使用 TinyXML 读取所有同级元素

Question

我在读取XML文件时有问题！下面的代码是为了从XML文件中获取儿童的价值观（国家），但是我需要浏览所有兄弟姐妹（所有三个国家），我将需要一个解决方案，这也可以与数量无限的兄弟姐妹一起使用。我的XML文件看起来像这样：

<?xml version="1.0"?>
<data>
    <country name ="Liechteinstein">
        <rank>1</rank>
        <year>2008</year>
        <gdppc>141100</gdppc>
        <neighbor name="Austria" direction="E"/>
        <neighbor name="Switzerland" direction="W"/>
    </country>
    <country name="Singapore">
        <rank>4</rank>
        <year>2011</year>
        <gdppc>59900</gdppc>
        <neighbor name="Malaysia" direction="N"/>
    </country>
    <country name="Panama">
        <rank>68</rank>
        <year>2011</year>
        <gdppc>13600</gdppc>
        <neighbor name="Costa Rica" direction="W"/>
        <neighbor name="Colombia" direction="E"/>
    </country>
</data>

我有这样的代码：

XMLDocument doc;
doc.LoadFile("test.xml");
tinyxml2::XMLElement* countryElement = doc.FirstChildElement("data")->FirstChildElement("country");

ofstream myfile;
myfile.open("result.txt", ios::out | ios::app );
    for (tinyxml2::XMLElement* child = countryElement->NextSiblingElement()->FirstChildElement(); child != NULL; child = child->NextSiblingElement())
    {
        myfile << child->GetText() << endl;
    }
    myfile.close();

这在第一个国家的所有值中都读取，但是我需要读写到txt文件的所有三个国家的价值。我尝试使用用于周期的兄弟姐妹添加

countryElement = countryElement->NextSiblingElement()在供周期结束时，但它不起作用。有人可以帮我吗？预先感谢！

Answer 1

我建议两个循环。一个循环穿越国家，一个循环遍历邻居：

int main() {
    tinyxml2::XMLDocument doc;
    doc.LoadFile("test.xml");
    tinyxml2::XMLElement* dataElement = doc.FirstChildElement("data");
    std::ofstream myfile;
    myfile.open("result.txt", std::ios::out | std::ios::app);
    for (tinyxml2::XMLElement* countryElement = dataElement->FirstChildElement("country");
        countryElement != NULL; countryElement = countryElement->NextSiblingElement())
    {
        myfile << "Country name: " << countryElement->Attribute("name") << std::endl;
        myfile << "Rank: " << countryElement->FirstChildElement("rank")->GetText() << std::endl;
        myfile << "Year: " << countryElement->FirstChildElement("year")->GetText() << std::endl;
        myfile << "gdppc: " << countryElement->FirstChildElement("gdppc")->GetText() << std::endl;
        for (tinyxml2::XMLElement* child = countryElement->FirstChildElement("neighbor");
            child != NULL; child = child->NextSiblingElement())
        {
            myfile << "Neighbor: " << child->Attribute("name") << std::endl;
        }
        myfile << std::endl;
    }
    myfile.close();
}

输出：

Country name: Liechteinstein
Rank: 1
Year: 2008
gdppc: 141100
Neighbor: Austria
Neighbor: Switzerland
Country name: Singapore
Rank: 4
Year: 2011
gdppc: 59900
Neighbor: Malaysia
Country name: Panama
Rank: 68
Year: 2011
gdppc: 13600
Neighbor: Costa Rica
Neighbor: Colombia