使用QXmlStreamReader读取xml文件 [英] Reading a xml file using QXmlStreamReader
本文介绍了使用QXmlStreamReader读取xml文件的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想使用QXmlStreamReader读取一个xml文件,但我真的不知道在哪里的问题,我的函数读取的第一个标签的内容,然后它停止
的形式的xml文件:
<?xml version =1.0encoding =utf-8?
< student>
< firstName> mina< / firstName>
< lastName> jina< / lastName>
< grade> 13< / grade>
< / student>
< student>
< firstName> Cina< / firstName>
< lastName> fina< / lastName>
< grade> 13< / grade>
< / student>
功能:
void MainWindow :: open(){
QFile file(QFileDialog :: getOpenFileName(this,Open));
if(file.open(QIODevice :: ReadOnly)){
QXmlStreamReader xmlReader;
xmlReader.setDevice(& file);
QList< Student>学生们;
xmlReader.readNext();
//从文件读取
while(!xmlReader.isEndDocument())
{
if(xmlReader.isStartElement())
{
QString name = xmlReader.name()。toString();
if(name ==firstName|| name ==lastName||
name ==grade)
{
QMessageBox :: information ,xmlReader.readElementText());
}
} else if(xmlReader.isEndElement())
{
xmlReader.readNext();
}
}
if(xmlReader.hasError())
{
std :: cout< XML error:< xmlReader.errorString()。data()<< std :: endl;
}
}
}
解决方案>
问题是以xml文档的形式,我需要创建一个根标签所以新的形式的文档是:
<?xml version =1.0encoding =utf-8?>
< students>
< Student>
< firstName> mina< / firstName>
< lastName> jina< / lastName>
< grade> 13< / grade>
< / student>
< student>
< firstName> Cina< / firstName>
< lastName> fina< / lastName>
< grade> 13< / grade>
< / student>
< / students>
i want to read a xml file using QXmlStreamReader but i really don't know where is the problem, my function reads the content of the first tag, then it stops the form of the xml file :
<?xml version="1.0" encoding="utf-8"?>
<student>
<firstName>mina</firstName>
<lastName>jina</lastName>
<grade>13</grade>
</student>
<student>
<firstName>Cina</firstName>
<lastName>fina</lastName>
<grade>13</grade>
</student>
the function :
void MainWindow::open() {
QFile file(QFileDialog::getOpenFileName(this,"Open"));
if(file.open(QIODevice::ReadOnly)) {
QXmlStreamReader xmlReader;
xmlReader.setDevice(&file);
QList<Student> students;
xmlReader.readNext();
//Reading from the file
while (!xmlReader.isEndDocument())
{
if (xmlReader.isStartElement())
{
QString name = xmlReader.name().toString();
if (name == "firstName" || name == "lastName" ||
name == "grade")
{
QMessageBox::information(this,name,xmlReader.readElementText());
}
}else if (xmlReader.isEndElement())
{
xmlReader.readNext();
}
}
if (xmlReader.hasError())
{
std::cout << "XML error: " << xmlReader.errorString().data() << std::endl;
}
}
}
解决方案
the problem was in the form of the xml document , i needed to create a root tag So the new form of the document is :
<?xml version="1.0" encoding="utf-8"?>
<students>
<student>
<firstName>mina</firstName>
<lastName>jina</lastName>
<grade>13</grade>
</student>
<student>
<firstName>Cina</firstName>
<lastName>fina</lastName>
<grade>13</grade>
</student>
</students>
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