解析XML文件:根节点没有子节点 [英] Parsing XML files: Root Nodes has no child nodes
问题描述
我从没使用过XML和XML解析器,我想为OpenGL的模型动画解析COLLADA文档.
I never worked with XML and XML parsers and i wanted to parse a COLLADA document for model animation with OpenGL.
我正在使用tinyxml2解析器,看来我在做错什么.
I am using the tinyxml2 parser and it seems that I am doing something wrong with that.
XMLDocument _doc;
_doc.LoadFile(path.c_str());
XMLNode* pRoot = _doc.FirstChild();
XMLNode* pElement = pRoot->FirstChildElement("library_geometries");
我正在使用Xcode,并且在调试模式下,我可以看到pElement为NULL以及pRoot没有子节点.
I am working with Xcode and in debugging mode I can see, that pElement is NULL also that pRoot has got no child nodes.
推荐答案
在 tinyxml2
中,所有内容都是一个节点,而不仅仅是元素.因此, _doc.FirstChild()
没有帮助,因为它会将您带到< COLLADA>
元素(可能是XML标头中的一个属性)之前的节点.您想要的是文档中的第一个子元素,即< COLLADA>
,然后是文档下面的第一个< library_geometries>
元素.试试这个:
In tinyxml2
everything is a node, not just elements. So _doc.FirstChild()
is unhelpful as it's taking you to a node before the <COLLADA>
element (probably an attribute in the XML header). What you want is the first child element in the document, i.e. <COLLADA>
followed by the first <library_geometries>
element below it.
Try this:
#include "tinyxml2.h"
using namespace tinyxml2;
int main()
{
XMLDocument doc;
doc.LoadFile ("collada.xml");
auto colladaElement = doc .FirstChildElement();
auto lib_geomElement = colladaElement -> FirstChildElement("library_geometries");
return 0;
}
而且,如果您想获得更多的C ++ 11/14体验,可以尝试使用我的 tinyxml2扩展将上述内容减少为:
And, if you want more of a C++11/14 experience you could try my tinyxml2 extension which reduces the above to:
#include "tixml2ex.h"
int main()
{
tinyxml2::XMLDocument doc;
doc.LoadFile ("collada.xml");
auto lib_geomElement = find_element (doc, "COLLADA/library_geometries");
return 0;
}
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