QT读取xml文件，然后写入另外一个新的xml文件

 一个简单方法,

简单来说，读一个xml文件，然后对某些节点进行修改（本例子没有修改，增加修改也很简单），然后写入目标xml文件的例子。

  QFile srcFile(srcFileName);
    if (!srcFile.open(QFile::ReadOnly | QFile::Text)) {
        QMessageBox::warning(this, tr("Warning/ Convert"),
                          tr("Cannot open soruce file %1:\n%2.")
                          .arg(srcFileName)
                          .arg(srcFile.errorString()));
        return;
    }

    QFile tarFile(tarFileName);
    if (!tarFile.open(QFile::WriteOnly | QFile::Text | QIODevice::Truncate)) {
        QMessageBox::warning(this, tr("Warning/ Convert"),
                          tr("Cannot open target file %1:\n%2.")
                          .arg(tarFileName)
                          .arg(tarFile.errorString()));
        srcFile.close();
        return;
    }

    QXmlStreamReader reader(&srcFile);
    QXmlStreamWriter writer(&tarFile);

    writer.setAutoFormatting(true);
    writer.writeStartDocument();

   while (!reader.atEnd())
    {
        reader.readNext();

        if(reader.isStartElement())
        {
            QXmlStreamAttributes attr = reader.attributes();
            writer.writeStartElement(reader.name().toString());
            if(attr.size()>0)
            {
                writer.writeAttributes(attr);
            }
        }
        if(reader.isCharacters())
        {
            writer.writeCharacters(reader.text().toString());
        }
        if(reader.isEndElement())
        {
            writer.writeEndElement();
        }
    }

    writer.writeEndDocument();

    srcFile.close();
    tarFile.Close();