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CRichEditCtrl and embedded graphics in a .rtf file


David E. Wach -- david@Clipper.Net
Friday, September 13, 1996


Environment: VC++ 4.0, Win 95, NT 3.51

I have a CRichEditCtrl in a dialog that I am reading .rtf files into 
using StreamIn.  I get all the text in with the proper formating no 
problem, but wherever I have a graphic (e.g. a metafile, or a bitmap) 
embedded in the .rtf, it doesn't show up in the CRichEditCtrl.  I've 
edited the .rtf file by hand to verify that the data is actually in the 
file.  Anybody else doing this sucessfully?  I'm tearing out my hair on 
this one...

Thanks!
-dave


beriksen@cda.com
Monday, September 16, 1996

     To my knowledge, the CRichEditCtrl only does text, not graphics.  This 
     is from experience and from something I read, though I can't remember 
     where I read it.  (I do know that if you cut from Word, say, a section 
     of a document that contains a bitmap or icon, what's pasted into the 
     CRichEditCtrl object is everything except the bmp.)
     
     Brian Eriksen
     CDA/Wiesenberger (a Thompson Financial Services company)
     beriksen@cda.com


______________________________ Reply Separator _________________________________
Subject: CRichEditCtrl and embedded graphics in a .rtf file
Author:  mfc-l@netcom.com at Internet_Mail
Date:    9/15/96 9:13 AM


     
Environment: VC++ 4.0, Win 95, NT 3.51
     
I have a CRichEditCtrl in a dialog that I am reading .rtf files into 
using StreamIn.  I get all the text in with the proper formating no 
problem, but wherever I have a graphic (e.g. a metafile, or a bitmap) 
embedded in the .rtf, it doesn't show up in the CRichEditCtrl.  I've 
edited the .rtf file by hand to verify that the data is actually in the 
file.  Anybody else doing this sucessfully?  I'm tearing out my hair on 
this one...
     
Thanks!
-dave


Roger Onslow/Newcastle/Computer Systems Australia/
Tuesday, September 17, 1996

[Mini-digest: 3 responses]

Wordpad uses a rich edit control in its view and supports OLE objects etc.
This support is provided by CRichEditDoc/CtnrItem/View classes
If you look at the source for these, you may be able to find out how to support 
this in plain vanilla CRichEditCtrl.
This may entail a bit of work :-)

Roger Onslow
-----From: Ed Ball 


Your best bet is to figure out how CRichEditView does it (see afxrich.h
and viewctrl.cpp), since CRichEditView (used by WordPad) uses the
CRichEditCtrl to do what it does. I imagine you'll have to provide an
OLE callback for the CRichEditCtrl::SetOleCallback function and
implement GetNewStorage, QueryInsertObject, etc., etc. Again, see the
MFC source (and possibly also the WordPad source) to see how they did
it...

- Ed
>
-----From: kyork@tgv.com (k.york)

This is a rather annoying and undocumented problem. It seems you need to
add some OLE stuff which I found somewhere but cannot remember at the
moment. Here are the gory details with sample source...

* derive your class from CRichEditCtrl (surprise)
* add members:
  DWORD          stgItem;       // these are use by OLE
  LPSTORAGE      pstg;
* in the header file, insert the stuff marked ``begin header insertion''
* in the source file, insert the stuff marked ``begin source insertion''
* in the constructor, add:
  pstg = OleStdCreateRootStorage(0, STGM_SHARE_EXCLUSIVE);
* in the destructor, add:
  pstg->Release(); // close & get rid of this file
* override OnCreate and add:
  SetOLECallback(&m_xRichEditOleCallback);

This should do it. All this work simply boils down to creating a storage
object which is needed for bitmaps and metafiles.
Apparently mickeysoft never really thought anyone would use these outside
of the CRichEditView/CRichEditDocument architecture.

Best O' Luck
--kyle

/********
  begin header insertion
  Note: insert this immediatly after the ``DECLARE_MESSAGE_MAP()''
statement
*********/
public:
 	BEGIN_INTERFACE_PART(RichEditOleCallback, IRichEditOleCallback)
		INIT_INTERFACE_PART(CRichEditView, RichEditOleCallback)
		STDMETHOD(GetNewStorage) (LPSTORAGE*);
		STDMETHOD(GetInPlaceContext) (LPOLEINPLACEFRAME*,
									  LPOLEINPLACEUIWINDOW*,
									  LPOLEINPLACEFRAMEINFO);
		STDMETHOD(ShowContainerUI) (BOOL);
		STDMETHOD(QueryInsertObject) (LPCLSID, LPSTORAGE, LONG);
		STDMETHOD(DeleteObject) (LPOLEOBJECT);
		STDMETHOD(QueryAcceptData) (LPDATAOBJECT, CLIPFORMAT*, DWORD,BOOL,
HGLOBAL);
		STDMETHOD(ContextSensitiveHelp) (BOOL);
		STDMETHOD(GetClipboardData) (CHARRANGE*, DWORD, LPDATAOBJECT*);
		STDMETHOD(GetDragDropEffect) (BOOL, DWORD, LPDWORD);
		STDMETHOD(GetContextMenu) (WORD, LPOLEOBJECT, CHARRANGE*, HMENU*);
	END_INTERFACE_PART(RichEditOleCallback)

	DECLARE_INTERFACE_MAP()
/***********
  begin source insertions
***********/
/********************************************************************
 **
 ** this is the minimal OLE interface necessary to allow
 ** display of bitmaps
 **
 ********************************************************************/


BEGIN_INTERFACE_MAP(CDerivedRichEditCtrl, CView)
	// we use IID_IUnknown because richedit doesn't define an IID
	INTERFACE_PART(CDerivedRichEditCtrl, IID_IUnknown, RichEditOleCallback)
END_INTERFACE_MAP()

STDMETHODIMP_(ULONG) CDerivedRichEditCtrl::XRichEditOleCallback::AddRef()
{
	METHOD_PROLOGUE_EX_(CDerivedRichEditCtrl, RichEditOleCallback)
	return (ULONG)pThis->ExternalAddRef();
}

STDMETHODIMP_(ULONG) CDerivedRichEditCtrl::XRichEditOleCallback::Release()
{
	METHOD_PROLOGUE_EX_(CDerivedRichEditCtrl, RichEditOleCallback)
	return (ULONG)pThis->ExternalRelease();
}

STDMETHODIMP CDerivedRichEditCtrl::XRichEditOleCallback::QueryInterface(
	REFIID iid, LPVOID* ppvObj)
{
	METHOD_PROLOGUE_EX_(CDerivedRichEditCtrl, RichEditOleCallback)
	return (HRESULT)pThis->ExternalQueryInterface(&iid, ppvObj);
}

STDMETHODIMP
CDerivedRichEditCtrl::XRichEditOleCallback::GetNewStorage(LPSTORAGE* ppstg)
{
	METHOD_PROLOGUE_EX_(CDerivedRichEditCtrl, RichEditOleCallback)
	SCODE sc = S_OK;
	WCHAR szItemW[OLEUI_CCHPATHMAX];
  char  szItem[OLEUI_CCHPATHMAX];


  wsprintf(szItem, "REOBJ%ld", pThis->stgItem);
  int ii;
  for (ii=0; szItem[ii]; ii++) 
    szItemW[ii] = szItem[ii];
  szItemW[ii] = 0;

	if(!(*ppstg = OleStdCreateChildStorage(pThis->pstg, szItemW)))
	{
		sc = E_FAIL;
	}
  return sc; //ResultFromScode(sc);
}

STDMETHODIMP CDerivedRichEditCtrl::XRichEditOleCallback::GetInPlaceContext(
	LPOLEINPLACEFRAME* lplpFrame, LPOLEINPLACEUIWINDOW* lplpDoc,
	LPOLEINPLACEFRAMEINFO lpFrameInfo)
{
	METHOD_PROLOGUE_EX(CDerivedRichEditCtrl, RichEditOleCallback)
  return ResultFromScode(E_NOTIMPL);
}

STDMETHODIMP
CDerivedRichEditCtrl::XRichEditOleCallback::ShowContainerUI(BOOL fShow)
{
	METHOD_PROLOGUE_EX(CDerivedRichEditCtrl, RichEditOleCallback)
  return ResultFromScode(E_NOTIMPL);
}

STDMETHODIMP CDerivedRichEditCtrl::XRichEditOleCallback::QueryInsertObject(
	LPCLSID /*lpclsid*/, LPSTORAGE /*pstg*/, LONG /*cp*/)
{
	METHOD_PROLOGUE_EX(CDerivedRichEditCtrl, RichEditOleCallback)
	return S_OK;
}

STDMETHODIMP
CDerivedRichEditCtrl::XRichEditOleCallback::DeleteObject(LPOLEOBJECT
/*lpoleobj*/)
{
	METHOD_PROLOGUE_EX_(CDerivedRichEditCtrl, RichEditOleCallback)
	return S_OK;
}

STDMETHODIMP CDerivedRichEditCtrl::XRichEditOleCallback::QueryAcceptData(
	LPDATAOBJECT lpdataobj, CLIPFORMAT* lpcfFormat, DWORD reco,
	BOOL fReally, HGLOBAL hMetaPict)
{
	METHOD_PROLOGUE_EX(CDerivedRichEditCtrl, RichEditOleCallback)
  return ResultFromScode(S_OK);
}

STDMETHODIMP
CDerivedRichEditCtrl::XRichEditOleCallback::ContextSensitiveHelp(BOOL
/*fEnterMode*/)
{
	return E_NOTIMPL;
}

STDMETHODIMP CDerivedRichEditCtrl::XRichEditOleCallback::GetClipboardData(
	CHARRANGE* lpchrg, DWORD reco, LPDATAOBJECT* lplpdataobj)
{
	METHOD_PROLOGUE_EX(CDerivedRichEditCtrl, RichEditOleCallback)
	return E_NOTIMPL;
}

STDMETHODIMP CDerivedRichEditCtrl::XRichEditOleCallback::GetDragDropEffect(
	BOOL fDrag, DWORD grfKeyState, LPDWORD pdwEffect)
{
	return E_NOTIMPL;
}

STDMETHODIMP CDerivedRichEditCtrl::XRichEditOleCallback::GetContextMenu(
	WORD seltype, LPOLEOBJECT lpoleobj, CHARRANGE* lpchrg,
	HMENU* lphmenu)
{
	return E_NOTIMPL;
}

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