TinyXML2 - 在XML的中間插入元素

Question

我正在尋找在數據添加到我的XML結構中間的新元素。我如何在需要他們的地方追加他們？

當前代碼：

XMLElement *node = doc.NewElement("timeStamp"); 
XMLText *text = doc.NewText("new time data"); 
node->LinkEndChild(text); 
doc.FirstChildElement("homeML")->FirstChildElement("mobileDevice")->FirstChildElement("event")->LinkEndChild(node); 
doc.SaveFile("homeML.xml"); 

我的XML結構的示例部分：

<mobileDevice> 
    <mDeviceID/> 
    <deviceDescription/> 
    <units/> 
    <devicePlacement/> 
    <quantisationResolution/> 
    <realTimeInformation> 
     <runID/> 
     <sampleRate/> 
     <startTimeStamp/> 
     <endTimeStamp/> 
     <data/> 
    </realTimeInformation> 
    <event> 
     <mEventID/> 
     <timeStamp/> 
     <data/> 
     <support/> 
    </event> 
</mobileDevice> 

我期待它添加addtional timeStamp標籤mobileDevice->event下mEventID和data之間，此刻他們被追加在support標籤後面，我怎麼才能讓他們進入正確的地方？

當前位置運行時：

<mobileDevice> 
    <mDeviceID/> 
    <deviceDescription/> 
    <units/> 
    <devicePlacement/> 
    <quantisationResolution/> 
    <realTimeInformation> 
     <runID/> 
     <sampleRate/> 
     <startTimeStamp/> 
     <endTimeStamp/> 
     <data/> 
    </realTimeInformation> 
    <event> 
     <mEventID/> 
     <timeStamp/> 
     <data/> 
     <support/> 
     <timeStamp>new time data</timeStamp> 
    </event> 
</mobileDevice> 

Answer 1

你想用InsertAfterChild()做到這一點。下面是應該做你想做的一個例子（假設「移動設備」是你的文檔的根元素）：

// Get the 'root' node 
XMLElement * pRoot = doc.FirstChildElement("mobileDevice"); 

// Get the 'event' node 
XMLElement * pEvent = pRoot->FirstChildElement("event"); 

// This is to store the element after which we will insert the new 'timeStamp' 
XMLElement * pPrecedent = nullptr; 

// Get the _first_ location immediately before where 
//  a 'timeStamp' element should be placed 
XMLElement * pIter = pEvent->FirstChildElement("mEventID"); 

// Loop through children of 'event' & find the last 'timeStamp' element 
while (pIter != nullptr) 
{ 
    // Store pIter as the best known location for the new 'timeStamp' 
    pPrecedent = pIter; 

    // Attempt to find the next 'timeStamp' element 
    pIter = pIter->NextSiblingElement("timeStamp"); 
} 

if (pPrecedent != nullptr) 
{ 
    // Build your new 'timeStamp' element, 
    XMLElement * pNewTimeStamp = xmlDoc.NewElement("timeStamp"); 
    pNewTimeStamp->SetText("Your data here"); 

    // ..and insert it to the event element like this: 
    pEvent->InsertAfterChild(pPrecedent, pNewTimeStamp); 
} 

這是一個有趣的，可能常見的情況。幾個月前我寫了一個TinyXML2 tutorial，所以我會加入它。