long m_Style;
m_Style=::GetWindowLong(this->m_hWnd,GWL_STYLE);
m_Style~=ws_ex_clientedge;
::SetWindowLong(this->m_hWnd,GWL_STYLE,m_Style);
m_Style=::GetWindowLong(this->m_hWnd,GWL_STYLE);
m_Style~=ws_ex_clientedge;
::SetWindowLong(this->m_hWnd,GWL_STYLE,m_Style);
m_Style&=~WS_EX_CLIENTEDGE
纯属笔误