Read xml file

[ivanicy]

Hello.

I am trying to read a xml file but I can't get. This is the xml file:

<?xml version="1.0" encoding="UTF-8"?>
<SceneData version="v1.0">
    <GraphicsItemList>
        <MaxNode xCoord="559" yCoord="231"/>
        <RoiItem>
            <RoiItemText xCoord="160" yCoord="44"/>
            <RoiItemMaxText xCoord="295" yCoord="174"/>
            <RoiItemMinText xCoord="268" yCoord="170"/>
            <RoiItemROI xCoord="170" yCoord="59"/>
            <RoiItemFirst xCoord="170" yCoord="59"/>
            <RoiItemSecond xCoord="376" yCoord="229"/>
            <RoiItemMax xCoord="295" yCoord="174"/>
            <RoiItemMin xCoord="268" yCoord="170"/>
        </RoiItem>
        <PointItem1>
            <PointItem1Text xCoord="451" yCoord="36"/>
            <PointItem1Point xCoord="471" yCoord="56"/>
        </PointItem1>
        <PointItem2>
            <PointItem2Text xCoord="558" yCoord="120"/>
            <PointItem2Point xCoord="578" yCoord="140"/>
        </PointItem2>
        <LineItem>
            <LineItemText xCoord="186" yCoord="279"/>
            <LineItemLine xCoord="0" yCoord="0"/>
            <LineItemFirst xCoord="186" yCoord="279"/>
            <LineItemSecond xCoord="445" yCoord="420"/>
        </LineItem>
        <MinNode xCoord="0" yCoord="410"/>
    </GraphicsItemList>
</SceneData>

Any idea to how to start the reading? Thank you very much!

[SGaist]

Hi,

It depends on what you want to do with the content of that file:

QFile
QXmlStreamReader

[ivanicy]

I want to save the information in variables and then emit a signal with this information.

[VRonin]

Then:

@SGaist said in Read xml file:

QXmlStreamReader

http://www.walletfox.com/course/qxmlstreamreaderexample.php

[ivanicy]

With the file that I showed before and this read code:

QXmlStreamReader reader(&file);
    if (reader.readNextStartElement()) {
        if (reader.name() == "SceneData") {
            while (reader.readNextStartElement()) {
                if (reader.name() == "GraphicsItemList") {
                    while (reader.readNextStartElement()) {
                        qDebug() << reader.name();
                        if (reader.name() == "MaxNode") {
                            maxNodeX = reader.attributes().value("xCoord").toString();
                            maxNodeY = reader.attributes().value("yCoord").toString();
                            reader.readNextStartElement();
                        }
                        if (reader.name() == "MinNode") {
                            qDebug() << "MinNode";
                            qDebug() << "minNodeX: " << reader.readElementText();
                            minNodeX = reader.attributes().value("xCoord").toString();
                            minNodeY = reader.attributes().value("yCoord").toString();
                            reader.readNextStartElement();
                        }
                        if (reader.name() == "RoiItem") {
                            qDebug() << "RoiItem";
                            while (reader.readNextStartElement()) {
                                if (reader.name() == "RoiItemText") {
                                    qDebug() << "    RoiItemText";
                                    roiTextX = reader.attributes().value("xCoord").toString();
                                    roiTextY = reader.attributes().value("yCoord").toString();
                                    reader.readNextStartElement();
                                }
                                if (reader.name() == "RoiItemMaxText") {
                                    qDebug() << "    RoiItemMaxText";
                                    roiMaxTextX = reader.attributes().value("xCoord").toString();
                                    roiMaxTextY = reader.attributes().value("yCoord").toString();
                                    reader.readNextStartElement();
                                }
                                if (reader.name() == "RoiItemMinText") {
                                    qDebug() << "    RoiItemMinText";
                                    roiMinTextX = reader.attributes().value("xCoord").toString();
                                    roiMinTextY = reader.attributes().value("yCoord").toString();
                                    reader.readNextStartElement();
                                }
                                if (reader.name() == "RoiItemFirst") {
                                    qDebug() << "    RoiItemFirst";
                                    roiFirstX = reader.attributes().value("xCoord").toString();
                                    roiFirstY = reader.attributes().value("yCoord").toString();
                                    reader.readNextStartElement();
                                }
                                if (reader.name() == "RoiItemSecond") {
                                    qDebug() << "    RoiItemSecond";
                                    roiSecondX = reader.attributes().value("xCoord").toString();
                                    roiSecondY = reader.attributes().value("yCoord").toString();
                                    reader.readNextStartElement();
                                }
                                if (reader.name() == "RoiItemMax") {
                                    qDebug() << "    RoiItemMax";
                                    roiMaxX = reader.attributes().value("xCoord").toString();
                                    roiMaxY = reader.attributes().value("yCoord").toString();
                                }
                                if (reader.name() == "RoiItemMin") {
                                    qDebug() << "    RoiItemMin";
                                    roiMinX = reader.attributes().value("xCoord").toString();
                                    roiMinY = reader.attributes().value("yCoord").toString();
                                    reader.readNextStartElement();
                                }
                            }
                        }
                        if (reader.name() == "PointItem1") {
                            qDebug() << "PointItem1";
                            while (reader.readNextStartElement()) {
                                if (reader.name() == "PointItem1Text") {
                                    qDebug() << "    PointItem1Text";
                                    point1TextX = reader.attributes().value("xCoord").toString();
                                    point1TextY = reader.attributes().value("yCoord").toString();
                                }
                                if (reader.name() == "PointItem1Point") {
                                    qDebug() << "    PointItem1Point";
                                    point1PointX = reader.attributes().value("xCoord").toString();
                                    point1PointY = reader.attributes().value("yCoord").toString();
                                }
                            }
                        }
                        if (reader.name() == "PointItem2") {
                            qDebug() << "PointItem2";
                            while (reader.readNextStartElement()) {
                                if (reader.name() == "PointItem2Text") {
                                    qDebug() << "    PointItem2Text";
                                    point2TextX = reader.attributes().value("xCoord").toString();
                                    point2TextY = reader.attributes().value("yCoord").toString();
                                }
                                if (reader.name() == "PointItem2Point") {
                                    qDebug() << "    PointItem2Point";
                                    point2PointX = reader.attributes().value("xCoord").toString();
                                    point2PointY = reader.attributes().value("yCoord").toString();
                                }
                            }
                        }
                        if (reader.name() == "LineItem") {
                            qDebug() << "LineItem";
                            while (reader.readNextStartElement()) {
                                if (reader.name() == "LineItemText") {
                                    qDebug() << "    LinteItemText";
                                    lineTextX = reader.attributes().value("xCoord").toString();
                                    lineTextY = reader.attributes().value("yCoord").toString();
                                }
                                if (reader.name() == "LineItemFirst") {
                                    qDebug() << "    LinteItemFirst";
                                    lineFirstX = reader.attributes().value("xCoord").toString();
                                    lineFirstY = reader.attributes().value("yCoord").toString();
                                }
                                if (reader.name() == "LineItemSecond") {
                                    qDebug() << "    LinteItemSecond";
                                    lineSecondX = reader.attributes().value("xCoord").toString();
                                    lineSecondY = reader.attributes().value("yCoord").toString();
                                }
                            }
                        }
                    }
                } reader.raiseError(QObject::tr("Incorrect file"));
            }
        }
    }

I only get the MaxNode and RoiItemText, RoiItemMaxText and RoiItemMinText. The other values are empty.

What am I doing wrong?

Thank you very much

[VRonin]

Do not nest the while, do only 1 big loop.
See: https://github.com/VSRonin/FXhelper/blob/master/FXhelperApp/PortfoliosTab.cpp#L1249 (that reads https://github.com/VSRonin/FXhelper/blob/master/FXhelperApp/Settings.xml)

[ivanicy]

@VRonin Thank you very much!! It works succesfully!