FIX: Problem Occurs During File Open on Win32s

RESOLUTION

Derive a class from CDocManager and override the OpenDocumentFile function by copying the existing code and make some small changes. Because this fix is dependent on the internal MFC implementation, make sure you include the #if _MFC_VER == 0x400 statements.

Copy the following code into your application's .cpp file above the implementation of InitInstance. If you're looking at a paper copy of this article, note that you can find most of the code for OpenDocumentFile in Mfc\Src\Docmgr.cpp; rather than retyping the entire text, you could copy most of the code and make the change noted below:

#if _MFC_VER == 0x400

static inline BOOL IsDirSep(TCHAR ch)
{
    return (ch == _T('\\') || ch == _T('/'));
}

#ifndef _MAC
BOOL AFXAPI AfxResolveShortcut(CWnd* pWnd, LPCTSTR pszShortcutFile,
                                       LPTSTR pszPath, int cchPath);
#endif

#define _countof(array) (sizeof(array)/sizeof(array[0]))

BOOL AFXAPI AfxFullPath(LPTSTR lpszPathOut, LPCTSTR lpszFileIn);
void AFXAPI AfxGetRoot(LPCTSTR lpszPath, CString& strRoot);

class CMyDocManager : public CDocManager
{
public:
    CMyDocManager() {};
    virtual ~CMyDocManager() {};
    virtual CDocument* OpenDocumentFile(LPCTSTR lpszFileName);
};

CDocument* CMyDocManager::OpenDocumentFile(LPCTSTR lpszFileName)
{
    // find the highest confidence
    POSITION pos = m_templateList.GetHeadPosition();
    CDocTemplate::Confidence bestMatch = CDocTemplate::noAttempt;
    CDocTemplate* pBestTemplate = NULL;
    CDocument* pOpenDocument = NULL;

    TCHAR szPath[_MAX_PATH];
    ASSERT(lstrlen(lpszFileName) < _countof(szPath));
#ifndef _MAC
    TCHAR szTemp[_MAX_PATH];
    if (lpszFileName[0] == '\"')
        ++lpszFileName;
    lstrcpyn(szTemp, lpszFileName, _MAX_PATH);
    LPTSTR lpszLast = _tcsrchr(szTemp, '\"');
    if (lpszLast != NULL)
        *lpszLast = 0;
    AfxFullPath(szPath, szTemp);
    TCHAR szLinkName[_MAX_PATH];

    // CHANGE: check the windows version before calling AfxResolveShortcut
    if((BYTE)GetVersion() >=4 && AfxResolveShortcut(AfxGetMainWnd(),
                                 szPath, szLinkName,_MAX_PATH))
        lstrcpy(szPath, szLinkName);
#else
    lstrcpyn(szPath, lpszFileName, _MAX_PATH);
    WIN32_FIND_DATA fileData;
    HANDLE hFind = FindFirstFile(lpszFileName, &fileData);
    if (hFind != INVALID_HANDLE_VALUE)
        VERIFY(FindClose(hFind));
    else
        fileData.dwFileType = 0;    // won't match any type
#endif
    while (pos != NULL)
    {
        CDocTemplate* pTemplate =
                  (CDocTemplate*)m_templateList.GetNext(pos);
        ASSERT_KINDOF(CDocTemplate, pTemplate);

        CDocTemplate::Confidence match;
        ASSERT(pOpenDocument == NULL);
#ifndef _MAC
        match = pTemplate->MatchDocType(szPath, pOpenDocument);
#else
        match = pTemplate->MatchDocType(szPath,
                         fileData.dwFileType, pOpenDocument);
#endif
        if (match > bestMatch)
        {
            bestMatch = match;
            pBestTemplate = pTemplate;
        }
        if (match == CDocTemplate::yesAlreadyOpen)
            break;      // stop here
    }

    if (pOpenDocument != NULL)
    {
        POSITION pos = pOpenDocument->GetFirstViewPosition();
        if (pos != NULL)
        {
            CView* pView = pOpenDocument->GetNextView(pos);
            // get first one
            ASSERT_VALID(pView);
            CFrameWnd* pFrame = pView->GetParentFrame();
            if (pFrame != NULL)
                pFrame->ActivateFrame();
            else
                TRACE0(
                "Error: Cannot find frame for document to activate.\n");
            CFrameWnd* pAppFrame;
            if (pFrame !=
                    (pAppFrame = (CFrameWnd*)AfxGetApp()->m_pMainWnd))
            {
                ASSERT_KINDOF(CFrameWnd, pAppFrame);
                pAppFrame->ActivateFrame();
            }
        }
        else
        {
            TRACE0(
              "Error: Can not find view for document to activate.\n");
        }
        return pOpenDocument;
    }

    if (pBestTemplate == NULL)
    {
        AfxMessageBox(AFX_IDP_FAILED_TO_OPEN_DOC);
        return NULL;
    }

    return pBestTemplate->OpenDocumentFile(szPath);
}

#endif //mfc version 4.0 workaround
				

Now, include the following three lines to the first part of your MyApp::InitInstance function:

#if _MFC_VER == 0x400
    m_pDocManager = new CMyDocManager;
#endif