How to delete and add data to a QDomDocument file

MirreCap · wrote on 20 Sept 2019, 19:21

I have a xml file that I need to change according some variables.
This is my xml:

<?xml version='1.0' encoding='UTF-8'?>
<fiducial_circle>
 <threshold>
  <value0 value="30"/>
  <value1 value="125"/>
  <value2 value="120"/>
  <value3 value="255"/>
 </threshold>
 <dilation_erosion>
  <value0 value="25"/>
  <value1 value="25"/>
 </dilation_erosion>
 <select_shape id="0">
  <value0 value="circularity"/>
  <value1 value="0.1"/>
  <value2 value="1"/>
  <value3 value="area"/>
  <value4 value="50"/>
  <value5 value="150"/>
  <value6 value="bulkiness"/>
  <value7 value="0.9"/>
  <value8 value="1.1"/>
 </select_shape>
 <select_shape id="1">
  <value0 value="roundness"/>
  <value1 value="0"/>
  <value2 value="0.5"/>
  <value3 value="width"/>
  <value4 value="167"/>
  <value5 value="1234"/>
  <value6 value="ratio"/>
  <value7 value="0.9"/>
  <value8 value="0.95"/>
 </select_shape>
 <metrology>
  <value0 value="7"/>
  <value1 value="25"/>
 </metrology>
</fiducial_circle>

I have a QVector<QVector<QString>> named list_select_shape whit the new variables: list_select_shape[0] = area, 0, 20, ratio, 0, 0.8 and list_select_shape[1] = area, 200, 220, roundness, 0, 0.7, dist_mean, 1, 3, holes, 0, 14.
At this point, I need to eliminate every info from select_shape id="0" and select_shape id="1", add the new ones and save it. It is supposed to became like that:

<?xml version='1.0' encoding='UTF-8'?>
<fiducial_circle>
 <threshold>
  <value0 value="30"/>
  <value1 value="125"/>
  <value2 value="120"/>
  <value3 value="255"/>
 </threshold>
 <dilation_erosion>
  <value0 value="25"/>
  <value1 value="25"/>
 </dilation_erosion>
 <select_shape id="0">
  <value0 value="area"/>
  <value1 value="0"/>
  <value2 value="20"/>
  <value3 value="ratio"/>
  <value4 value="0"/>
  <value5 value="0.8"/>
 </select_shape>
 <select_shape id="1">
  <value0 value="area"/>
  <value1 value="200"/>
  <value2 value="220"/>
  <value3 value="roundness"/>
  <value4 value="0"/>
  <value5 value="0.7"/>
  <value6 value="dist_mean"/>
  <value7 value="1"/>
  <value8 value="3"/>
  <value9 value="holes"/>
  <value10 value="0"/>
  <value11 value="14"/>
 </select_shape>
 <metrology>
  <value0 value="7"/>
  <value1 value="25"/>
 </metrology>
</fiducial_circle>

I have this so far, but can delete all and when I can, I can't add more child

    QFile file(file_name_data + "_data.xml");
    QFile data(file_name_data + "_data.xml");
    QDomDocument xml_file;
    QDomElement xml_element, xml_function, xml_child;
    QString value;
    QVector<QString> list_select;

    if (!file.open(QIODevice::ReadOnly)) 
    {
        std::cout << "File not found!" << std::endl;
    }
    else
    {
        xml_file.setContent(&file); 
        file.close();
        xml_element = xml_file.documentElement();
        xml_function = xml_element.firstChildElement();

        while(!xml_function.isNull())
        {
            int index = 0;
            xml_child = xml_function.firstChildElement();
            while(!xml_child.isNull())
            {
                if (xml_function.tagName().toStdString() == "threshold")
                {
                    xml_child.setAttribute("value", list_threshold[index]);
                    index += 1;
                }
                else if (xml_function.tagName().toStdString() == "dilation_erosion")
                {
                    xml_child.setAttribute("value", list_dilation_erosion [index]);
                    index += 1;
                }
                else if (xml_function.tagName().toStdString() == "select_shape")
                {
                    if (xml_function.attribute("id", "No id found") == QString::number(count_ss-1))
                    {
                       //change tha xml data here
                    }
                }
                else if (xml_function.tagName().toStdString() == "metrology")
                {
                    xml_child.setAttribute("value", list_metrology [index]);
                    index += 1; 
                }
                else
                {
                    xml_function = xml_function.nextSiblingElement();
                }
                xml_child = xml_child.nextSiblingElement();
            }
            xml_function = xml_function.nextSiblingElement();
            if (list_select.size() != 0)
            {
                list_select_shape << list_select;
                list_select.clear();
            }
        }
    }

    data.open(QIODevice::ReadWrite);
    QTextStream stream(&data);
    stream << xml_file.toString();
    data.close();

Can some one help me with my problem? Thank you

SGaist · wrote on 20 Sept 2019, 19:33

Hi,

You can take a look at the DOM bookmarks example.

On a side note, there's no need for all these conversions to std::string.