CODEWITHSUNDEEP
c++xmlboostboost-propertytree
gregory
gregory

Reputation: 211

no end of line in boost property tree xml writer output

Consider the following code using boost::property_tree:

#include <boost/property_tree/ptree.hpp>
#include <boost/property_tree/xml_parser.hpp>
using namespace boost::property_tree;

int main() {
    ptree model_tree;
    model_tree.add("calibrated", "true");
    model_tree.add("model.<xmlattr>.label", "label");
    model_tree.add("model.activity.<xmlattr>.type", "fixed");
    write_xml("test.xml", model_tree);
}

By compiling and executing the program I get the following output:

<?xml version="1.0" encoding="utf-8"?>
<calibrated>true</calibrated><model label="label"><activity type="fixed"/></model>

Which is not really what I expected, as there are no new lines nor indentation. I would like to get the following instead:

<?xml version="1.0" encoding="utf-8"?>
<calibrated>true</calibrated>
<model label="label">
    <activity type="fixed"/>
</model>

Is it a bug, or is there an option to obtain the latter output? Any help would be appreciated.

P.S.: I am using Ubuntu 12.04 LTS with gcc 4.6.3 and boost 1.48.

Upvotes: 8

Views: 4894

Answers (3)

Nikko
Nikko

Reputation: 4252

With (at least) boost 1.58, you can try this:

pt::write_xml( "test.xml", 
                model_tree,  
                std::locale(),
                pt::xml_writer_make_settings< std::string >( ' ', 4) );

Upvotes: 2

Vinoj John Hosan
Vinoj John Hosan

Reputation: 6893

Use settings while write_xml

settings Parameters

1.character indent
2:repeat times

boost::property_tree::xml_writer_settings<char> settings('\t', 1);
write_xml("xmlfilePath.xml", pt, std::locale(), settings);

Upvotes: 2

gregory
gregory

Reputation: 211

In the meantime I've found the answer. One should use xml_writer_settings, that is:

xml_writer_settings<char> settings(' ', 4);
write_xml("test.xml", model_tree, std::locale(), settings);

The first parameter in the constructor is the character used for indentation, whilst the second is the indentation length. As the solution is undocumented, hopefully this will help others facing similar problems.

Upvotes: 13

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