ATL & DHTML

[Leesen]

I write an ATL control to implement the OnUnLoad event of the html. I set the OnUnload handle through IHTMLBodyElement. But it did not work. Source code as follow: //definition of IDHTMLTest2 in IDL interface IDHTMLTest2 : IDispatch { [id(1), helpstring("method ShowMsg")] HRESULT ShowMsg(); }; //selection of the source code CComPtrspIE; m_spClientSite->GetContainer(&spIE); CComQIPtrspDoc(spIE); if (spDoc){ CComPtr spElement; spDoc->get_body(&spElement); CComQIPtr spBody(spElement); IDispatch* pShowMsg; QueryInterface(IID_IDHTMLTest2,(void**)&pShowMsg); VARIANT v; v.vt=VT_DISPATCH; v.pdispVal=pShowMsg; //this event can't be invoke ,when close the ie-window spBody->put_onunload(v); //this invoke works well ((IDHTMLTest2*)pShowMsg)->ShowMsg(); //code below can works well // v.vt=VT_BSTR; // v.bstrVal = L"#DA70D6"; // spBody->put_bgColor(v); } Thank you for your advanced help. Regards.