QTreeWidget 保存和显示xml文件

这与以前写的一篇文章类似：https://www.cnblogs.com/warmlight/p/12033459.html。不同的是这篇文章是读取xml文件，将xml 的tagname做为树节点的text，保存时完全按照树节点的text保存。

说明：首先在pro文件中 添加 QT += xml。对于本例子中的对话框中，一个树控件，两个按钮。如果想把示例中的xml信息完全放到树上，那就需要自己做点什么了。另外，加载xml文件时，是绝对路径。如果不知道怎么改，我觉得你需要回炉深造一下~~

不说太多了，把源码贴上去。

ManageTreeXml.cpp

#include "ManageTreeXml.h"
#include <QStack>
#include <QFile>
#include <QDebug>

#define TREE_LINK_TYPE          "LINKPORT_TYPE"
#define TREE_PACKAGE_TYPE       "PACKAGE_TYPE"

ManageTreeXml::ManageTreeXml()
{
}

bool ManageTreeXml::SaveTreeXml(QTreeWidget *pTree, QString xmlPath)
{
    QDomDocument doc;
    QDomProcessingInstruction head = doc.createProcessingInstruction("xml", "version=\"1.0\" encoding=\"UTF-8\"");
    doc.appendChild(head);
    //invisibleRootItem()函数并不是得到我们想要的这个顶层节点，它得到的是所有节点的最终根节点，因此，得到顶层节点需要自己写操作，下面是根据任意一个节点获取其可见顶层节点的代码
    QTreeWidgetItem *rootItem = pTree->invisibleRootItem(); //树的根节点
    QTreeWidgetItem* childItem = rootItem->child(0);

    QString strRoot;
    strRoot = childItem->text(0);
    QDomElement root = doc.createElement(strRoot);
    doc.appendChild(root);

    SaveItem(root, childItem, doc);

    QFile file(xmlPath);
    if (!file.open(QIODevice::WriteOnly)){
        return false;
    }
    QString xml = doc.toString();
    QTextStream txtOutput(&file);
    txtOutput.setCodec("UTF-8");
    txtOutput<<xml;
    file.close();

    return true;
}

bool ManageTreeXml::LoadTreeXml(QTreeWidget *pTree, QString xmlPath)
{
    pTree->clear();

    if(xmlPath.isEmpty())   return false;

    QDomDocument* doc = new QDomDocument;
    QFile fl(xmlPath);
    if(!doc->setContent(&fl)){
        fl.close();
        return false;
    }
    fl.close();

    showXml(pTree, doc,false);

    return false;
}

bool ManageTreeXml::showXml(QTreeWidget* pTree, QDomDocument* pDoc, bool bEditable)
{
    if(pDoc == NULL)    return false;

//    QDomNodeList RootLst =  pDoc->elementsByTagName(XML_ROOT);
//    QDomNode root = RootLst.item(0);

    QDomElement docElem = pDoc->documentElement();

    QTreeWidgetItem* it = new QTreeWidgetItem;
    if(bEditable){
        it->setFlags(Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
    }
//    qDebug() << root.toElement().tagName();
    it->setText(0 ,docElem.tagName());
    pTree->addTopLevelItem(it);

    showXmlTreeNode(pTree, docElem.firstChild() ,it, bEditable);

    pTree->expandAll();
    return true;
}

bool ManageTreeXml::showXmlTreeNode(QTreeWidget* pTree, QDomNode domParent ,QTreeWidgetItem* treeParent, bool bEditable)
{
    while(!domParent.isNull()){
        QTreeWidgetItem* it = new QTreeWidgetItem;
        if(bEditable){
            it->setFlags(Qt::ItemIsEditable|Qt::ItemIsEnabled|Qt::ItemIsSelectable);
        }
        setTreeNodeText(domParent ,it);
        treeParent->addChild(it);
        if(domParent.hasChildNodes()){
            showXmlTreeNode(pTree, domParent.firstChild() ,it, bEditable);
        }
        domParent = domParent.nextSibling();
    }
    return true;
}

void ManageTreeXml::setTreeNodeText(QDomNode Node ,QTreeWidgetItem* treeNode)
{
    if(treeNode == NULL)    return;

    treeNode->setText(0 ,Node.toElement().tagName());
//    qDebug() << "ItemText:" << Node.toElement().tagName();

    QString treeType = TREE_PACKAGE_TYPE;
    if(treeType == TREE_LINK_TYPE)
    {
//        treeNode->setText(1 ,Node.toElement().attribute("portName"));
//        treeNode->setText(2 ,Node.toElement().attribute("portDesc"));
//        treeNode->setText(3 ,Node.toElement().attribute("portType"));
//        treeNode->setText(4 ,Node.toElement().attribute("portIP"));
//        treeNode->setText(5 ,Node.toElement().attribute("portOrBaudRate"));
    }
    else if(treeType == TREE_PACKAGE_TYPE)
    {
//        treeNode->setText(1 ,Node.toElement().attribute("Value"));
//        treeNode->setText(2 ,Node.toElement().attribute("Name"));
//        treeNode->setText(3 ,Node.toElement().attribute("Index"));
//        treeNode->setText(4 ,Node.toElement().attribute("Type"));
//        treeNode->setText(5 ,Node.toElement().attribute("Len"));
//        treeNode->setText(6 ,Node.toElement().attribute("Desc"));
    }
}


void ManageTreeXml::SaveItem(QDomElement& root, QTreeWidgetItem *item, QDomDocument& doc)
{
    int countChild = item->childCount();
    for (int i = 0; i < countChild; i++)
    {
        QTreeWidgetItem *childItem = item->child(i);
        QString itemTxt = childItem->text(0);
        QDomElement ele = doc.createElement(itemTxt);
        root.appendChild(ele);

        SaveItem(ele,childItem,doc);
    }
}

ManageTreeXml.h

#ifndef MANAGETREEXML_H
#define MANAGETREEXML_H
#include <QTreeWidget>
#include <QDomDocument>

class ManageTreeXml
{
public:
    ManageTreeXml();

    bool SaveTreeXml(QTreeWidget* pTree, QString xmlPath);
    bool LoadTreeXml(QTreeWidget* pTree, QString xmlPath);
private:
    bool showXml(QTreeWidget* pTree, QDomDocument *pDoc, bool bEditable);
    bool showXmlTreeNode(QTreeWidget* pTree, QDomNode domParent, QTreeWidgetItem *treeParent, bool bEditable);
    void setTreeNodeText(QDomNode Node, QTreeWidgetItem *treeNode);

    void SaveItem(QDomElement& root,QTreeWidgetItem* item,QDomDocument& doc);
};

#endif // MANAGETREEXML_H

DlgTreeXml.cpp

#include "DlgTreeXml.h"
#include "ui_DlgTreeXml.h"
#include "ManageTreeXml.h"

DlgTreeXml::DlgTreeXml(QWidget *parent) :
    QDialog(parent),
    ui(new Ui::DlgTreeXml)
{
    ui->setupUi(this);

    QStringList qv;
    qv.push_back("标签");//qv.push_back("值");qv.push_back("名称");qv.push_back("索引");qv.push_back("类型");qv.push_back("长度");qv.push_back("描述");
    ui->treeWidget->setHeaderLabels(qv);
}

DlgTreeXml::~DlgTreeXml()
{
    delete ui;
}

void DlgTreeXml::on_btnLoadXml_clicked()
{
    LoadXml();
}

void DlgTreeXml::on_btnSaveXml_clicked()
{
    SaveXml();
}

bool DlgTreeXml::LoadXml()
{
    ManageTreeXml xml;
    xml.LoadTreeXml(ui->treeWidget, "D:/_work/scenePro/1.xml");
    return false;
}

bool DlgTreeXml::SaveXml()
{
    ManageTreeXml xml;
    xml.SaveTreeXml(ui->treeWidget, "D:/_work/scenePro/2.xml");
    return false;
}

DlgTreeXml.h

#ifndef DLGTREEXML_H
#define DLGTREEXML_H

#include <QDialog>

namespace Ui {
class DlgTreeXml;
}

class DlgTreeXml : public QDialog
{
    Q_OBJECT

public:
    explicit DlgTreeXml(QWidget *parent = 0);
    ~DlgTreeXml();

private slots:
    void on_btnLoadXml_clicked();

    void on_btnSaveXml_clicked();

private:
    Ui::DlgTreeXml *ui;

    bool LoadXml();
    bool SaveXml();
};

#endif // DLGTREEXML_H

 

示例xml（如果想将示例xml的信息全部挂到树上，请查阅：https://www.cnblogs.com/warmlight/p/12974114.html）

<?xml version='1.0' encoding='UTF-8'?>
<MyItem>
<Package Head="check" Desc="" Name="接收数据" Id="9">
  <Field Desc="经度" Value="118.244" Type="Float" Name="经度"/>
  <Field Desc="纬度" Value="42.078105" Type="Float" Name="纬度"/>
  <Field Desc="高度" Value="8.8" Type="Float" Name="高度"/>
  <Field Desc="高度1" Value="184.8" Type="Float" Name="高度1"/>
 </Package>
 <Package Head="check" Desc="" Name="校正数据" Id="10">
  <Field Desc="经度" Value="116.244945" Type="Float" Name="经度"/>
  <Field Desc="纬度" Value="40.078105" Type="Float" Name="纬度"/>
  <Field Desc="高度" Value="10.8" Type="Float" Name="高度"/>
 </Package>
 <Package Head="send" Desc="" Name="发送数据" Id="11">
   <Field Desc="经度" Value="116.244945" Type="Float" Name="经度">
    <SubField Desc="则经度" Value="116.244945" Type="Float" Name="经度">
        <SubField Desc="zizi经度" Value="116.244945" Type="Float" Name="经度"/>
        <SubField11 Desc="则经度" Value="116.244945" Type="Float" Name="经度"/>
    </SubField>
    </Field>
  <Field Desc="纬度" Value="40.078105" Type="Float" Name="纬度"/>
  <Field Desc="高度" Value="10.8" Type="Float" Name="高度"/>
 </Package>
</MyItem>

效果图：

 

 

 生成的xml

<?xml version="1.0" encoding="UTF-8"?>
<MyItem>
 <Package>
  <Field/>
  <Field/>
  <Field/>
  <Field/>
 </Package>
 <Package>
  <Field/>
  <Field/>
  <Field/>
 </Package>
 <Package>
  <Field>
   <SubField>
    <SubField/>
    <SubField11/>
   </SubField>
  </Field>
  <Field/>
  <Field/>
 </Package>
</MyItem>