添加子子项以提升ptree(Adding a sub child to boost ptree)

添加子子项以提升ptree(Adding a sub child to boost ptree)

让我们说我的目标是以下面的形式创建一个xml：

<main> <elements> <element name="elem1"><temp/> </element> <element name="elem2"><temp/> </element> </elements> </main>

我有以下代码：

ptree pt; pt.put("main",""); ptree temp1; temp1.put("element",""); temp1.put("element.<xmlattr>.name","elem1"); temp1.put("element.temp"); ptree temp2; temp2.put("element",""); temp2.put("element.<xmlattr>.name","elem2"); temp2.put("element.temp"); //temp1 represents the 1st <element>...</element> //temp2 represents the 1st <element>...</element> //Add temp1 and temp2 to <main> under <elements>

我认为以下方法可行：

pt.add_child("main.elements",temp1); pt.add_child("main.elements",temp2);

但是，这会生成以下xml：

<main> <elements> <element name="elem1"><temp/> </element> </elements> <elements> <element name="elem2"><temp/> </element> <elements> </main>

通过以下面的形式制作我的temp1，我能够获得所需的xml文件：

temp1.put("<xmlattr>.name","elem1"); temp1.put("temp",""); temp2.put("<xmlattr>.name","elem2"); temp2.put("temp",""); pt.add_child("main.elements.element",temp1); pt.add_child("main.elements.element",temp2);

有没有办法可以使用我的初始temp1和temp2节点来获得所需的xml结构？

Lets say I am aiming to create an xml in the following form:

<main> <elements> <element name="elem1"><temp/> </element> <element name="elem2"><temp/> </element> </elements> </main>

I have the following code:

ptree pt; pt.put("main",""); ptree temp1; temp1.put("element",""); temp1.put("element.<xmlattr>.name","elem1"); temp1.put("element.temp"); ptree temp2; temp2.put("element",""); temp2.put("element.<xmlattr>.name","elem2"); temp2.put("element.temp"); //temp1 represents the 1st <element>...</element> //temp2 represents the 1st <element>...</element> //Add temp1 and temp2 to <main> under <elements>

I would assume the following would work:

pt.add_child("main.elements",temp1); pt.add_child("main.elements",temp2);

However this generates the following xml:

<main> <elements> <element name="elem1"><temp/> </element> </elements> <elements> <element name="elem2"><temp/> </element> <elements> </main>

I was able to get the required xml file by making my temp1 in the following form:

temp1.put("<xmlattr>.name","elem1"); temp1.put("temp",""); temp2.put("<xmlattr>.name","elem2"); temp2.put("temp",""); pt.add_child("main.elements.element",temp1); pt.add_child("main.elements.element",temp2);

Is there a way I can work with my initial temp1 and temp2 nodes to get the desired xml structure?

最满意答案

你的情况有点不理想（我非常支持你给出的工作片段）。

这是什么工作：

pt.add_child("main.elements.element", temp1.get_child("element")); pt.add_child("main.elements.element", temp2.get_child("element"));

住在科利鲁

#include <boost/property_tree/xml_parser.hpp> #include <iostream> using boost::property_tree::ptree; int main() { ptree temp1; temp1.put("element.<xmlattr>.name","elem1"); temp1.put_child("element.temp", {}); ptree temp2; temp2.put("element.<xmlattr>.name","elem2"); temp2.put("element.temp", ""); //Add temp1 and temp2 to <main> under <elements> ptree pt; pt.add_child("main.elements.element", temp1.get_child("element")); pt.add_child("main.elements.element", temp2.get_child("element")); write_xml(std::cout, pt, boost::property_tree::xml_writer_make_settings<std::string>(' ', 4, "utf-8")); }

打印

<?xml version="1.0" encoding="utf-8"?>
<main>
    <elements>
        <element name="elem1">
            <temp/>
        </element>
        <element name="elem2">
            <temp/>
        </element>
    </elements>
</main>
Your situation is a bit suboptimal (and I'd very much favour the working snippet you gave).
 
Here's what would work:
 
pt.add_child("main.elements.element", temp1.get_child("element"));
pt.add_child("main.elements.element", temp2.get_child("element"));
 
Live On Coliru
 
#include <boost/property_tree/xml_parser.hpp>
#include <iostream>

using boost::property_tree::ptree;

int main() {
    ptree temp1;
    temp1.put("element.<xmlattr>.name","elem1");
    temp1.put_child("element.temp", {});

    ptree temp2;
    temp2.put("element.<xmlattr>.name","elem2");
    temp2.put("element.temp", "");

    //Add temp1 and temp2 to <main> under <elements>
    ptree pt;
    pt.add_child("main.elements.element", temp1.get_child("element"));
    pt.add_child("main.elements.element", temp2.get_child("element"));
    write_xml(std::cout, pt, boost::property_tree::xml_writer_make_settings<std::string>(' ', 4, "utf-8"));
}
 
Prints
 
<?xml version="1.0" encoding="utf-8"?>
<main>
    <elements>
        <element name="elem1">
            <temp/>
        </element>
        <element name="elem2">
            <temp/>
        </element>
    </elements>
</main>