passing OLE Control Obj as parameter to another OLE Control

Norman C. Byers -- nbyers@intxxnet.com
Monday, November 18, 1996

Environment: VC++ 4.2b, NT4.0=09

I've been having problems with the Media Architects (now going out of =
business...) ImageKnife control.
The component gallery generated class is call Cpicbuf. The Function I'm =
trying to call is called Assign(LPDISPATCH src). This essential takes =
one Cpicbuf and copies it to another. I've been passing  a =
Srcpicbuf.GetIDispatch() value. It's not working and returning a message =
that the Src LPDISPATCH does not represent a valid ImageKnife control.=20

The equivalent in VB is very simple, given 2 picbuf objects: DestPicbuf =
and SrcPicBuf:

DestPicbuf.Assign  SrcPicBuf

How do we duplicate the equivalent in C++ ? I've been searching thru =
MSDN and other CD's for what would  seem to be a simple answer.

---

Michael C. Hamilton -- mch@tiac.net
Tuesday, November 19, 1996

Norman Byers wrote:
> The component gallery generated class is call Cpicbuf. The Function
> I'm trying to call is called Assign(LPDISPATCH src). This essential
> takes one Cpicbuf and copies it to another. I've been passing  a
> Srcpicbuf.GetIDispatch() value. It's not working and returning a
> message that the Src LPDISPATCH does not represent a valid ImageKnife
> control.

I had the same problem with ImageKnife/OCX when I first started using
it.  The solution was to add the following function to the CPicbuf
class:

LPDISPATCH CPicbuf::GetLPDispatch()
{
  LPDISPATCH retDisp = NULL;
  IUnknown* pIUnknown = GetControlUnknown();
  if (pIUnknown != NULL)
    pIUnknown->QueryInterface(IID_IDispatch, (void**)&retDisp);

  return retDisp;
}

The Assign() function now becomes:
  m_DestPicbuf.Assign(0, m_SrcPicbuf.GetLPDispatch(), 0);

Good luck,
-Michael

---

Michael C. Hamilton -- mch@tiac.net
Tuesday, November 19, 1996

Norman Byers wrote:
> The component gallery generated class is call Cpicbuf. The Function
> I'm trying to call is called Assign(LPDISPATCH src). This essential
> takes one Cpicbuf and copies it to another. I've been passing  a
> Srcpicbuf.GetIDispatch() value. It's not working and returning a
> message that the Src LPDISPATCH does not represent a valid ImageKnife
> control.

I had the same problem with ImageKnife/OCX when I first started using
it.  The solution was to add the following function to the CPicbuf
class:

LPDISPATCH CPicbuf::GetLPDispatch()
{
  LPDISPATCH retDisp = NULL;
  IUnknown* pIUnknown = GetControlUnknown();
  if (pIUnknown != NULL)
    pIUnknown->QueryInterface(IID_IDispatch, (void**)&retDisp);

  return retDisp;
}

The Assign() function now becomes:
  m_DestPicbuf.Assign(0, m_SrcPicbuf.GetLPDispatch(), 0);

Good luck,
-Michael

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