复合文档的问题

Question

在MFC程序中用COleDocument，然后发现每次保存文件后，用UntralEdit打开文件，文件的字节都在增长，这是为什么

void CDocTest3Doc::Serialize(CArchive& ar)
{
 if (ar.IsStoring())
 {
  // TODO: add storing code here
  ar<<m_str;
 }
 else
 {
  // TODO: add loading code here
  ar>>m_str;
 }

 // Calling the base class COleDocument enables serialization
 //  of the container document's COleClientItem objects.
 COleDocument::Serialize(ar);
}

Answer 1

因为COleDocument::Serialize(ar);创建的文件头不是写在文件开头，

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Answer 2

能去掉这种增量保存文件的属性吗,就像普通文件保存一样

Answer 3

呃，这个增量保存的行为是你的代码有bug造成的……写文件头信息的应该放在函数开头

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Answer 4

是先调用COleDocument::Serialize(ar); 然后再调用 if (ar.IsStoring()) { // TODO: add storing code here ar<<m_str; } else { // TODO: add loading code here ar>>m_str; }

Answer 5

是的

不过如果你启用了复合文件的话，应该只调用基类来保存COleClientItem

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Answer 6

还是不太理解，能否给个例子