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电梯直达

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发表于 2008-12-08 09:58 |只看该作者 |倒序浏览

test.xml

<?xml version="1.0"?>
<story>
<storyinfo>
<author>John Fleck</author>
<datewritten>June 2, 2002</datewritten>
<keyword>example keyword</keyword>
</storyinfo>
<body>
<headline>This is the headline</headline>
<para>This is the body text.</para>
</body>
</story>

复制代码

获取所有节点名称的代码：

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>

xmlNodePtr currentNode;

xmlNodePtr parseDoc(char *docname) {

    xmlDocPtr doc;
    xmlNodePtr cur;

    xmlKeepBlanksDefault(0);
    doc = xmlParseFile(docname);

    if (doc == NULL ) {
        fprintf(stderr,"Document not parsed successfully. \n");
        return;
    }

    cur = xmlDocGetRootElement(doc);

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

    return cur;
}

void printChildrenNames(xmlNodePtr cur) {
    if (cur != NULL) {
        cur = cur->xmlChildrenNode;

        while (cur != NULL){
            printf("Current Node: %s\n", cur->name);
            printChildrenNames(cur);
            cur = cur->next;
        }

        return;
    }else{
        fprintf(stderr, "ERROR: Null Node!");
        return;
    }
}

int main(int argc, char **argv) {

    char *docname;

    if (argc <= 1) {
        printf("Usage: %s docname\n", argv[0]);
        return(0);
    }

    docname = argv[1];
    currentNode = parseDoc (docname);
    //printf("Root Node: %s\n", currentNode->name);

    printChildrenNames(currentNode);
    return (1);
}

可是奇怪的是程序运行的结果是：
Current Node: storyinfo
Current Node: author
Current Node: text
Current Node: datewritten
Current Node: text
Current Node: keyword
Current Node: text
Current Node: body
Current Node: headline
Current Node: text
Current Node: para
Current Node: text
为啥会有这么多的text是哪来的？

[ 本帖最后由 brumby007 于 2008-12-8 11:19 编辑 ]

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smallstar001

富足长乐

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2楼 [报告]

发表于 2008-12-08 10:14 |只看该作者

去理解DOM，每一个文本都是text节点

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

5毛党党员

大富大贵

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3楼 [报告]

发表于 2008-12-08 10:16 |只看该作者

lz如果不理解，可以在嵌套的时候，打印一下嵌套的层次

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

brumby007

丰衣足食

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4楼 [报告]

发表于 2008-12-08 10:54 |只看该作者

那是不是说打出这个text的段是遍历到节点的值的时候打出来的？
比如：
<para>This is the body text.</para>
程序会遍历到This is the body text
此时打印text

如果是这样的话，那我想要实现取得一个xml中的所有节点的名称该咋办（不用xpath的情况下）？

实战分享：从技术角度谈机器学习入门| 【大话IT】RadonDB低门槛向MySQL集群下战书 | ChinaUnix打赏功能已上线！ | 新一代分布式关系型数据库RadonDB知多少？

brumby007

丰衣足食

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5楼 [报告]

发表于 2008-12-08 11:07 |只看该作者

哦，我找到方法了

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <libxml/xmlmemory.h>
#include <libxml/parser.h>

xmlNodePtr currentNode;
xmlDocPtr doc;
xmlNodePtr parseDoc(char *docname) {

    //xmlDocPtr doc;

    xmlNodePtr cur;
    
    xmlKeepBlanksDefault(0);
    doc = xmlParseFile(docname);
    
    if (doc == NULL ) {
        fprintf(stderr,"Document not parsed successfully. \n");
        return;
    }
    
    cur = xmlDocGetRootElement(doc);

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

void printChildrenNames(xmlNodePtr cur) {
    if (cur != NULL) {
        cur = cur->xmlChildrenNode;
        
        while (cur != NULL){
            if(cur->type == XML_ELEMENT_NODE){
                printf("Current Node: %s\n", cur->name);
            }
            printChildrenNames(cur);
            cur = cur->next;
        }
        
        return;
    }else{
        fprintf(stderr, "ERROR: Null Node!");
        return;
    }
}

int main(int argc, char **argv) {

    char *docname;
        
    if (argc <= 1) {
        printf("Usage: %s docname\n", argv[0]);
        return(0);
    }

    docname = argv[1];
    currentNode = parseDoc (docname);
    //printf("Root Node: %s\n", currentNode->name);

    printChildrenNames(currentNode);
    return (1);
}