使用xml2向节点添加子节点

#include <stdio.h>
#include <libxml/parser.h>
#include <libxml/tree.h>

int main() {
    // 解析XML文档
    xmlDocPtr doc = xmlReadFile("example.xml", NULL, 0);
    if (doc == NULL) {
        printf("Failed to parse XML document.\n");
        return 1;
    }

    // 定位目标节点
    xmlXPathContextPtr xpathCtx = xmlXPathNewContext(doc);
    xmlXPathObjectPtr xpathObj = xmlXPathEvalExpression((xmlChar*)"//parent", xpathCtx);
    if (xpathObj == NULL) {
        printf("Failed to evaluate XPath expression.\n");
        xmlFreeDoc(doc);
        return 1;
    }

    // 创建子节点
    xmlNodePtr parent = xpathObj->nodesetval->nodeTab[0];
    xmlNodePtr child = xmlNewNode(NULL, (xmlChar*)"child");
    xmlNodePtr text = xmlNewText((xmlChar*)"Child node content");
    xmlAddChild(parent, child);
    xmlAddChild(child, text);

    // 保存修改后的XML文档
    xmlSaveFormatFile("modified.xml", doc, 1);

    // 释放资源
    xmlXPathFreeObject(xpathObj);
    xmlXPathFreeContext(xpathCtx);
    xmlFreeDoc(doc);

    return 0;
}