how to create xml using boost property_tree

Question

i need to create xml for my output. I have a list of index names. i want to populate it in an xml file in one format.

that is

<response>
      <indexes>
          <index>abc</index>
          <index>xyz</index>
          <index>pqr</index>
      </indexes>
</response>

I have the list in my vector index_list.

Can any one help me out.

I have tried some code for that. which follows

boost::property_tree::ptree tree;
stringstream output;
for (std::vector<string>::const_iterator it = index_list.begin();
        it != index_list.end(); it++) {
    std::cout << *it << "\n";
    tree.put("response.indexes.index", *it);
}
if (format == "xml") {
    write_xml(output, tree);
} else {
    write_json(output, tree);
}

When i run the above code . i m getting only last name in the list. that is

<response>
  <indexes>
      <index>pqr</index>
  </indexes>
</response>

This works. I don't have any experience with this library so I don't know if it's the best way to do it. — user1252091
– user1252091, Commented Mar 14, 2013 at 16:07
thanks llonesmiz.. Your way of doing is also good.. impressed. — Vishnu Lal
– Vishnu Lal, Commented Mar 14, 2013 at 16:58

Community · Accepted Answer · 2017-05-23 11:50:08Z

1

The put method will erase any existing value, see the earlier question here that's related.

You'll have to use different keys for each entry in the list for your logic to avoid data loss.

Boost docs say

Calling put will insert a new value at specified path, so that a call to get specifying the same path will retrieve it.

edited May 23, 2017 at 11:50

CommunityBot

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answered Mar 14, 2013 at 15:35

Steve Townsend

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2 Comments

Vishnu Lal Over a year ago

thanks for your info. if i use put i cant get xml like <indexes><index/><index/></indexes>.. i will try add()..

Steve Townsend Over a year ago

My impression is that this is a feature of propertytree. XML is just used to represent the data structure, so don't expect to do everything with PTree that you can do in XML.

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