Change Attribute String in a XML file

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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" />
-

to

...
Value="Green"
...

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

Posted 3-Feb-11 21:07pm

symreds

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Andrew Brock · Answer 1 · 2011-02-03T21:13:00

Solution 1

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.

Posted 3-Feb-11 21:13pm

Andrew Brock

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symreds 4-Feb-11 3:53am

Thank you Andrew