HOWTO: ????? ?????? ??????? ??? ?????? ??? ??? ????? MFC

????? ???? ?????

1. ????? ????? ???? ????? ???? ????? ??? ????? ?????? ???????. ??? ????? ?????? ????? ??? ??? filterExt ?????? ?????? ?????? (??? ???? ??????? .aaa; .bbb). ?? ???? ?????? ???? ??????? ???? ???????:

      \nExts\nExts\nFiles (*.aaa; *.bbb)\n.aaa;.bbb\nExts.Doc\nExts Doc.
   					

2. ?????? ??? ?? CMultiDocTemplate ??????? MDI ?? CSingleDocTemplate ????????? SDI. ????? ??? ????? ??? ??????? ?? ?????? ??? ????? ????? ??????? ?? ????? ?? InitInstance ??????. ?????? ??? ????? ????? ?????? ??????? ???? ??? ??????.

      CMyMultiDocTemplate::CMyMultiDocTemplate(
         UINT nIDResource, CRuntimeClass* pDocClass,
         CRuntimeClass* pFrameClass, CRuntimeClass* pViewClass ) :
         CMultiDocTemplate(nIDResource, pDocClass, pFrameClass, pViewClass)
         { };
   					

3. ????? ???? GetDocString ?? ????? ??????? ????? ?? CMultiDocTemplate ?? CSingleDocTemplate ?? ?????? 2.

      BOOL CMyMultiDocTemplate::GetDocString(CString& rString,
                               enum DocStringIndex i) const
      {
           CString strTemp,strLeft,strRight;
           int nFindPos;
           AfxExtractSubString(strTemp, m_strDocStrings, (int)i);
   
           if(i == CDocTemplate::filterExt)  {
             nFindPos=strTemp.Find(';');
             if(-1 != nFindPos) {
               //string contains two extensions
               strLeft=strTemp.Left(nFindPos+1);
               strRight=strTemp.Right(lstrlen((const
               char*)strTemp)-nFindPos-1);
               strTemp=strLeft+strRight;
             }
           }
       rString = strTemp;
       return TRUE;
      }
   					

4. ????? CMyMultiDocTemplate::MatchDocType ???? ??? ?????? ??? ??? ?????? ??????? ??? ??? ???.

      CDocTemplate::Confidence CMyMultiDocTemplate::MatchDocType(const
           char* pszPathName, CDocument*& rpDocMatch)
      {
           ASSERT(pszPathName != NULL);
           rpDocMatch = NULL;
   
           // go through all documents
           POSITION pos = GetFirstDocPosition();
           while (pos != NULL)
           {
              CDocument* pDoc = GetNextDoc(pos);
              if (pDoc->GetPathName() == pszPathName) {
                 // already open
                 rpDocMatch = pDoc;
                 return yesAlreadyOpen;
              }
           }  // end while
   
           // see if it matches either suffix
           CString strFilterExt;
           if (GetDocString(strFilterExt, CDocTemplate::filterExt) &&
             !strFilterExt.IsEmpty())
           {
              // see if extension matches
              ASSERT(strFilterExt[0] == '.');
              CString ext1,ext2;
              int nDot = CString(pszPathName).ReverseFind('.');
              const char* pszDot = nDot < 0 ? NULL : pszPathName + nDot;
   
              int nSemi = strFilterExt.Find(';');
              if(-1 != nSemi)   {
                // string contains two extensions
                ext1=strFilterExt.Left(nSemi);
                ext2=strFilterExt.Mid(nSemi+2);
                // check for a match against either extension
                if (nDot >= 0 && (lstrcmpi(pszPathName+nDot, ext1) == 0
                    || lstrcmpi(pszPathName+nDot,ext2) ==0))
                  return yesAttemptNative; // extension matches
              }
              else
              { // string contains a single extension
                if (nDot >= 0 && (lstrcmpi(pszPathName+nDot,
                    strFilterExt)==0))
                return yesAttemptNative;  // extension matches
              }
           }
           return yesAttemptForeign; //unknown document type
      }
   					

5. ???? ??? ? ??? ???? ?????? ???? ???? ?? DoSave ????? ???? ?? ????? ??????? ?????? CDocument. ???? ?????? ?? MFC ?????? CDocument::DoSave() ?? Mfc\Src\Doccore.cpp ????? ?? ??? ?????.
   
   ??????? ??? ??????:

           // append the default suffix if there is one
           CString strExt;
           if (pTemplate->GetDocString(strExt, CDocTemplate::filterExt) &&
               !strExt.IsEmpty())
           {
              ASSERT(strExt[0] == '.');
              newName += strExt;
           }
   						

   ?? ??? ??????:

           // append the default suffix if there is one
           CString strExt;
           if (pTemplate->GetDocString(strExt, CDocTemplate::filterExt) &&
               !strExt.IsEmpty())
           {
             ASSERT(strExt[0] == '.');
   
             int nSemi;                       //added
             if(nSemi = strExt.Find(';'));    //added
             strExt = strExt.Left(nSemi);     //added
   
             newName += strExt;
           }
   						

   ????? ????? ???? ????????? ???????? ?????? ???? ????? ???? ??????? ??? "??? ????" ?????? ??? ????? ???? ????? ??? ????? ???????? ??????? ?? ????? ??????? ????? ??. ???? ????? ???????? ??? ??? ?????? ??? ??? ??? ?????? ???? ????? ?????? ??????? ?? ????? ???????.
   
   ?????? ????? ??? ??????? ???? ????????? ???????? ???????:

         CATCH_ALL(e)
         {
         TRACE0("Warning: failed to delete file after failed SaveAs.\n");
         DELETE_EXCEPTION(e);
         }
   						

   ??:

         CATCH_ALL(e)
         {
         TRACE0("Warning: failed to delete file after failed SaveAs.\n");
         e->Delete();     //modified
         }
   						

   ??? ?????? ???? ??? ??? ????? ??????? DELETE_EXCEPTION() ?? ??? ??????.
6. (??????? 16 ?? ???) ??????? "????? ???" ?????? ??????? ????? OnFileSave ? OnFileSaveAs ?? ??? ????? ?? ???????. ??? ??? ??????? ??? ?? ????????? 16-?? ?? Visual C++ ? DoSave ?????? ??? ?????. ?????? ?? ???? ??????? ????????? ??? ?????? ?? ??????? ??? ?? Mfc\Src\Doccore.cpp ??? ??????? ?????. ??????? ??????? ?????? ?????? ??????? ?? DoSave ????? ?? ??????? ??? ??????. ?? ???? ??????? ?????? # ????? "io.h" ??? ??????? ?????? ????? ?????? _access.

???? ??? ?????? | ????? ???????