Qt读写xml文件实例

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前端之家收集整理的这篇文章主要介绍了Qt读写xml文件实例，前端之家小编觉得挺不错的，现在分享给大家，也给大家做个参考。
最近项目需要操作xml文件，将自己编写的读写xml文件函数附上。
 
//-------------------------------------------------------------------------
//写入数据到xml文件
bool CWinSystemBackup::WrInfoToXML(const QString &sFileName)
{
 //设置进度
 m_pProgressBar->setValue(5);
 

 QDomDocument doc;
 

 //增加xml的头格式
 

 QDomProcessingInstruction instruction = doc.createProcessingInstruction("xml", "version=\"1.0\" encoding=\"UTF-8\"");
 

 doc.appendChild(instruction);
 

 

 //增加根元素
 

 QDomElement root = doc.createElement("Information");
 

 doc.appendChild(root);
 

 

 //--------------------IP列表----------------------
 

 //定义IP列表子根
 

 QDomElement IProot = doc.createElement("IPList");
 

 root.appendChild(IProot);
 

 

 //获取IP列表
 

 QVector<QString> IPList;
 

 g_TDeviceGroup.GetDevIpList(IPList);
 

 

 for(int i = 0; i < IPList.count(); i++)
 

 {
 

 //增加子节点
 

 QDomElement IPNote = doc.createElement(QString("IP%1").arg(i));
 

 //增加子节点内容
 

 QDomText IPNoteText = doc.createTextNode(IPList.at(i));
 

 IPNote.appendChild(IPNoteText);
 

 //添加子节点
 

 IProot.appendChild(IPNote);
 

 }
 

 //设置进度
 

 m_pProgressBar->setValue(10);
 

 //---------------------------------------------------
 

 

 //----------------------分辨率------------------------
 

 //定义分辨率子根
 

 QDomElement ResolutionRoot = doc.createElement("Resolution");
 

 root.appendChild(ResolutionRoot);
 

 

 QString text = QString("%1 %2 %3 %4 %5 %6 %7 %8 %9 %10 %11 %12 %13 %14").arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPHdsize).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPVdsize).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPFrameNum).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPHPol).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPVpol).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPHsyn).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPVsyn).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPHstart).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPVstart).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPHend).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPVend).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPHtotal).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_nPVtotal).arg(
 

 g_tDeviceInf.Nowdisplay_inf.m_StrnPDisName);
 

 //增加子节点
 

 QDomElement note = doc.createElement("resolution");
 

 //增加子节点内容
 

 QDomText note_text = doc.createTextNode(text);
 

 note.appendChild(note_text);
 

 //添加子节点
 

 ResolutionRoot.appendChild(note);
 

 //设置进度
 

 m_pProgressBar->setValue(30);
 

 //-----------------------------------------------------
 

 

 //---------------------对应关系设置----------------------
 

 //定义对应关系子根
 

 QDomElement RelationRoot = doc.createElement("Relation");
 

 root.appendChild(RelationRoot);
 

 

 for(int i = 0; i < g_QVecUnitList.count(); i++)
 

 {
 

 QString text = QString("%1 %2 %3 %4 %5 %6 %7").arg(
 

 g_QVecUnitList.at(i).m_strDevIp).arg(
 

 g_QVecUnitList.at(i).m_StrDRouteNo).arg(
 

 g_QVecUnitList.at(i).m_nDUnitNo).arg(
 

 g_QVecUnitList.at(i).m_nDStartx).arg(
 

 g_QVecUnitList.at(i).m_nDStarty).arg(
 

 g_QVecUnitList.at(i).m_nDEndx).arg(
 

 g_QVecUnitList.at(i).m_nDEndy);
 

 //增加子节点
 

 QDomElement note = doc.createElement(QString("relation%1").arg(i));
 

 //增加子节点内容
 

 QDomText note_text = doc.createTextNode(text);
 

 note.appendChild(note_text);
 

 //添加子节点
 

 RelationRoot.appendChild(note);
 

 }
 

 //设置进度
 

 m_pProgressBar->setValue(50);
 

 //-----------------------------------------------------
 

 

 //----------------------场景列表------------------------
 

 //定义场景列表子根
 

 QDomElement SceneListRoot = doc.createElement("SceneList");
 

 root.appendChild(SceneListRoot);
 

 for(int i = 0; i < g_tDeviceInf.SceneDeviceInf.count(); i++)
 

 {
 

 QString text = QString("%1 %2 %3 %4 %5").arg(
 

 g_tDeviceInf.SceneDeviceInf.at(i).m_nSName).arg(
 

 g_tDeviceInf.SceneDeviceInf.at(i).m_nSNameStr).arg(
 

 g_tDeviceInf.SceneDeviceInf.at(i).m_nSFileStr).arg(
 

 g_tDeviceInf.SceneDeviceInf.at(i).m_nSState).arg(
 

 g_tDeviceInf.SceneDeviceInf.at(i).m_nSShortcut);
 

 

 QDomElement note = doc.createElement(QString("scenelist%1").arg(i));
 

 //增加子节点内容
 

 QDomText note_text = doc.createTextNode(text);
 

 note.appendChild(note_text);
 

 //添加子节点
 

 SceneListRoot.appendChild(note);
 

 }
 

 //设置进度
 

 m_pProgressBar->setValue(70);
 

 //-----------------------------------------------------
 

 

 //----------------------场景信息------------------------
 

 //定义场景信息子根
 

 QDomElement SceneRoot = doc.createElement("SceneInformation");
 

 root.appendChild(SceneRoot);
 

 

 for(int i = 0; i < g_tDeviceInf.SceneDeviceInf.count(); i++)
 

 {
 

 //定义子根
 

 QDomElement SceneChildRoot = doc.createElement(QString("SceneInfoList%1").arg(i));
 

 SceneRoot.appendChild(SceneChildRoot);
 

 

 // 加载场景信息
 

 QString filename;
 

 filename.sprintf("sen%05d.dat", i + 1);
 

 

 QVector<TWindowParaInf> winSceneInfoList;
 

 g_TDeviceGroup.apt_LoadSceneFromDevice(filename, winSceneInfoList, false);// false: 不替换当前场景
 

 

 for(int j = 0; j < winSceneInfoList.count(); j++)
 

 {
 

 QString text = QString("%1 %2 %3 %4 %5 %6 %7 %8 %9 %10 %11").arg(
 

 winSceneInfoList.at(j).m_nWWinNo).arg(
 

 winSceneInfoList.at(j).m_nWCutEnb).arg(
 

 winSceneInfoList.at(j).m_StrWRouteNo).arg(
 

 winSceneInfoList.at(j).m_cTWindowSiteInf.m_nSStartx).arg(
 

 winSceneInfoList.at(j).m_cTWindowSiteInf.m_nSStarty).arg(
 

 winSceneInfoList.at(j).m_cTWindowSiteInf.m_nSEndx).arg(
 

 winSceneInfoList.at(j).m_cTWindowSiteInf.m_nSEndy).arg(
 

 winSceneInfoList.at(j).m_cTCutWindowInf.m_nCStartx).arg(
 

 winSceneInfoList.at(j).m_cTCutWindowInf.m_nCStarty).arg(
 

 winSceneInfoList.at(j).m_cTCutWindowInf.m_nCEndx).arg(
 

 winSceneInfoList.at(j).m_cTCutWindowInf.m_nCEndy);
 

 

 QDomElement note = doc.createElement(QString("scene%1").arg(j));
 

 //增加子节点内容
 

 QDomText note_text = doc.createTextNode(text);
 

 note.appendChild(note_text);
 

 //添加子节点
 

 SceneChildRoot.appendChild(note);
 

 }
 

 }
 

 //设置进度
 

 m_pProgressBar->setValue(90);
 

 //-----------------------------------------------------
 

 

 

 //删除本地文件
 

 QFile rdfile(sFileName);
 

 if(rdfile.open(QIODevice::ReadOnly))
 

 {
 

 rdfile.remove();
 

 }
 

 

 //写入数据本地新文件
 

 QFile wrfile(sFileName);
 

 

 if (!wrfile.open(QIODevice::WriteOnly | QIODevice::Truncate | QIODevice::Text))
 

 {
 

 //设置进度
 

 m_pProgressBar->setValue(0);
 

 QMessageBox::warning(this, tr("Warning"), tr("Save File Fail !"), QMessageBox::Yes);
 

 return false;
 

 }
 

 

 QTextStream out(&wrfile);
 

 out.setCodec("UTF-8");
 

 doc.save(out, 4, QDomNode::EncodingFromTextStream);
 

 wrfile.close();
 

 

 //设置进度
 

 m_pProgressBar->setValue(100);
 

 return true;
 

}
 



 

xml文件格式如下图所示：
 



 



 



 

//-------------------------------------------------------------------------
//xml文件读取数据
bool CWinSystemBackup::RdInfoFromXML(const QString &sFileName,
 QVector<QString> &IPList,
 TDisplayInf &tDisplayInf,
 QVector <TDisplayUnitInf> &tDisplayUnitInfList,
 QVector <TDeviceSceneInf> &tSceneList,
 QVector<QVector<TWindowParaInf> > &winSceneInfoList)
{
 QString errorStr;
 int errorLine;
 int errorColum;
 QFile file(sFileName);
 if (!file.open(QFile::ReadOnly))
 {
 QMessageBox::warning(this, tr("Open File Fail!"), QMessageBox::Yes);
 //设置进度
 m_pProgressBar->setValue(0);
 return false;
 }
 QDomDocument doc;
 if (!doc.setContent(&file, false, &errorStr, &errorLine, &errorColum))
 {
 QMessageBox::warning(this, QMessageBox::Yes);
 //设置进度
 m_pProgressBar->setValue(0);
 return false;
 }
 //设置进度
 m_pProgressBar->setValue(5);
 QDomElement element;
 element = doc.documentElement();
 if(element.tagName() != "Information")
 {
 QMessageBox::warning(this, tr("File Format Error!"), QMessageBox::Yes);
 //设置进度
 m_pProgressBar->setValue(0);
 return false;
 }
 QDomElement elementChild = element.firstChildElement();
 while (!elementChild.isNull())
 {
 //IP列表
 if (elementChild.toElement().tagName() == "IPList")
 {
 QDomNode elementChildNode = elementChild.firstChild();
 while(!elementChildNode.isNull())
 {
 IPList.append(elementChildNode.toElement().text());
 elementChildNode = elementChildNode.nextSibling();
 }
 qDebug()<< "IPList:" << IPList << endl;
 }
 //当前分辨率
 if (elementChild.toElement().tagName() == "Resolution")
 {
 QDomNode elementChildNode = elementChild.firstChild();
 QString sResolution = elementChildNode.toElement().text();
 qDebug()<< "The resolution is :" << sResolution << endl;
 QStringList sResolutionList = sResolution.split(" ");
 if(sResolutionList.count() == 14)
 {
 tDisplayInf.m_nPHdsize = sResolutionList.at(0).toInt();
 tDisplayInf.m_nPVdsize = sResolutionList.at(1).toInt();
 tDisplayInf.m_nPFrameNum = sResolutionList.at(2).toInt();
 tDisplayInf.m_nPHPol = sResolutionList.at(3).toInt();
 tDisplayInf.m_nPVpol = sResolutionList.at(4).toInt();
 tDisplayInf.m_nPHsyn = sResolutionList.at(5).toInt();
 tDisplayInf.m_nPVsyn = sResolutionList.at(6).toInt();
 tDisplayInf.m_nPHstart = sResolutionList.at(7).toInt();
 tDisplayInf.m_nPVstart = sResolutionList.at(8).toInt();
 tDisplayInf.m_nPHend = sResolutionList.at(9).toInt();
 tDisplayInf.m_nPVend = sResolutionList.at(10).toInt();
 tDisplayInf.m_nPHtotal = sResolutionList.at(11).toInt();
 tDisplayInf.m_nPVtotal = sResolutionList.at(12).toInt();
 tDisplayInf.m_StrnPDisName = sResolutionList.at(13);
 }
 else
 {
 QMessageBox::warning(this, tr("Read Resolution Data Fail!"), QMessageBox::Yes);
 //设置进度
 m_pProgressBar->setValue(0);
 return false;
 }
 //设置进度
 m_pProgressBar->setValue(10);
 }
 //对应关系列表
 if (elementChild.toElement().tagName() == "Relation")
 {
 QVector<QString> RelationList;
 QDomNode elementChildNode = elementChild.firstChild();
 while(!elementChildNode.isNull())
 {
 RelationList.append(elementChildNode.toElement().text());
 elementChildNode = elementChildNode.nextSibling();
 }
 qDebug()<< "Relation:" << RelationList << endl;
 for(int i = 0; i < RelationList.count(); i++ )
 {
 QStringList sRelationList = RelationList.at(i).split(" ");
 if(sRelationList.count() == 7)
 {
 TDisplayUnitInf tDisPlayUnitInfo;
 tDisPlayUnitInfo.m_strDevIp = sRelationList.at(0);
 tDisPlayUnitInfo.m_StrDRouteNo = sRelationList.at(1);
 tDisPlayUnitInfo.m_nDUnitNo = sRelationList.at(2).toInt();
 tDisPlayUnitInfo.m_nDStartx = sRelationList.at(3).toInt();
 tDisPlayUnitInfo.m_nDStarty = sRelationList.at(4).toInt();
 tDisPlayUnitInfo.m_nDEndx = sRelationList.at(5).toInt();
 tDisPlayUnitInfo.m_nDEndy = sRelationList.at(6).toInt();
 tDisplayUnitInfList.append(tDisPlayUnitInfo);
 }
 else
 {
 QMessageBox::warning(this, tr("Read Relation Data Fail!"), QMessageBox::Yes);
 //设置进度
 m_pProgressBar->setValue(0);
 return false;
 }
 }
 //设置进度
 m_pProgressBar->setValue(20);
 }
 //场景列表
 if (elementChild.toElement().tagName() == "SceneList")
 {
 QVector<QString> SceneList;
 QDomNode elementChildNode = elementChild.firstChild();
 while(!elementChildNode.isNull())
 {
 SceneList.append(elementChildNode.toElement().text());
 elementChildNode = elementChildNode.nextSibling();
 }
 qDebug()<< "SceneList:" << SceneList << endl;
 for(int i = 0; i < SceneList.count(); i++ )
 {
 QStringList sSceneList = SceneList.at(i).split(" ");
 if(sSceneList.count() == 5)
 {
 TDeviceSceneInf tSceneInfo;
 tSceneInfo.m_nSName = sSceneList.at(0).toInt();
 tSceneInfo.m_nSNameStr = sSceneList.at(1);
 tSceneInfo.m_nSFileStr = sSceneList.at(2);
 tSceneInfo.m_nSState = sSceneList.at(3).toInt();
 tSceneInfo.m_nSShortcut = sSceneList.at(4).toInt();
 tSceneList.append(tSceneInfo);
 }
 else
 {
 QMessageBox::warning(this, tr("Read Scene List Data Fail!"), QMessageBox::Yes);
 //设置进度
 m_pProgressBar->setValue(0);
 return false;
 }
 }
 //设置进度
 m_pProgressBar->setValue(30);
 }
 //场景信息
 if (elementChild.toElement().tagName() == "SceneInformation")
 {
 QDomElement elementGrandson = elementChild.firstChildElement();
 if(!elementGrandson.isNull())
 {
 for(int i = 0; i < tSceneList.count(); i++)
 {
 if(elementGrandson.toElement().tagName() == QString("SceneInfoList%1").arg(i))
 {
 QVector<QString> SceneInfoList;
 QDomNode elementGrandsonNode = elementGrandson.firstChild();
 while(!elementGrandsonNode.isNull())
 {
 SceneInfoList.append(elementGrandsonNode.toElement().text());
 elementGrandsonNode = elementGrandsonNode.nextSibling();
 }
 qDebug()<< "SceneInfoList:" << SceneInfoList << endl;
 QVector<TWindowParaInf> SceneInfo;
 for(int j = 0; j < SceneInfoList.count(); j++ )
 {
 QStringList sSceneInfoList = SceneInfoList.at(j).split(" ");
 if(sSceneInfoList.count() == 11)
 {
 TWindowParaInf tWinSceneInfo;
 tWinSceneInfo.m_nWWinNo = sSceneInfoList.at(0).toInt();
 tWinSceneInfo.m_nWCutEnb = sSceneInfoList.at(1).toInt();
 tWinSceneInfo.m_StrWRouteNo = sSceneInfoList.at(2);
 tWinSceneInfo.m_cTWindowSiteInf.m_nSStartx = sSceneInfoList.at(3).toInt();
 tWinSceneInfo.m_cTWindowSiteInf.m_nSStarty = sSceneInfoList.at(4).toInt();
 tWinSceneInfo.m_cTWindowSiteInf.m_nSEndx = sSceneInfoList.at(5).toInt();
 tWinSceneInfo.m_cTWindowSiteInf.m_nSEndy = sSceneInfoList.at(6).toInt();
 tWinSceneInfo.m_cTCutWindowInf.m_nCStartx = sSceneInfoList.at(7).toInt();
 tWinSceneInfo.m_cTCutWindowInf.m_nCStarty = sSceneInfoList.at(8).toInt();
 tWinSceneInfo.m_cTCutWindowInf.m_nCEndx = sSceneInfoList.at(9).toInt();
 tWinSceneInfo.m_cTCutWindowInf.m_nCEndy = sSceneInfoList.at(10).toInt();
 SceneInfo.append(tWinSceneInfo);
 }
 else
 {
 QMessageBox::warning(this, tr("Read Scene Information Data Fail!"), QMessageBox::Yes);
 //设置进度
 m_pProgressBar->setValue(0);
 return false;
 }
 }
 winSceneInfoList.append(SceneInfo);
 }
 elementGrandson = elementGrandson.nextSiblingElement();
 }
 }
 //设置进度
 m_pProgressBar->setValue(40);
 }
 elementChild = elementChild.nextSiblingElement();
 }
 return true;
}

      

      
                 
              

            

          

          
          
          

            

              




            

          


          

            

              

                  
    
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