窗口

思路：响应WM_SIZE消息，重设窗口rgn

代码：

void CIntercomeDlg::OnSize(UINT nType, int cx, int cy)
{
	CDialog::OnSize(nType, cx, cy);

	CRgn rgn;
	CRect rc;
	GetWindowRect(&rc);
	rc-=rc.TopLeft();
	rgn.CreateRoundRectRgn(rc.left,rc.top,rc.right,rc.bottom,30,30);
	SetWindowRgn(rgn,TRUE);
}