专注于产品开发平台解决方案

相关产品
相关方案
Qt使用TinyXML访问XML文件
分享：

版权声明：本文为CSDN博主「怎么追摩羯座」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。

原文链接：https://blog.csdn.net/Viciower/article/details/124848498


一、下载TinyXML

TinyXML download | http://SourceForge.net（链接：https://sourceforge.net/projects/tinyxml/）

新建个Qt工程，下载TinyXML，把压缩包中的tinystr.h、tinystr.cpp、tinyxml.h、tinyxml.cpp、tinyxmlerror.cpp、tinyxmlparser.cpp添加到工程中

二、几个类

    //文档类    TiXmlDocument* pDocument = new TiXmlDocument();
    //声明类    TiXmlDeclaration* pDeclaration = new TiXmlDeclaration("1.0","UTF-8","");
    pDocument->LinkEndChild(pDeclaration);
    //注释类    TiXmlComment* pComment = new TiXmlComment();
    pComment->SetValue("Person TinyXML" );
    pDocument->LinkEndChild(pComment);
    //元素类    TiXmlElement *pElement = new TiXmlElement("Person");
    pElement->SetAttribute("index", 0);    //属性    pDocument->LinkEndChild(pElement);
    //文本类    TiXmlText *pText = new TiXmlText("name");
    pElement->LinkEndChild(pText);
    //保存    pDocument->SaveFile("test.xml");

执行上面的代码生成如下的XML文件，第一行是声明；第二行是注释；

第三行是元素类，index是属性，name是文本

三、增加

void MainWindow::addData()
{
    TiXmlDocument* pDocument = new TiXmlDocument();
    if(pDocument->LoadFile(m_fileName.toStdString().c_str()))   //加载xml，test.xml存在时
    {
        //清空文件内容
        pDocument->Clear();
    }
    //声明类
    TiXmlDeclaration* pDeclaration = new TiXmlDeclaration("1.0","UTF-8","");
    pDocument->LinkEndChild(pDeclaration);
    //注释类
    TiXmlComment* pComment = new TiXmlComment();
    pComment->SetValue("Person TinyXML" );
    pDocument->LinkEndChild(pComment);
    //元素类
    TiXmlElement *pRootLv1 = new TiXmlElement("Person");    //创建一个根结点
    pDocument->LinkEndChild(pRootLv1);
    //添加老师
    addTeacher(pRootLv1);
    //添加学生
    addStudent(pRootLv1);
    //保存
    pDocument->SaveFile();
}
void MainWindow::addTeacher(TiXmlElement *pRoot)
{
    TiXmlElement *pRootLv1 = new TiXmlElement("Teachers");           //创建一个节点
    pRoot->LinkEndChild(pRootLv1);                                   //链接到节点pRoot下
    int index = 0;
    addTeacherData(pRootLv1, index, "赵老师", 28);
    index++;
    addTeacherData(pRootLv1, index, "王老师", 29);
}
void MainWindow::addTeacherData(TiXmlElement *pRoot, int index, QString name, int age)
{
    TiXmlElement *pRootLv1 = new TiXmlElement("Teacher");           //创建一个节点
    pRoot->LinkEndChild(pRootLv1);                                  //链接到节点pRoot下
    pRootLv1->SetAttribute("index", index);
    pRootLv1->SetAttribute("type", 0);
    TiXmlElement *pRootLv21 = new TiXmlElement("name");
    pRootLv1->LinkEndChild(pRootLv21);
    TiXmlText *pText1 = new TiXmlText(name.toStdString().c_str());
    pRootLv21->LinkEndChild(pText1);
    TiXmlElement *pRootLv22 = new TiXmlElement("age");
    pRootLv1->LinkEndChild(pRootLv22);
    TiXmlText *pText2 = new TiXmlText(QString::number(age).toStdString().c_str());
    pRootLv22->LinkEndChild(pText2);
}
void MainWindow::addStudent(TiXmlElement *pRoot)
{
    TiXmlElement *pRootLv1 = new TiXmlElement("Students");           //创建一个节点
    pRoot->LinkEndChild(pRootLv1);                                   //链接到节点pRoot下
    int index = 0;
    addStudentData(pRootLv1, index, "张三", 18, 90.1);
    index++;
    addStudentData(pRootLv1, index, "李四", 19, 89.5);
    index++;
    addStudentData(pRootLv1, index, "王五", 17, 93);
}
void MainWindow::addStudentData(TiXmlElement *pRoot, int index, QString name, int age, double score)
{
    TiXmlElement *pRootLv1 = new TiXmlElement("Student");           //创建一个节点
    pRoot->LinkEndChild(pRootLv1);                                  //链接到节点pRoot下
    pRootLv1->SetAttribute("index", index);
    pRootLv1->SetAttribute("type", 1);
    TiXmlElement *pRootLv21 = new TiXmlElement("name");
    pRootLv1->LinkEndChild(pRootLv21);
    TiXmlText *pText1 = new TiXmlText(name.toStdString().c_str());
    pRootLv21->LinkEndChild(pText1);
    TiXmlElement *pRootLv22 = new TiXmlElement("age");
    pRootLv1->LinkEndChild(pRootLv22);
    TiXmlText *pText2 = new TiXmlText(QString::number(age).toStdString().c_str());
    pRootLv22->LinkEndChild(pText2);
    TiXmlElement *pRootLv23 = new TiXmlElement("score");
    pRootLv1->LinkEndChild(pRootLv23);
    TiXmlText *pText3 = new TiXmlText(QString::number(score).toStdString().c_str());
    pRootLv23->LinkEndChild(pText3);
}

生成XML如下

四、遍历

void MainWindow::showData()
{
    TiXmlDocument* pDocument = new TiXmlDocument();
    if(!pDocument->LoadFile(m_fileName.toStdString().c_str()))   //加载xml，test.xml不存在时
    {
        qDebug() << pDocument->ErrorDesc();
        return;
    }
    //获取根节点值
    TiXmlElement* pRootLv1 = pDocument->RootElement();
    const char* elemValue = pRootLv1->Value();
    if(strcmp(elemValue, "Person") != 0)
    {
        qDebug() << "Person error";
        return;
    }
    for(TiXmlElement* pRootLv2 = pRootLv1->FirstChildElement();
             pRootLv2 != nullptr; pRootLv2 = pRootLv2->NextSiblingElement())
    {
        const char* elemValue = pRootLv2->Value();
        if(strcmp(elemValue, "Teachers") == 0)
        {
            for(TiXmlElement* pRootLv3 = pRootLv2->FirstChildElement();
                     pRootLv3 != nullptr; pRootLv3 = pRootLv3->NextSiblingElement())
            {
                elemValue = pRootLv3->Value();
                if(strcmp(elemValue, "Teacher") == 0)
                {
                    int index = 0;
                    //读取int属性用pRootLv4->QueryIntAttribute("属性名称", &value);
                    //读取double属性用pRootLv4->QueryDoubleAttribute("属性名称", &value);
                    //读取字符串属性用value = sublistElem->Attribute("属性名称");
                    pRootLv3->QueryIntAttribute("index", &index);
                    //读text
                    TiXmlElement* pRootLv4 = pRootLv3->FirstChildElement("name");
                    QString name = pRootLv4->FirstChild()->ToText()->Value();
                    pRootLv4 = pRootLv3->FirstChildElement("age");
                    QString ageStr = pRootLv4->FirstChild()->ToText()->Value();
                    int age = ageStr.toInt();
                    qDebug() << "编号：" << index << "  姓名：" << name << "  年龄：" << age;
                }
            }
        }
        else if(strcmp(elemValue, "Students") == 0)
        {
            for(TiXmlElement* pRootLv3 = pRootLv2->FirstChildElement();
                     pRootLv3 != nullptr; pRootLv3 = pRootLv3->NextSiblingElement())
            {
                elemValue = pRootLv3->Value();
                if(strcmp(elemValue, "Student") == 0)
                {
                    int index = 0;
                    pRootLv3->QueryIntAttribute("index", &index);
                    //读text
                    TiXmlElement* pRootLv4 = pRootLv3->FirstChildElement("name");
                    QString name = pRootLv4->FirstChild()->ToText()->Value();
                    pRootLv4 = pRootLv3->FirstChildElement("age");
                    QString ageStr = pRootLv4->FirstChild()->ToText()->Value();
                    int age = ageStr.toInt();
                    pRootLv4 = pRootLv3->FirstChildElement("score");
                    QString scoreStr = pRootLv4->FirstChild()->ToText()->Value();
                    double score = ageStr.toDouble();
                    qDebug() << "编号：" << index << "  姓名：" << name << "  年龄：" << age << "  成绩：" << score;
                }
            }
        }
    }
}

输出如下

五、修改

void MainWindow::changeData()
{
    QString nameC = "王老师";
    int ageC = 25;
    TiXmlDocument* pDocument = new TiXmlDocument();
    if(!pDocument->LoadFile(m_fileName.toStdString().c_str()))   //加载xml，test.xml不存在时
    {
        qDebug() << pDocument->ErrorDesc();
        return;
    }
    //获取根节点值
    TiXmlElement* pRootLv1 = pDocument->RootElement();
    const char* elemValue = pRootLv1->Value();
    if(strcmp(elemValue, "Person") != 0)
    {
        qDebug() << "Person error";
        return;
    }
    for(TiXmlElement* pRootLv2 = pRootLv1->FirstChildElement();
             pRootLv2 != nullptr; pRootLv2 = pRootLv2->NextSiblingElement())
    {
        const char* elemValue = pRootLv2->Value();
        if(strcmp(elemValue, "Teachers") == 0)
        {
            for(TiXmlElement* pRootLv3 = pRootLv2->FirstChildElement();
                     pRootLv3 != nullptr; pRootLv3 = pRootLv3->NextSiblingElement())
            {
                elemValue = pRootLv3->Value();
                if(strcmp(elemValue, "Teacher") == 0)
                {
                    //修改属性
//                    int index = 0;
//                    pRootLv3->SetAttribute("index", QString::number(index).toStdString().c_str());
                    TiXmlElement* pRootLv4 = pRootLv3->FirstChildElement("name");
                    QString name = pRootLv4->FirstChild()->ToText()->Value();
                    if(name == nameC)
                    {
                        //修改text
                        pRootLv4 = pRootLv3->FirstChildElement("age");
                        pRootLv4->FirstChild()->SetValue(QString::number(ageC).toStdString().c_str());
                    }
                }
            }
        }
    }
    pDocument->SaveFile();
}

王老师的age被更改为25

六、删除

void MainWindow::deleteData()
{
    QString nameC = "王老师";
    TiXmlDocument* pDocument = new TiXmlDocument();
    if(!pDocument->LoadFile(m_fileName.toStdString().c_str()))   //加载xml，test.xml不存在时
    {
        qDebug() << pDocument->ErrorDesc();
        return;
    }
    //获取根节点值
    TiXmlElement* pRootLv1 = pDocument->RootElement();
    const char* elemValue = pRootLv1->Value();
    if(strcmp(elemValue, "Person") != 0)
    {
        qDebug() << "Person error";
        return;
    }
    for(TiXmlElement* pRootLv2 = pRootLv1->FirstChildElement();
             pRootLv2 != nullptr; pRootLv2 = pRootLv2->NextSiblingElement())
    {
        const char* elemValue = pRootLv2->Value();
        if(strcmp(elemValue, "Teachers") == 0)
        {
            for(TiXmlElement* pRootLv3 = pRootLv2->FirstChildElement();
                     pRootLv3 != nullptr; pRootLv3 = pRootLv3->NextSiblingElement())
            {
                elemValue = pRootLv3->Value();
                if(strcmp(elemValue, "Teacher") == 0)
                {
                    TiXmlElement* pRootLv4 = pRootLv3->FirstChildElement("name");
                    QString name = pRootLv4->FirstChild()->ToText()->Value();
                    if(name == nameC)
                    {
                        //删除子节点
                        pRootLv2->RemoveChild(pRootLv3);
                    }
                }
            }
        }
    }
    pDocument->SaveFile();
}

王老师的信息被删除


行业痛点
解决方案
应用案例