编辑QDomElement的值？ [英] Edit Value of a QDomElement?

问题描述

我需要编辑QDomElement的文本 - 例如

I need to edit the text of a QDomElement - Eg

我有一个XML文件，其内容为 -

I have an XML file with its content as -

<root>    
    <firstchild>Edit text here</firstchild>
</root>

如何编辑子元素的文本< firstchild> ？

How do I edit the text of the child element <firstchild>?

在Qt 4.7中提供的QDomDocument类描述的QDomElement中没有看到任何函数

I don't see any functions in the QDomElement of QDomDocument classes descriptions provided in Qt 4.7

Edit1 - 我要添加更多详细信息。

Edit1 - I am adding more details.

我需要读取，修改和保存xml文件。格式化文件如下 -

I need to read, modify and save an xml file. To format of the file is as below -

<root>    
    <firstchild>Edit text here</firstchild>
</root>

元素的值需要编辑。读取xml文件的代码是 -

The value of element needs to be edited.I code to read the xml file is -

QFile xmlFile(".\\iWantToEdit.xml");
xmlFile.open(QIODevice::ReadWrite);

QByteArray xmlData(xmlFile.readAll());

QDomDocument doc;
doc.setContent(xmlData);

//读取必要的值

/回写修改的值？

注意：我试图将QDomElement转换为QDomNode并使用函数setNodeValue但它不适用于QDomElement。

Note: I have tried to cast a QDomElement to QDomNode and use the function setNodeValue(). It however is not applicable to QDomElement.

我们非常欢迎任何建议，代码示例和链接。

Any suggestions, code samples, links would we greatly welcome.

推荐答案

p>这将做你想要的（你发布的代码将保持原样）：

This will do what you want (the code you posted will stay as is):

// Get element in question
QDomElement root = doc.documentElement();
QDomElement nodeTag = root.firstChildElement("firstchild");

// create a new node with a QDomText child
QDomElement newNodeTag = doc.createElement(QString("firstchild")); 
QDomText newNodeText = doc.createTextNode(QString("New Text"));
newNodeTag.appendChild(newNodeText);

// replace existing node with new node
root.replaceChild(newNodeTag, nodeTag);

// Write changes to same file
xmlFile.resize(0);
QTextStream stream;
stream.setDevice(&xmlFile);
doc.save(stream, 4);

xmlFile.close();

...你当然可以写一个不同的文件，以及。在这个例子中，我只是截断了现有文件并覆盖了它。

... and you are all set. You could of course write to a different file as well. In this example I just truncated the existing file and overwrote it.

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