How to use CDocManager in CDocument OnSaveAs override ?

[Mike Pliam]

I have an SDI CRichEditView application with Doc/View architecture in which I have overridden the OnFileSave method in the CDocument class. I would like to use the CDocManager class to save the current document. After many hours of internet browsing and Visual Studio 2008 experimentation, I am turning to you in desparation.

I might add (without intending to mislead), that using the OnFileOpen method override presents no problem:

void CMyDoc::OnFileOpen()
{
	char fname[MAX_PATH];
	int length;
	length = GetModuleFileName(NULL, fname, 2048);
	PathRemoveFileSpec(fname);

	char szFilters[]= "All Files (*.*)|*.*||";

	CFileDialog fileDialog (TRUE, "*.*", "*.*",
      OFN_FILEMUSTEXIST| OFN_HIDEREADONLY | OFN_NOCHANGEDIR , szFilters, NULL);

	fileDialog.m_ofn.lpstrInitialDir = fname;

	if( fileDialog.DoModal ()==IDOK )
	{
		m_csPathname = fileDialog.GetPathName();
		m_csFilename = fileDialog.GetFileName();

		CDocManager * pDocMgr = (CDocManager *)AfxGetApp()->m_pDocManager;
		pDocMgr->OpenDocumentFile(m_csPathname);
		m_csTitle = m_csFilename;
		SetTitle(m_csTitle);
	}

}// OnFileOpen()

However, when I attempt to do something similar with OnFileSaveAs, I am unable to weave may way through the morass of documentation involving CDocManager and CArchive. The only progress that I have made is to discover that the CArchive::m_pDocument is NULL and I have not figured out how to set it to the current document. What follows below is one of many failed attempts:

void CMyDoc::OnFileSaveAs()
{
	char fname[MAX_PATH];
	int length;
	length = GetModuleFileName(NULL, fname, 2048);
	PathRemoveFileSpec(fname);

	char szFilters[]= "All Files (*.*)|*.*||";

	CFileDialog fileDialog (FALSE, "*.*", "*.*",
      OFN_FILEMUSTEXIST| OFN_HIDEREADONLY | OFN_NOCHANGEDIR , szFilters, NULL);

	fileDialog.m_ofn.lpstrInitialDir = fname;
	//fileDialog.m_ofn.lpstrInitialDir = m_csServerDir.GetBuffer(0); m_csServerDir.ReleaseBuffer();

	if( fileDialog.DoModal ()==IDOK )
	{
		m_csPathname = fileDialog.GetPathName();
		m_csFilename = fileDialog.GetFileName();

		CDocManager * pDocMgr = (CDocManager *)AfxGetApp()->m_pDocManager;
		//pDocMgr->OpenDocumentFile(m_csPathname);
		//pDocMgr->SaveAllModified();
		//pDocMgr->Serialize(CArchive &ar);
		//pDocMgr->GetNextDocTemplate(0);
		//CArchive ar;
		//CArchive ar(CFile *pFile, UINT nMode, int nBufSize = 4096, void *lpBuf = 0);
		//CArchive ar(const CArchive &arSrc);

		//BOOL ar.IsStoring();
		//POSITION pos = ar.m_pDocument->GetFirstViewPosition();
		//pDocMgr->GetNextDocTemplate(pos)
		//pDocMgr->Serialize(ar);

		// from: http://msdn.microsoft.com/en-us/library/kz2bk3c2(v=VS.80).aspx
		// The framework sets m_pDocument to the document being serialized when a user issues 
		// a File Open or Save command. If you serialize an Object Linking and Embedding (OLE) 
		// container document for reasons other than File Open or Save, you must explicitly set 
		// m_pDocument. For example, you would do this when serializing a container document to 
		// the Clipboard

		CFile myFile(m_csPathname, CFile::modeCreate | CFile::modeWrite);
		CArchive ar(&myFile, CArchive::store);

		//POSITION pos = ar.m_pDocument->GetFirstViewPosition(); // APPCRASH
		//pDocMgr->GetNextDocTemplate(pos);
		//ar.m_pDocument->GetNextView(pos);	// WHAT POSITION ?
		//ar.m_pDocument->SetModifiedFlag();
		//ar.m_pDocument->OnSaveDocument(LPCTSTR lpszPathName);
		//ar.m_pDocument->OnSaveDocument(m_csPathname);
		CMainFrame * pMain = (CMainFrame*)AfxGetMainWnd();
		CWinAESView * pView = (CWinAESView*)pMain->GetActiveView();
		//ar.m_pDocument->AddView(pView);
		//ar.m_pDocument->GetDocTemplate();

		if(ar.m_pDocument == NULL) MessageBox(NULL, "It's NULL!", "Save As", MB_OK);
		// Serialize the document to the archive.
		if (ar.m_pDocument != NULL)
			ar.m_pDocument->Serialize(ar);

		m_csTitle = m_csFilename;
		SetTitle(m_csTitle);
	}

}// OnFileSaveAs()

Note that the above method saves an empty file to the directory and that the m_pDocument is invariably NULL.

I am certain that there is a way to accomplish my task. Can anyone please help?