更改XML文件中的属性字符串 [英] Change Attribute String in a XML file

问题描述

大家好，
我不是用MFC读/写XML文件的专家.我必须在XML文件中更改属性字符串.这是一个示例:

来自

Hi everyone,
I''m not very expert in reading / writing XML files with MFC. I must change an Attribute String in a XML file. Here is an example:

from

- <PropertyDescriptions>
-  <PropertyDescription PropertyName="Color" Value="Red" />
- 

到

to

...
Value="Green"
...

而不重写整个文件.我使用IXmlReader/IXmlWriter来读取/写入xml文件.有人可以向我解释(甚至带有示例)如何根据给定的属性名称更改单个值(在我的示例中为值")?

非常感谢

without rewrite the entire file. I use IXmlReader/IXmlWriter to read/write xml file. Someone could explain me (even with examples) how to change a single value given its attribute name (in my example "Value")?

Thanks a lot

推荐答案

这有点问题.

要将值从Red更改为Green，您实际上是在将数据长度更改2个字节(在Unicode文件中为4个字节).这意味着文件的其余部分将向下移动2个字符，从而需要重写文件的其余部分.您只能避免在更改值之前重写数据.

This is a bit of an issue.

To change the value from Red to Green you are actually changing the length of the data by 2 bytes (or 4 in a Unicode file). This means that the entire rest of the file is moved down by 2 characters, requiring the rest of the file to be rewritten. You can only avoid rewriting the data before the changed value.

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