Hello:

i have the following situation:
1) a vc++ out-of-proc component that receives a idispatch pointer to a vb
com object residing in a vb dll.
2) the vc++ component does some work and then performs a callback into the
vb com object (via IDispatch::Invoke()).
3) when Invoke() is called, i get the error:
   - -2147024809 (The parameter is incorrect.)

note that the m_pSink->GetIDsOfNames() method succeedes. does anyone know
why this might be? below is the vb function as well as the vc++ calling
function.
thanks for any help and/or suggestions,
Ben

=======================================================
= VB FUNCTION...
=======================================================

Public Sub MyCallback(theResults As Variant)
    On Error GoTo errHandler

    MsgBox "RESULTS: " & theResults & ""
    Exit Sub

errHandler:
    MsgBox Error$(Err)
    Exit Sub
End Sub

=======================================================
= VC++ FUNCTION...
=======================================================

void
EventMarshaller::TriggerEvent
(
 BSTR bCallbackMethodName,
 VARIANT* vData
)
{
 //make sure that we have a registered sink object
 if (!m_pSink)
  return;

 m_Lock.Lock();

  OLECHAR FAR* szMember = bCallbackMethodName;
  DISPID dispid;

  //build up paraters to pass to Invoke() call
  VARIANTARG vArg;
  ::VariantInit(&vArg);
  vArg.vt = VT_VARIANT;
  vArg.pvarVal = vData;

  DISPPARAMS dispparams;
  dispparams.cArgs = 1;
  dispparams.rgvarg = &vArg;
  dispparams.cNamedArgs = 0;
  dispparams.rgdispidNamedArgs = NULL;

  //get the dispID for the function that we want to run on the passed
interface
  HRESULT hr;
  hr = m_pSink->GetIDsOfNames(IID_NULL, &szMember, 1, LOCALE_USER_DEFAULT,
&dispid);
  if (FAILED(hr))
   throw exception("Error, unable to retrieve dispid for EventCallback()
method on registered sink object.");

  //now invoke the task method on the passed interface
  hr = m_pSink->Invoke(
       dispid,
       IID_NULL,
       LOCALE_USER_DEFAULT,
       DISPATCH_METHOD,
       &dispparams, NULL, NULL, NULL);
  if (FAILED(hr))
   throw exception("Error, unable to call specified method on specified
callback object.");

 m_Lock.UnLock();
 return;
}

Benjamin Callister
Vice President of Engineering
Tutor.com
Real Tutors. Real Results.

e: bcallistertutor.com
p: 212.528.3101; x.227
w: http://www.tutor.com <http://www.tutor.com/>

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