win32发消息触发窗口拖动

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	::ReleaseCapture();
	::SendMessage(m_hWnd, WM_NCLBUTTONDOWN, HTCAPTION, NULL);
	::SendMessage(m_hWnd, WM_LBUTTONUP, NULL, NULL);

::ReleaseCapture(); ::SendMessage(m_hWnd, WM_NCLBUTTONDOWN, HTCAPTION, NULL); ::SendMessage(m_hWnd, WM_LBUTTONUP, NULL, NULL);