使用PugiXML进行XML解析,无限循环 [英] XML parsing with PugiXML, infinite loop
问题描述
这几乎是我编写的第一个C ++程序,它应在文档中显示xml节点列表.我使用TinyXML进行了完全相同的操作,但是我发现Pugi更好,并且希望继续使用它.
this is pretty much the first C++ program that I ever made, it should display a list of xml nodes in the document. I made an exact same thing work using TinyXML, but I find Pugi much nicer and would like to continue using it.
程序代码:
#include <iostream>
#include <string>
#include <vector>
using namespace std;
#include "pugixml/src/pugixml.hpp"
#include "pugixml/src/pugiconfig.hpp"
#include "pugixml/src/pugixml.cpp"
using namespace pugi;
const char * identify(xml_node node)
{
const char * type;
switch(node.type())
{
case node_null:
type = "Null";
break;
case node_document:
type = "Document";
break;
case node_element:
type = "Element";
break;
case node_pcdata:
type = "PCDATA";
break;
case node_cdata:
type = "CDATA";
break;
case node_comment:
type = "Comment";
break;
case node_pi:
type = "Pi";
break;
case node_declaration:
type = "Declaration";
break;
case node_doctype:
type = "Doctype";
break;
default:
type = "Invalid";
}
return type;
}
void walk(xml_node parent)
{
printf("%s:\t%s\t%s\n", identify(parent), parent.name(), parent.value());
for(xml_node child = parent.first_child(); child != 0; child = parent.next_sibling())
{
walk(child);
}
}
int main(int argc, char* argv[])
{
for (int i=1; i<argc; i++)
{
xml_document doc;
xml_parse_result result = doc.load_file(argv[i]);
cout << argv[i] << ": " << result.description() << endl;
if (result)
{
walk(doc);
}
}
return 0;
}
示例XML:
<?xml version="1.0" encoding="iso-8859-1" standalone="yes"?>
<iOne>
<iTwo>
<iThree>
<one>1</one>
<two>2</two>
<three>3</three>
</iThree>
</iTwo>
<one>1</one>
<two>2</two>
<three>3</three>
</iOne>
代码有效,直到遇到两个<三个>
中的第一个并进入无限循环,这使我认为 for(xml_node child = parent.first_child(); child!= 0; child = parent.next_sibling())
,但是一切都与示例中的相同吗?我可能错过了一些显而易见的东西……尽管这是我在C ++中迈出的第一步:)
The code works until it comes across the first of the two <three>
s and goes into an infinite loop, which mades me think there is something wrong with condition in for(xml_node child = parent.first_child(); child != 0; child = parent.next_sibling())
but everything is the same as in examples? I probably missed something pretty obvious... these are my first baby steps in c++ though :)
我可以理解C ++中的NULL只是0,对吗?
I am given to understand NULL in C++ is just 0 right?
(很抱歉询问多个问题),这真的是对付Pugi的正确方法吗?对于C ++程序,我似乎不使用太多指针?我很困惑.
Also (sorry for asking multiple questions), is this really a correct way of doing stuff with pugi? For a C++ program, I dont seem to be using pointers much? Im confused.
推荐答案
您是否尝试过将 for
循环更改为:
Have you tried changing that for
loop to:
for(xml_node child = parent.first_child(); child; child = child.next_sibling())
这是示例的操作方式( traverse_base.cpp ).
This is how the samples do it (traverse_base.cpp for example).
重要的部分是 child = child.next_sibling()
,而不是 parent.next_sibling()
.
The important part is child = child.next_sibling()
, not parent.next_sibling()
.
这篇关于使用PugiXML进行XML解析,无限循环的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!