VC ++ 6.0中的序列化问题 [英] Serialization problem in VC++ 6.0

问题描述

我有一个使用VC ++ 6.0语言设计的项目.我有一个讲CSplitDoc的类，它是从CDocument类派生的，该类具有n个其他类对象.

我确实为每个类都应用了序列化功能.每个类都有一些变量.这些变量值以加密格式存储在文本文件中.因此，每当我的应用程序启动时，我都可以打开保存的条件文件.

我的问题是，每当我在其他任何类中添加新变量时，VC ++序列化功能都无法使用...因此，我再次必须创建加密格式的文本文件...这非常耗时.

因此有人可以建议我解决此类问题的方法吗...尽快...

预先感谢U.

I am having a project which is designed in VC++ 6.0 language. I got one class say CSplitDoc which is derived from CDocument class, this class having n numbers of other classes object.

I did apply serialization functionality for each class. Each class having some variables.. these variables values are store in a encrypted format in a text file... So whenever my application will start i can open saved condition file.

My problem is that whenever I add a new variable in any other class then VC++ serialization functionality is not working... So again I have to create encrypted format text file... which is very much time consuming.

So can someone pls suggest me some solution for such problem... asap...

Thank U in advance.

推荐答案

请同时注意以下技巧:):

Please observe also the following technique :) :

// class CYourDocument : public CDocument

/*virtual*/ void CYourDocument::Serialize(CArchive& ar)
{
  static DWORD sdwVersion(2); // 2 = new member(s) = new version

  CDocument::Serialize(ar);

  if (ar.IsStoring()) {
    ar << sdwVersion;

    ar << m_ver1_member;
    ar << m_ver2_member;
  } else {
    ar >> sdwVersion;

    ar >> m_ver1_member;
    if (2 <= sdwVersion) {
      ar >> m_ver2_member;
    }
  }
}

P.S.也请记住
可以在默认构造函数中初始化您的新成员.

P.S. Please remember also
to initialize your new member(s) in the default constructor.

不幸的是，MFC序列化机制很脆弱(至少从版本化"的角度来看).您可以使用以下技巧:

Unfortunately the MFC serialization mechanism is fragile (at least from ''versioning'' standpoint). You may use this trick:

1. 仅更改 store方法.
2. 导入旧"归档文件.
3. 根据需要更新具有新功能的旧对象，对其进行序列化.
4. 现在也更改load方法.

1. Change only the store methods.
2. Import the ''old'' archive.
3. Update, if needed, the old objects with the new features, serialize them.
4. Now change the load methods too.

我知道，这很令人沮丧.

I know, is frustrating.

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