如何使用libxml2 - 用C編程

Question

的HTML也許髒的標籤數據的提前結束這種

我該怎麼辦呢解析HTML髒？謝謝

Answer 1

使用libxml2 HTML解析器，它會將「髒」HTML標準化爲標準化樹。 看到htmlDocPtr htmlParseFile(const char * filename, const char * encoding)

http://xmlsoft.org/html/libxml-HTMLparser.html

Answer 2

我遇到這麼多麻煩，由於缺乏知識。所以我寫了整個演示程序來使用libxml2庫解析HTML。

#include <stdio.h> 
#include <string.h> 
#include <stdlib.h> 
#include <libxml/HTMLparser.h> 

void traverse_dom_trees(xmlNode * a_node) 
{ 
    xmlNode *cur_node = NULL; 

    if(NULL == a_node) 
    { 
     //printf("Invalid argument a_node %p\n", a_node); 
     return; 
    } 

    for (cur_node = a_node; cur_node; cur_node = cur_node->next) 
    { 
     if (cur_node->type == XML_ELEMENT_NODE) 
     { 
      /* Check for if current node should be exclude or not */ 
      printf("Node type: Text, name: %s\n", cur_node->name); 
     } 
     else if(cur_node->type == XML_TEXT_NODE) 
     { 
      /* Process here text node, It is available in cpStr :TODO: */ 
      printf("node type: Text, node content: %s, content length %d\n", (char *)cur_node->content, strlen((char *)cur_node->content)); 
     } 
     traverse_dom_trees(cur_node->children); 
    } 
} 

int main(int argc, char **argv) 
{ 
    htmlDocPtr doc; 
    xmlNode *roo_element = NULL; 

    if (argc != 2) 
    { 
     printf("\nInvalid argument\n"); 
     return(1); 
    } 

    /* Macro to check API for match with the DLL we are using */ 
    LIBXML_TEST_VERSION  

    doc = htmlReadFile(argv[1], NULL, HTML_PARSE_NOBLANKS | HTML_PARSE_NOERROR | HTML_PARSE_NOWARNING | HTML_PARSE_NONET); 
    if (doc == NULL) 
    { 
     fprintf(stderr, "Document not parsed successfully.\n"); 
     return 0; 
    } 

    roo_element = xmlDocGetRootElement(doc); 

    if (roo_element == NULL) 
    { 
     fprintf(stderr, "empty document\n"); 
     xmlFreeDoc(doc); 
     return 0; 
    } 

    printf("Root Node is %s\n", roo_element->name); 
    traverse_dom_trees(roo_element); 

    xmlFreeDoc(doc);  // free document 
    xmlCleanupParser(); // Free globals 
    return 0; 
}