COM中的可连接对象与连接点机制及其MFC程序实现(7)

　　5.在按钮”连接”(IDC_CONNECT)的CLICK事件处理函数void CConnClientDlg::OnConnect()中写入:

void CConnClientDlg::OnConnect()

{

if(m_dwCookie!=0)

{

return;

}

if(m_pIUnknown!=NULL)

{

HRESULT hResult;

hResult = m_pIUnknown->QueryInterface(IID_IConnectionPointContainer,

(void**)&pConnPtCont);

if(FAILED(hResult))

{

::AfxMessageBox("不能获取对象的IConnectionPointContainer接口!");

return;

}

ASSERT(pConnPtCont!=NULL);

hResult = pConnPtCont->FindConnectionPoint(IID_IEventSink,&pConnPt);

if(FAILED(hResult))

{

pConnPtCont->Release();

::AfxMessageBox("不能获取对象的IEventSink连接点接口!");

return;

}