libxml2的不容获得节点内容 [英] libxml2 can´t get content from node

问题描述

我用的用C的libxml，这是我如何创建XML：

I am using libxml in C and this is how I create xml:

xmlDocPtr createXmlSegment(char *headerContent, char *dataContent)
{
  xmlDocPtr doc;
  doc = xmlNewDoc(BAD_CAST "1.0");
  xmlNodePtr rdt, header, data;
  rdt = xmlNewNode(NULL, BAD_CAST "rdt-segment");
  xmlSetProp(rdt, "id", "1");
  header = xmlNewNode(NULL,BAD_CAST "header");
  data = xmlNewNode(NULL, BAD_CAST "data");
  xmlNodeSetContent(header, BAD_CAST headerContent);
  xmlNodeSetContent(data, BAD_CAST dataContent);
  xmlAddChild(rdt, header);
  xmlAddChild(rdt, data);
  xmlDocSetRootElement(doc, rdt);
  return doc;
}

这是我多么希望得到从XML数据：

and this is how I want get data from that xml:

int getDataFromXmlSegment(char *data, char *header, char *content)
{
  xmlDocPtr doc = xmlReadMemory(data, strlen(data), NULL, NULL, XML_PARSE_NOBLANKS);
  xmlNode *rdt = doc->children;
  xmlNode *headerNode = rdt->children;
  header = (char *)headerNode->content;
  content = (char *)headerNode->next->content;
  printf("header: %s, content: %s", header, content);
  return EXIT_SUCCESS;
}

当我测试headerNode->名称或 - >下一步 - >名称，则名称是正确的（即汇入作业元素的名称），但内容返回null。任何人都知道在哪里的问题？

When I test headerNode->name or ->next->name then the names are correct (it´s names of that elements) but content returns null. Anyone knows where is problem?

推荐答案

简短的回答：使用 xmlNodeGetContent

元素节点本身不包含的内容。相反，他们有孩子文本节点，以及那些包含内容。元素的内容可以是文本和标记​​的混合，这使得它保持排序，再present实体等。

Element nodes themselves don't contain content. Instead, they have children text nodes, and those contain content. The contents of an element may be a mix of text and tags, and this allows it to maintain the ordering, represent entities, etc.

您可以遍历子节点，并期待在他们的内容成员，但xmlNodeGetContent会替你，会处理子标签和实体正确的。

You could iterate over the child nodes and look at THEIR content members, but xmlNodeGetContent does that for you, and will handle child tags and entities properly.

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