C++ CDocTemplate::MatchDocType方法代码示例

CDocument *CDocManager::OpenDocumentFile( LPCTSTR lpszFileName )
/**************************************************************/
{
    POSITION                    position = m_templateList.GetHeadPosition();
    CDocTemplate                *pSelected = NULL;
    CDocTemplate::Confidence    nSelConfidence = CDocTemplate::noAttempt;
    while( position != NULL ) {
        CDocTemplate *pTemplate = (CDocTemplate *)m_templateList.GetNext( position );
        ASSERT( pTemplate != NULL );
        
        CDocument                   *pMatch = NULL;
        CDocTemplate::Confidence    nConfidence = pTemplate->MatchDocType( lpszFileName,
                                                                           pMatch );
        if( nConfidence > nSelConfidence ) {
            nSelConfidence = nConfidence;
            pSelected = pTemplate;
            if( nConfidence == CDocTemplate::yesAlreadyOpen ) {
                ASSERT( pMatch != NULL );
                POSITION viewPos = pMatch->GetFirstViewPosition();
                if( viewPos != NULL ) {
                    CView *pView = pMatch->GetNextView( viewPos );
                    CFrameWnd *pFrame = pView->GetParentFrame();
                    ASSERT( pFrame != NULL );
                    pFrame->ActivateFrame();
                }
                return( pMatch );
            }
        }
    }
    if( pSelected == NULL ) {
        return( NULL );
    }
    return( pSelected->OpenDocumentFile( lpszFileName ) );
}

//////////////////
// This helper fn determines if I can open a document. It searches the doc
// templates for one whose file name extension matches the requested file.
// (copied from an article of MSJ magazine)
CDocTemplate* CExtractImageApp::CanOpenDocument(LPCTSTR lpszPath)
{
	CDocument* pDoc=NULL;
	POSITION pos = m_pDocManager->GetFirstDocTemplatePosition();
	while (pos != NULL) {
		CDocTemplate* pdt = m_pDocManager->GetNextDocTemplate(pos);
		if (pdt->MatchDocType(lpszPath,pDoc) >= CDocTemplate::yesAttemptNative)
			return pdt;
	}
	if (!pDoc) {
		// If you got here, you may have forgotten to set the string(s)
		// describing your document types
		//CString sErr; sErr.Format("***Can't find doc template for %s\n", lpszPath);
		//AfxMessageBox(sErr);
	}
	return NULL;
}

CDocument* COXChildFrameState::SearchDocument(LPCTSTR pszDocPath)
	// --- In  : pszDocPath : File path of a document
	// --- Out : 
	// --- Returns : The open document with that file path or NULL otherwise
	// --- Effect : 
	{
	if (pszDocPath == NULL)
		// ... Can only search for documents with a non-empty name
		return NULL;

	CDocument* pDoc = NULL;
	POSITION templatePos = NULL;
	CDocTemplate* pDocTemplate = NULL;
	templatePos = AfxGetApp()->GetFirstDocTemplatePosition();
	while((pDoc == NULL) && (templatePos != NULL))
		{
		pDocTemplate = AfxGetApp()->GetNextDocTemplate(templatePos);
		ASSERT(pDocTemplate != NULL);
		if (pDocTemplate->MatchDocType(pszDocPath, pDoc) != CDocTemplate::yesAlreadyOpen)
			pDoc = NULL;
		}

	return pDoc;
	}

CDocument* CMyDocManager::OpenDocumentFile(LPCTSTR lpszFileName)
{
	// From MFC: CDocManager::OpenDocumentFile

	CString strFileName = lpszFileName;

	strFileName.TrimLeft();
	strFileName.TrimRight();
	if (strFileName[0] == '\"')
		strFileName.Delete(0);
	int nPos = strFileName.ReverseFind('\"');
	if (nPos != -1)
		strFileName.Delete(nPos);

	CString strQuery, strPage;
	nPos = strFileName.Find('?');
	if (nPos != -1)
	{
		strQuery = strFileName.Mid(nPos + 1);
		strFileName = strFileName.Left(nPos);
	}

	bool bPathTooLong = false;
	TCHAR szPath[_MAX_PATH];
	if (!AfxFullPath(szPath, strFileName))
		bPathTooLong = true;

	if (bPathTooLong || !PathFileExists(szPath))
	{
		// Try extracting page number
		nPos = strFileName.ReverseFind('#');
		if (nPos != -1)
		{
			strPage = strFileName.Mid(nPos + 1);
			strFileName = strFileName.Left(nPos);

			if (!AfxFullPath(szPath, strFileName))
				bPathTooLong = true;
		}
	}

	if (bPathTooLong)
	{
		AfxMessageBox(FormatString(IDS_PATH_TOO_LONG, szPath), MB_ICONEXCLAMATION | MB_OK);
		return NULL;
	}

	TCHAR szLinkName[_MAX_PATH];
	if (AfxResolveShortcut(GetMainWnd(), szPath, szLinkName, _MAX_PATH))
		lstrcpy(szPath, szLinkName);

	// find the highest confidence
	CDocTemplate::Confidence bestMatch = CDocTemplate::noAttempt;
	CDocTemplate* pBestTemplate = NULL;
	CDocument* pOpenDocument = NULL;
	CMainFrame* pOldMainFrm = (CMainFrame*) theApp.m_pMainWnd;

	POSITION pos = m_templateList.GetHeadPosition();
	while (pos != NULL)
	{
		CDocTemplate* pTemplate = (CDocTemplate*)m_templateList.GetNext(pos);
		ASSERT_KINDOF(CDocTemplate, pTemplate);

		CDocTemplate::Confidence match;
		ASSERT(pOpenDocument == NULL);
		match = pTemplate->MatchDocType(szPath, pOpenDocument);
		if (match > bestMatch)
		{
			bestMatch = match;
			pBestTemplate = pTemplate;
		}
		if (match == CDocTemplate::yesAlreadyOpen)
			break;
	}

	if (pOpenDocument != NULL)
	{
		POSITION pos = pOpenDocument->GetFirstViewPosition();
		if (pos != NULL)
		{
			CView* pView = pOpenDocument->GetNextView(pos);
			ASSERT_VALID(pView);

			CMainFrame* pMainFrm = (CMainFrame*) pView->GetTopLevelFrame();
			pMainFrm->ActivateDocument(pOpenDocument);
		}
		else
			TRACE(_T("Error: Can not find a view for document to activate.\n"));
	}

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

		pOpenDocument = pBestTemplate->OpenDocumentFile(szPath);
	}
//.........这里部分代码省略.........