Updating Data in tiny Xml element

Question

My question is: is it possible to change the data in an xml element?

What i want to do is change the data in the element depending on what button is pressed. I currently have it reading and writing to the xml file working but i want to change it to, write a new element first time round and then after that edit the element as it currently just keeps writing a new element each time.

This is my current code for writing the new element

if (doc.LoadFile(XMLDOC) == tinyxml2::XML_SUCCESS){
    //Get Root Node
    tinyxml2::XMLElement* rootNode = doc.FirstChildElement();//Assets
    //Get Next Node
    tinyxml2::XMLElement* childNode = rootNode->FirstChildElement();//imagePaths
    //Temp Element 
    tinyxml2::XMLElement* temp = nullptr;
    tinyxml2::XMLElement* temp2 = childNode->FirstChildElement();//path

    while (temp2 != nullptr){
        temp = temp2;
        temp2 = temp2->NextSiblingElement("path");
    }
    if (temp != nullptr){
        //write the text
        tinyxml2::XMLComment* newComment = doc.NewComment("Selected Player");
        tinyxml2::XMLElement* newElement = doc.NewElement("path");

            //get text passed in 
            newElement->SetText(choice.c_str());

            newElement->SetAttribute("name", "selected_player");
            childNode->InsertAfterChild(temp, newComment);
            childNode->InsertAfterChild(newComment, newElement);

    }
    //doc.Print();
    doc.SaveFile(XMLDOC);
    }
    else{
        std::cout << "Could Not Load XML Document : %s" << XMLDOC << std::endl;
    }
}

Thanks for helping in advanced

score 2 · Accepted Answer · answered Apr 08 '15 at 13:19

I'm not 100% sure what the desired behavior you want. Here is a code sample based off of your question code sample:

#include "tinyxml2.h"
#include <iostream>
#include <string>

#define XMLDOC "test.xml"

std::string choice = "New Text";

int main()
{
   tinyxml2::XMLDocument doc;
   if (doc.LoadFile(XMLDOC) == tinyxml2::XML_SUCCESS){
      //Get Root Node
      tinyxml2::XMLElement* rootNode = doc.FirstChildElement();//Assets
      //Get Next Node
      tinyxml2::XMLElement* childNode = rootNode->FirstChildElement();//imagePaths
      //Path Node
      tinyxml2::XMLElement* pathNode = childNode->FirstChildElement();//path

      if (pathNode == nullptr){
         //write the text
         tinyxml2::XMLComment* newComment = doc.NewComment("Selected Player");
         tinyxml2::XMLElement* newElement = doc.NewElement("path");

         newElement->SetAttribute("name", "selected_player");
         newElement->SetText(choice.c_str());

         childNode->InsertFirstChild(newComment);
         childNode->InsertAfterChild(newComment, newElement);
      }
      else{
         pathNode->SetText(choice.c_str());
      }
      doc.SaveFile(XMLDOC);
   }
   else{
      std::cout << "Could Not Load XML Document : " << XMLDOC << std::endl;
   }
}

Given a XML file that looks like this:

<Assets>
<ImagePaths>
</ImagePaths>
</Assets>

After running it would look like this:

<Assets>
<ImagePaths>
    <!--Selected Player-->
    <path name="selected_player">New Text</path>
</ImagePaths>
</Assets>

And if you run the program again you get just the single path node with the text that your choice string contains.

Hope that helps!

Thanks for the help not exactly what i need but has the functionality i need. Should be able get what i want working from it. — Derek O Brien, Apr 08 '15 at 20:48
On further inspection this works perfect for me.. just needed to add a default element to my xml file first. — Derek O Brien, Apr 08 '15 at 21:22

Updating Data in tiny Xml element

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