Not able to properly Save OLE Storage to .docx format.

Question

Hi,
We have legacy C++ code that would embed word .doc files using OLE and save them back to .doc disk based files whenever necessary.
This code does not now work with .docx(.xlsx to that matter).
I am aware that old .doc files are Structured Storage files whereas the latest .docx are zipped xml files.
I am attaching code that would create an OLE storage out of .docx file and save it back to .docx.
When opening the saved .docx file, an error message pops in WinWord indicating that the file is corrupted and that it can repair that file. It works after word repairs the file. But Excel cannot even repair such .xlsx files.
Further, the saved OLE storages are well displayed in our application(in place editing for embedded files).
Can any one suggest what needs to be done?
the following is a sample code.
void CreateStorage()
HRESULT hr = S_OK;
WCHAR filePath[] = L"E:\\Sample.docx";
OleInitialize(NULL);
DWORD renderopt = OLERENDER_FORMAT;
FORMATETC formatEtc;
formatEtc.cfFormat = CF_ENHMETAFILE;
formatEtc.dwAspect = DVASPECT_CONTENT;
formatEtc.lindex = -1;
formatEtc.ptd = NULL;
formatEtc.tymed = TYMED_ENHMF;
LPSTORAGE m_pSrcStorage = NULL; // Pointer to the source storage
IOleObject *pObj = NULL;
ILockBytes *pLockBytes = NULL;
CLSID clsID;
hr = StgCreateStorageEx(NULL, STGM_READWRITE | STGM_CREATE | STGM_SHARE_EXCLUSIVE,
STGFMT_DOCFILE, 0, NULL, NULL, IID_IStorage, (void **)&m_pSrcStorage);
hr = OleCreateFromFile(CLSID_NULL, filePath, IID_IOleObject, renderopt,
&formatEtc, 0, m_pSrcStorage, (void**)&pObj);
IPersistStorage* pPersist = NULL;
hr = pObj->QueryInterface(IID_IPersistStorage, (void**)&pPersist);
if (pPersist != 0)
// Sample code to test OleSave. hr fails due to Access Denied
hr = OleSave(pPersist, m_pSrcStorage, FALSE);
pPersist->Release();
// Debugging code to know the CLSID of the document
pObj->GetUserClassID(&clsID);
unsigned long mytempdata = clsID.Data1;
LPSTORAGE pOleStorage = NULL;
hr = pObj->QueryInterface(IID_IStorage, (void**)&pOleStorage);
if (pOleStorage != NULL)
pOleStorage->Release();
WCHAR newFilePath[] = L"E:\\TestMe.docx";
DWORD STORAGE_OPEN_MODE = STGM_READWRITE | STGM_CREATE | STGM_DIRECT | STGM_SHARE_EXCLUSIVE;
LPSTORAGE pNewStorage = NULL;
hr = ::StgCreateStorageEx(newFilePath, STORAGE_OPEN_MODE, STGFMT_DOCFILE,
0, NULL, NULL, IID_IStorage, (void **)&pNewStorage);
hr = m_pSrcStorage->CopyTo(0, NULL, NULL, pNewStorage);
hr = pNewStorage->Commit(STGC_DEFAULT);
if (pLockBytes != NULL)
pLockBytes->Release();
pNewStorage->Release();
m_pSrcStorage->Release();
pObj->Release();
OleUninitialize();

Answer 1

Hi Phani,
As far as I know,only the Office 97-2003 binary file formats use the Windows Structured Storage APIs. Please refer to this KB article:
https://support.microsoft.com/kb/840817?wa=wsignin1.0
And the .docx file should be Office Open XML Formats which do not support Windows Structured Storage APIs.
If you want to manipulate .docx documents using Visual C++, please think about MS Office OLE Automation APIs.
http://www.codeproject.com/Articles/34998/MS-Office-OLE-Automation-Using-C
Also please check this : Sample code for creating a DOCX file. But these sample is written by C#.
http://blogs.msdn.com/b/brian_jones/archive/2006/06/29/651190.aspx
http://blogs.msdn.com/b/dmahugh/archive/2006/06/26/647859.aspx
Best regards,
Shu Hu
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