Removing child node in a XML file C++

Question

I am using PugiXml library for XML related operations.

My XML File:

<CurrentStatus>
    <Time Stamp= "12:30">
        <price>100</price>
        <amount>1</amount>
    </Time>

    <Time Stamp= "14:50">
        <price>10</price>
        <amount>5</amount>
    </Time> 

    <Time Stamp= "16:30">
        <price>10</price>
        <amount>5</amount>
    </Time>     
</CurrentStatus>

For testing purpose, I am giving a hard-coded value that I want to delete the node Time with attribute Stamp = 14:50.

XML Node Removal Code: I used this SO Question as reference to remove a node (name = Time and Attribute = 14:50).

for (xml_node child = doc.child("CurrentStatus").first_child(); child; )
{
    xml_node next = child.next_sibling();       
    string attributeValue = child.attribute("Stamp").as_string();

    if (attributeValue == "14:50")
    {
        cout << "delete" << endl;
        child.parent().remove_child(child);
    }

    child = next;
}

Question: The above code runs without any error. It even enters into the if-statement but why the original XML file remains same after the execution?

PS: I am sure that the root node and the XML document is getting read properly in General since I am able to display the XML structure on the console.

Do you get an error while overwriting the XML file with the new content? — king_nak
– king_nak, Commented Oct 15, 2018 at 12:33

skm · Accepted Answer · 2018-10-15 12:38:01Z

0

I think that the problem was in Saving.

I executed the following save statement after the if-condition and it worked.

doc.save_file("D:/myfile.xml");

answered Oct 15, 2018 at 12:38

skm

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2 Comments

king_nak Over a year ago

That makes sense. You load a XML file into memory, modify the DOM in memory, and then have to write the new content from memory to the file. That's the common working principle. Changes to you data structures usually aren't automagically written back to the source

skm Over a year ago

@king_nak: Yes, since it was not mentioned in the documentation as well as in the SO answer so, I missed it.

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