linux c 解析xml

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

void parseXML(const char *filename) {
    xmlDocPtr doc;
    xmlNodePtr root_element;

    doc = xmlReadFile(filename, NULL, 0);
    if (doc == NULL) {
        fprintf(stderr, "Failed to parse %s\n", filename);
        return;
    }

    root_element = xmlDocGetRootElement(doc);
    if (root_element == NULL) {
        fprintf(stderr, "Empty document\n");
        xmlFreeDoc(doc);
        return;
    }

    printf("Root element: %s\n", root_element->name);

    xmlFreeDoc(doc);
    xmlCleanupParser();
}

int main() {
    parseXML("example.xml");
    return 0;
}

#include <stdio.h>
#include <expat.h>

void startElement(void *userData, const char *name, const char **atts) {
    printf("Start element: %s\n", name);
}

void endElement(void *userData, const char *name) {
    printf("End element: %s\n", name);
}

void characterData(void *userData, const char *s, int len) {
    printf("Character data: %.*s\n", len, s);
}

int main() {
    XML_Parser parser = XML_ParserCreate(NULL);
    if (!parser) {
        fprintf(stderr, "Failed to create parser\n");
        return 1;
    }

    XML_SetElementHandler(parser, startElement, endElement);
    XML_SetCharacterDataHandler(parser, characterData);

    FILE *file = fopen("example.xml", "rb");
    if (!file) {
        perror("Failed to open file");
        XML_ParserFree(parser);
        return 1;
    }

    char buffer[1024];
    int done = 0;
    while (!done) {
        int len = fread(buffer, 1, sizeof(buffer), file);
        if (len == 0) {
            if (feof(file)) {
                done = 1;
            } else {
                perror("Failed to read file");
                break;
            }
        }
        if (!XML_Parse(parser, buffer, len, done)) {
            fprintf(stderr, "Parse error at line %d:\n%s\n",
                    XML_GetCurrentLineNumber(parser),
                    XML_ErrorString(XML_GetErrorCode(parser)));
            break;
        }
    }

    fclose(file);
    XML_ParserFree(parser);
    return 0;
}