添加子树到boost :: property_tree元素

Question

我想要的是：

<tree>
    <objects>
        <object id="12345678">
            <AdditionalInfo>
                <Owner>Mr. Heik</Owner>
                <Health>37/100</Health>
            </AdditionalInfo>
        </object>
    </objects>
</tree>

我得到的是：

<tree>
    <objects>
        <object id="12345678"/>
        <AdditionalInfo>
            <Owner>Mr. Heik</Owner>
            <Health>37/100</Health>
        </AdditionalInfo>
    </objects>
</tree>

我试过的是：

using boost::property_tree::ptree;
ptree pt;
boost::property_tree::ptree nodeObject;
nodeObject.put("object.<xmlattr>.id", 12345678);

boost::property_tree::ptree nodeInfo;    
nodeInfo.put("Owner", "Mr. Heik");
nodeInfo.put("Health", "37/100");

// Put everything together
nodeObject.put_child("AdditionalInfo", nodeInfo);
pt.add_child("tree.objects", nodeObject);
write_xml("output.xml", pt);

我试图通过使用put / add / add_child / etc获得所需的结果。但没有成功。我必须使用哪些增强功能？

Answer 1

这行：

nodeObject.put("object.<xmlattr>.id", 12345678);

正在使用给定属性将新的子项添加到当前节点的子路径“对象”中。

只需在节点上设置属性：

nodeObject.put("<xmlattr>.id", 12345678);

并将节点直接添加到树中的正确路径：

pt.add_child("tree.objects.object", nodeObject);

最终代码：

ptree pt;
boost::property_tree::ptree nodeObject;
nodeObject.put("<xmlattr>.id", 12345678);

boost::property_tree::ptree nodeInfo;
nodeInfo.put("Owner", "Mr. Heik");
nodeInfo.put("Health", "37/100");

nodeObject.put_child("AdditionalInfo", nodeInfo);
pt.add_child("tree.objects.object", nodeObject);
write_xml("output.xml", pt);

输出：

<?xml version="1.0" encoding="utf-8"?>
<tree>
  <objects>
    <object id="12345678">
       <AdditionalInfo>
          <Owner>Mr. Heik</Owner>
          <Health>37/100</Health>
       </AdditionalInfo>
    </object>
  </objects>
</tree>