DOCUMENT:Q220844 26-JUL-2002 [visualc] TITLE :HOWTO: Insert a Bitmap Into RTF Document Using RichEdit Control PRODUCT :Microsoft C Compiler PROD/VER::6.0 OPER/SYS: KEYWORDS:kbole kbActiveX kbBitmap kbCOMt kbCtrl kbMFC kbRichEdit kbVC600 kbGrpDSMFCATL ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - The Microsoft Foundation Classes (MFC), included with: - Microsoft Visual C++, 32-bit Enterprise Edition, version 6.0 - Microsoft Visual C++, 32-bit Professional Edition, version 6.0 - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 ------------------------------------------------------------------------------- SUMMARY ======= The RichEdit control does not provide a direct method for loading a bitmap and inserting it into an RTF document. The ActiveX control (RichTextBox) provides the Add method through the COleObjects class, but this action loads the bitmap for editing in the registered bitmap editor (usually Paintbrush) before inserting it into the document. Both the DLL and the OCX expose the IRichEditOle interface which, however, provides the InsertObject method. This requires a fully-populated RichEdit Object (REOBJECT) structure to be passed. MORE INFORMATION ================ The following code is based on a project in which the Microsoft RichText control has been inserted. With minor changes, it can apply to the RichEdit DLL as well. 1. Create a new MFC dialog based application named RichText. 2. In the dialog editor, add a RichEdit control to the application dialog resource. Use the code wizards to create a member variable, m_ctlRichText, of type CRichEditCtrl, that is associated with the new RichEdit control. 3. In the beginning of the InitInstance() method of the CWinApp derived class of your project, add a call to AfxInitRichEdit() to initialize the RichEdit common control. 4. Add four OLE interface pointers as member variables to the CDialog derived class: LPRICHEDITOLE m_pRichEditOle; LPOLEOBJECT m_lpObject; LPSTORAGE m_lpStorage; LPOLECLIENTSITE m_lpClientSite; NOTE: Set these variables to NULL in your constructor. You must include the header file Richole.h for the definition of the type LPRICHEDITOLE. 5. Get the IRichEditOLE interface early on in your program (in OnInitDialog or OnInitialUpdate) and keep it available. For the RichText control, use the following method: ::SendMessage(m_ctlRichText.m_hWnd, EM_GETOLEINTERFACE, 0, (LPARAM)&m_pRichEditOle); ASSERT(m_pRichEditOle != NULL); 6. To insert the bitmap, create an embedded object from a file. OLE provides the OleCreateFromFile function call to make this easier, but you still need to prepare for the call. The following code is an amalgam of techniques used within the MFC classes to provide similar functionality. BOOL CRichTextDlg::CreateFromFile(LPCTSTR lpszFileName) { USES_CONVERSION; ASSERT_VALID(this); ASSERT(m_lpObject == NULL); // one time only ASSERT(m_lpStorage == NULL); ASSERT(m_lpClientSite == NULL); LPLOCKBYTES lpLockBytes = NULL; CLSID clsid = CLSID_NULL; OLERENDER render = OLERENDER_DRAW; CLIPFORMAT cfFormat = 0; LPFORMATETC lpFormatEtc = NULL; SCODE sc; sc = ::CreateILockBytesOnHGlobal(NULL, TRUE, &lpLockBytes); if (sc != S_OK) AfxThrowOleException(sc); ASSERT(lpLockBytes != NULL); sc = ::StgCreateDocfileOnILockBytes(lpLockBytes, STGM_SHARE_EXCLUSIVE|STGM_CREATE|STGM_READWRITE, 0, &m_lpStorage); if (sc != S_OK) { VERIFY(lpLockBytes->Release() == 0); lpLockBytes = NULL; AfxThrowOleException(sc); } ASSERT(m_lpStorage != NULL); // fill in FORMATETC struct FORMATETC formatEtc; lpFormatEtc = &formatEtc; lpFormatEtc->cfFormat = cfFormat; lpFormatEtc->ptd = NULL; lpFormatEtc->dwAspect = DVASPECT_CONTENT; lpFormatEtc->lindex = -1; lpFormatEtc->tymed = TYMED_NULL; // attempt to create the object m_pRichEditOle->GetClientSite(&m_lpClientSite); sc = ::OleCreateFromFile(clsid, T2COLE(lpszFileName), IID_IUnknown, OLERENDER_DRAW, lpFormatEtc, m_lpClientSite, m_lpStorage, (void**)&m_lpObject); if (sc != S_OK) AfxThrowOleException(sc); // m_lpObject is currently an IUnknown, convert to IOleObject if (m_lpObject != NULL) { LPUNKNOWN lpUnk = m_lpObject; lpUnk->QueryInterface(IID_IOleObject, (void**)&m_lpObject); lpUnk->Release(); if (m_lpObject == NULL) AfxThrowOleException(E_OUTOFMEMORY); } // all items are "contained" -- this makes our reference to this object // weak -- which is needed for links to embedding silent update. OleSetContainedObject(m_lpObject, TRUE); ASSERT_VALID(this); return TRUE; } 7. To use the function, simply pass the full path to a bitmap as the file name parameter. The function creates a byte array in global memory and a compound file storage object in that memory. It then populates the FORMATETC structure, gets the client site, and creates the object within the provided storage. The result is an IUnknown pointer to the object that is then converted to a true IOleObject pointer by a call to QueryInterface. 8. Populate the RichEdit Object (REOBJECT) structure so it can call InsertObject through the IRichEditOle pointer stored earlier. The following code fills this structure: REOBJECT reobject; ZeroMemory(&reobject, sizeof(REOBJECT)); reobject.cbStruct = sizeof(REOBJECT); CLSID clsid; SCODE sc = m_lpObject->GetUserClassID(&clsid); if (sc != S_OK) AfxThrowOleException(sc); reobject.clsid = clsid; reobject.cp = REO_CP_SELECTION; reobject.dvaspect = DVASPECT_CONTENT; reobject.dwFlags = REO_RESIZABLE | REO_BELOWBASELINE; reobject.dwUser = 0; reobject.poleobj = m_lpObject; ASSERT(m_lpClientSite != NULL); reobject.polesite = m_lpClientSite; ASSERT(m_lpStorage != NULL); reobject.pstg = m_lpStorage; SIZEL sizel; sizel.cx = sizel.cy = 0; reobject.sizel = sizel; 9. At this point, make the InsertObject call. Insert the bitmap at the bottom of the file. A combination of EM_GETSEL/EM_SETSEL messages selects the document's text and positions the cursor at the end. HWND hWndRT = m_ctlRichText.m_hWnd; ::SendMessage(hWndRT, EM_SETSEL, 0, -1); DWORD dwStart, dwEnd; ::SendMessage(hWndRT, EM_GETSEL, (WPARAM)&dwStart, (LPARAM)&dwEnd); ::SendMessage(hWndRT, EM_SETSEL, dwEnd+1, dwEnd+1); 10. Call InsertObject but add a carriage return first as in the following sample: CString strCr = "\r\n"; m_ctlRichText. ReplaceSel(strCr,TRUE); Finally! m_pRichEditOle->InsertObject(&reobject); 11. The bitmap is dropped neatly at the bottom of the document with a carriage return separating it from the body of the text as in the following code sample: ::SendMessage(hWndRT, EM_SCROLLCARET, (WPARAM)0, (LPARAM)0); 12. This message scrolls the document to the caret position and the bitmap rolls into view. To repeat this, release the interface pointers: if (m_lpObject) { m_lpObject->Release(); m_lpObject = NULL; } if (m_lpStorage) { m_lpStorage->Release(); m_lpStorage = NULL; } if (m_lpClientSite) { m_lpClientSite->Release(); m_lpClientSite = NULL; } 13. Finally, release m_pRichEditOle. Additional query words: ====================================================================== Keywords : kbole kbActiveX kbBitmap kbCOMt kbCtrl kbMFC kbRichEdit kbVC600 kbGrpDSMFCATL Technology : kbAudDeveloper kbMFC Version : :6.0 Issue type : kbhowto ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. 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