在 Xerces-C 中从 DOMNode* 传递到 DOMElement*
我有一个操作 xml 的 C++ 应用程序。 好吧，在我的应用程序的某个时刻，我得到一个 DOMNode*，然后我将它作为子元素附加到一个元素。
好吧，问题是我想向该节点添加参数...好吧，它是一个节点，所以它不是一个元素...只有元素才有参数...
这是我的代码：
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);
如您所见，我想要从字符串创建一个节点，我通过解析创建它，然后需要导入该节点来创建属于我想要附加新节点的 dom 树的新的相同节点。 我的步骤是：
获取要附加到预先存在的 dom 的 xml 字符串（在某处作为 domdocument 存储）
- < p>创建一个解析器
使用解析器从字符串创建一个dom树
从我预先存在的dom（其中我想附加我的新节点），调用导入并克隆节点 这样它就可以附加到预先存在的 dom。
附加它
问题是导入和导入给我一个节点...我想要附加一个元素...
我也使用appendChild来附加元素...当然该方法需要DOMNode * 但给它一个 DOMElement* （继承自 DOMNode）就可以了...
我怎样才能从节点获取元素？？？ 删除wd_parser；
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;
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好吧我发现了...
只需将节点重新转换为元素即可完成...DOMNode 是一个纯虚拟类，它是 DOMElement 的父类...所以它是正确的，也是做事的方式（从逻辑上讲）。
:)
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).
:)