javascript - Invoke marshalled COM interface multiple times -

i writing com object javascript consumption. javascript code turn runs in hosted webbrowsercontrol. need fire events com object javascript, excellent guide @ dr. dobbs

e.g. have following in *.idl

ijscallback {     void listen(idispatch* pjsmethod); } 

javascript methods received idispatch* in c++ code, stored calling later, thread. no matter method marshaling used (comarshalinterthreadinterfaceinstream or iglobalinterfacetable) event firing thread able call javascript function once. after idispatch::invoke() returns e_accessdenied!

sample javascript code

var server = new activexobject("prog_id") var.listen(function(ip_add) {     // ip_add com object }); 

the c++ thread pretty straight forward.

// called javascript cmyobject::listen(idispatch* pjsmethod) {     // istream* m_pstream;     comarshalinterthreadinterfaceinstream(pjsmethod, iid_idispatch, &m_pstream); }  // called internal c++ thread. cmyobject::fireevent() {     // istream* m_pstream;     // idispatch* m_pjsmethod;     cogetinterfaceandreleasestream(m_pstream, iid_idispatch, (lpvoid*)&m_pjsmethod);      hsreult hr = m_pjsmethod->invoke(...); // hr = s_ok, call received in javascript     hr = m_pjsmethod->invoke(...); // hr = e_accessdenied, call not received in javascript } 

is expected behavior? or wrong in code?

fixed. mentioned in comments alert() works document.writeln() doesn't. because document.writeln() resets current document including scripts elements, use document.createelement(), document.createtextnode() , friends modify current loaded elements.

this common knowledge familiar html/javascript, rest of can real deal.