Making selective changes to XML file

ShakingBear

Hi,

I am currently having a task of making that requires making selective changes to some XML.

Lets say that the XML contains multiple elements with different tags A,B and C. I suppose to only make changes on the XML with tag B. There may be a modification / deletion / addition of the tag objects.

In other words

<A id ="pqr"/>
<B id="a"/>
<B id="1"/>
<B id="2"/>
<B id="3"/>

can become something like:

<A id ="pqr"/>
<B id="3"/>
<B id="jprs" name="somehtingOptional"/>

I don't have much control over the reader (its an old code and changing it means missing all my deadlines). We now want to selectively make changes for tag B w/o affecting everything else.
I tried using QXMLStreamWriter for this, but my implementation was basically truncate and re-write everything. Since I have no idea how tag A and C can be written (really old code and no one in the surviving team has any idea).
I have another implementation where I am basically duplicating the data which isn't tag B and just dump it into the file later. I don't like wasting space that way.
I tried using QDomDocument for doing this, but my setContent keeps returning false for some reason.

I am wondering if someone can suggest me something for this. I really don't want to duplicate data (double reading, memory wastage etc.).

Thanks

SGaist

Hi and welcome to devnet,

You can find the reason using the three last parameters of the setContent method.