在Xerces-C中从DOMNode *传递到DOMElement * [英] Passing from a DOMNode* to a DOMElement* in Xerces-C

问题描述

我有一个操作xml的c ++应用程序。
嗯，在我的应用程序的某一点我得到一个DOMNode *，然后我把它附加到一个元素作为一个孩子。

问题是我想添加参数到该节点...它是一个节点，所以它不是一个元素...只有元素有参数...

这是我的代码：

  xercesc :: DOMNode * node = 0; 
 std :: string xml = from_an_obj_of_mine.GetXml（）; / *一个带有xml的字符串，xml确定一个元素在* / 
 xercesc :: MemBufInputSource xml_buf（（const XMLByte *）xml.c_str（），xml.size（），dummy） ; 
 xercesc :: XercesDOMParser * parser = new xercesc :: XercesDOMParser（）; 
 parser-> parse（xml_buf）; / *解析器将包含从字符串中解析好的DOMDocument，我在这里得到要附加的节点* / 
 node = my_pointer_to_a_preexisting_domdocument-> GetXmlDocument（） - > importNode（parser-> getDocument（） > getDocumentElement（），true）; / *我想将解析器中的节点附加到my_pointer_to_an_of_my_preexisting_domdocument的节点，它是一个不同的树，所以我必须导入节点以便以后附加* / 
 my_pointer_to_an_el_of_my_preexisting_domdocument-> appendChild（node）; 
  

如您所见，我想从字符串创建一个节点，我通过一个解析和那么需要导入节点来创建属于dom树的新的相同节点，我想附加新的节点。
我的步骤是：

• 获取xml字符串附加到一个预先存在的dom（存储为domdocument某个地方）




• 创建解析器




• 使用解析器从字符串




• 从我预先存在的dom（我要附加我的新节点），调用导入并克隆节点
  ，可以附加到预先存在的dom。




• 附加

问题是导入和导入会让我有一个节点...我想要一个元素来附加...

我使用appendChild来附加元素当然这个方法想要DOMNode *，但是给它一个DOMElement *（从DOMNode继承）就可以了...

如何获取元素从一个节点
删除wd_parser;

解决方案

确定我发现了...

只需将节点重定向到元素即可完成... DOMNode是一个纯虚拟类，它是DOMElement的父类，所以它是正确的，它也是做事的方式（逻辑上说）

  DOMElement * = dynamic_cast< DOMElement *>（node）; 
  

：）

I have a c++ application that manipulates xml. Well, at a certain point of my application I get a DOMNode* and then I attach it to an element as a child.

Well the problem is that I would like to add parameters to that node... well it is a node so it is not an element... only elements have parameters...

This is my code:

xercesc::DOMNode* node = 0;
std::string xml = from_an_obj_of_mine.GetXml(); /* A string with xml inside, the xml is sure an element having something inside */
xercesc::MemBufInputSource xml_buf((const XMLByte*)xml.c_str(), xml.size(), "dummy");
xercesc::XercesDOMParser* parser = new xercesc::XercesDOMParser();
parser->parse(xml_buf); /* parser will contain a DOMDocument well parsed from the string, I get here the node i want to attach */
node = my_pointer_to_a_preexisting_domdocument->GetXmlDocument()->importNode(parser->getDocument()->getDocumentElement(), true); /* I want to attach the node in parser to a node of my_pointer_to_an_el_of_my_preexisting_domdocument, it is a different tree, so I must import the node to attach it later */
my_pointer_to_an_el_of_my_preexisting_domdocument->appendChild(node);

As you can see I want to create a node from a string, I create it through a parse and then need to import the node to create a new identical node belonging to the dom tree where I want to attach the new node. My steps are:

• Get the xml string to attach to a pre-existing dom (stored as a domdocument somewhere)

• Create a parser

• Using the parser create a dom tree from the string

• From my pre-existing dom (where I want to attach my new node), call the import and clone the node so that it can be attached to the pre-existing dom.

• Attach it

The problem is that import and import gets me a node... I want an element to attach...

I use appendChild to append elements too... of course the method wants DOMNode* but giving it a DOMElement* (which inherits from DOMNode) is ok...

How can I get an element from a node??? delete wd_parser;

解决方案

ok I discovered it...

Just re-cast the node to element and it is done... DOMNode is a pure virtual class and it is parent of DOMElement... so it is correct and it is also the way to do things (logically speaking).

DOMElement* = dynamic_cast<DOMElement*>(node);

:)

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