SoFunction
Updated on 2025-04-13

Detailed explanation of the usage of C++ XML library

In C++, the read and write operations of XML files can be implemented through various libraries. Here are a few commonly used and concise libraries:

1. ​TinyXML-2

  • ​Introduction: TinyXML-2 is a lightweight C++ XML parsing library that is easy to use and has good performance.
  • ​Features:
    • Simple and easy to use, and the API is intuitive.
    • Small memory footprint, suitable for embedded systems.
    • Supports reading and writing of XML files.
  • ​Install: Just include the header file and the source file.

TinyXML-2andpugixmlIt is the most commonly used XML processing library and is suitable for most scenarios.

#include "xml_lib/"
#include <iostream>
using namespace tinyxml2;
int main() {
    // Create XML document object    XMLDocument doc;
    // Read XML files    if (("") != XML_SUCCESS) {
        std::cerr << "Failed to load XML file!" << std::endl;
        return 1;
    }
    // Get the root node    XMLElement* root = ("RegisterDescription");
    if (!root) {
        std::cerr << "No root element found!" << std::endl;
        return 1;
    }
    // Read child node content    // XMLElement* element = root->FirstChildElement("Name=public_system_status");
    // if (element) {
    //     XMLElement* element2 = element->FirstChildElement("DisplayName");
    //     std::cout << "Element2 text: " << element2->GetText() << std::endl;
    // }
    /* traversal node information */
    for (XMLElement* child = root->FirstChildElement(); child != nullptr; child = child->NextSiblingElement()) {
        // Check whether the node name is "Integer"        if (strcmp(child->Name(), "Integer") == 0) {
            // Check whether the properties "Name" and "NameSpace" meet the criteria            const char* name = child->Attribute("Name");
            const char* nameSpace = child->Attribute("NameSpace");
            if (name && nameSpace && strcmp(name, "public_reserved_0x0008") == 0 && strcmp(nameSpace, "Custom") == 0) {
                // Find the target node                //std::cout << "Found target node: " << child->Name() << std::endl;
                std::cout << "Found target node: " << child->FirstChildElement("pValue")->GetText() << std::endl;
                // Get the text content of the node (if any)                const char* text = child->GetText();
                if (text) {
                    std::cout << "Node text: " << text << std::endl;
                }
                // The target node can be processed here                break; // Exit the loop after finding it            }
        }
    }
    // Modify or add new nodes    XMLElement* newElement = ("newElement");
    newElement->SetText("LiuMing");
    root->InsertEndChild(newElement);
    // Save the modified XML file    if (("") != XML_SUCCESS) {
        std::cerr << "Failed to save XML file!" << std::endl;
        return 1;
    }
    std::cout << "XML file updated successfully!" << std::endl;
    return 0;
}

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