In TinyXml 1 it was possible to convert a child element to a string using the << operator, e.g.
TiXmlElement * pxmlChild = pxmlParent->FirstChildElement( "child" );
std::stringstream ss;
ss << (*pxmlChild);
This doesn't appear possible in TinyXml2. How do you convert an element to an xml string in TinyXml2?
Edit: Specifically I'm after the xml, e.g. if the xml was:
<parent>
<child>
<value>abc</value>
</child>
<parent>
I want the xml for the child element, e.g.
<child>
<value>abc</value>
</child>
Seems like Print isn't there any more but Accept works just as well:
XMLPrinter printer;
pxmlChild->Accept( &printer );
ss << printer.CStr();
From the TinyXml2 community:
Printing (of a sub-node) is in a utility function:
XMLPrinter printer;
pxmlChild->Print( &printer );
ss << printer.CStr();
TiXmlElement *assertion; // you can add some elements when you test
TiXmlPrinter printer;
assertion->Accept( &printer );
std::string stringBuffer = printer.CStr();
cout<<stringBuffer.c_str()<<endl;
Related
This question already has an answer here:
Reading an XML file using QXmlStreamReader
(1 answer)
Closed 6 years ago.
I have xml file in my local machine. The xml file format is like:
<string>
<Data>
<Name>Sanket</Name>
<Number>0987654321</Number>
<Address>India</Address>
</Data>
<Data>
<Name>Rahul</Name>
<Number>0987654321</Number>
<Address>Maharashtra</Address>
</Data>
</string>
I want to convert this XML file data into String format. Like:
Sanket 0987654321 India
Rahul 0987654321 Maharashtra
What is the easiest way to convert this data in QT using c++.
I am new in that, so please can anyone suggest me some sample code for this?
Thank you in advance.
I tried following code, but that not work for me:
void parseFile()
{
QList<QList<QString> > dataSet;
QString lastError = "";
QFile inFile("test.xml");
if (inFile.open(QIODevice::ReadOnly))
{
QTextStream fread(&inFile);
long totalSize = inFile.size();
QString line;
while(!fread.atEnd())
{
line = fread.readLine();
QList<QString> record = line.split(QString::KeepEmptyParts);
dataSet.append(record);
}
qDebug()<<dataSet;
}else{
lastError = "Could not open "+test.xml+" for reading";
}
}
You could parse the xml elements firstly via QXmlStreamReader and then you can assemble the xml elements into the string how you want.
The problem of you Code is that you only process the text Lines without any xml-syntax processed by the xml class.
You should look at the QtXML classes for which Florent Uguet provided some links.
However I modified the example found here to do what you want (It does that exact thing for your exact input):
#include <QDomDocument>
#include <QFile>
#include <iostream>
#include <QDomNodeList>
int main()
{
QDomDocument doc("mydocument");
QFile file("test.xml");
if (!file.open(QIODevice::ReadOnly))
return 1;
if (!doc.setContent(&file)) {
file.close();
return 1;
}
file.close();
const auto stringTags = doc.elementsByTagName("string");
for(int stringsI = 0; stringsI < stringTags.size(); ++stringsI){
QDomNode stringTag = stringTags.at(stringsI);
for(QDomNode dataTag = stringTag.firstChildElement("Data"); !dataTag.isNull(); dataTag = dataTag.nextSiblingElement("Data")){
for(QDomNode innerTag = dataTag.firstChild(); !innerTag.isNull(); innerTag = innerTag.nextSibling()){
auto val = innerTag.toElement().text();
std::cout << val.toStdString() << " ";
}
std::cout << std::endl;
}
}
return 0;
}
I build it with QtCreator using qmake. For this you should know that you need to put QT += xml in your *.pro file.
Already asked (and with code) : Reading an XML file using QXmlStreamReader
Qt provides a set of classes for handling XML :
http://doc.qt.io/qt-5.7/qtxml-index.html
http://doc.qt.io/qt-5.7/qxmlstreamreader.html
http://doc.qt.io/qt-5.7/qxmlstreamwriter.html
Old C++ classes (not maintained)
http://doc.qt.io/qt-5/qtxml-module.html
Once you have parsed your file using these, you can usually read the individual nodes' inner text or attributes.
I want to do the exact same thing as the guy in this question.
I want to convert an XML child element (and all of its children) to an XML string, so if the XML structure were
<parent>
<child>
<value>abc</value>
</child>
<parent>
I want the xml for the child element, e.g.
<child>
<value>abc</value>
</child>
I don't care about whitespace. The problem is that the accepted answer from the other question appears to be out of date, because there is no "Print" method for XMLElement objects. Can I do this with TinyXml2?
I coded up the following function that does the trick for me. Please note that it may have bugs- I am working with very simple XML files, so I won't pretend that I have tested all cases.
void GenXmlString(tinyxml2::XMLElement *element, std::string &str)
{
if (element == NULL) {
return;
}
str.append("<");
str.append(element->Value());
str.append(">");
if (element->GetText() != NULL) {
str.append(element->GetText());
}
tinyxml2::XMLElement *childElement = element->FirstChildElement();
while (childElement != NULL) {
GenXmlString(childElement, str);
childElement = childElement->NextSiblingElement();
}
str.append("</");
str.append(element->Value());
str.append(">");
}
My test.xml like this:
<?xml version="1.0"?>
<!DOCTYPE PLAY SYSTEM "play.dtd">
<data>
<CurrentLevel>5</CurrentLevel>
<BestScoreLV1>1</BestScoreLV1>
<BestScoreLV2>2</BestScoreLV2>
</data>
<dict/>
My Code here:
std::string fullPath = CCFileUtils::sharedFileUtils()->fullPathFromRelativePath("text.xml");
tinyxml2::XMLDocument doc;
doc.LoadFile(fullPath.c_str());
tinyxml2::XMLElement* ele = doc.FirstChildElement("data")->FirstChildElement("BestScoreLV2")->ToElement();
ele->SetAttribute("value", 10);
doc.SaveFile(fullPath.c_str());
const char* title1 = doc.FirstChildElement("data")->FirstChildElement("BestScoreLV2")->GetText();
int level1 = atoi(title1);
CCLOG("result is: %d",level1);
But value of BestScoreLV2 when output is also 2. How can I change and write data to XML?
In TinyXML2 text is represented by XMLText class which is child of XMLNode class.
XMLNode have methods Value() and SetValue() which have different meanings for different XML nodes.
For text nodes Value() read node's text and SetValue() write it.
So you need code like this:
tinyxml2::XMLNode* value = doc.FirstChildElement("data")->
FirstChildElement("BestScoreLV2")->FirstChild();
value->SetValue("10");
The first child of BestScoreLV2 element is XMLText with value 2. You change this value to 10 by calling SetValue(10).
Hi
I want to use XML file as a config file, from which I will read parameters for my application. I came across on PugiXML library, however I have problem with getting values of attributes.
My XML file looks like that
<?xml version="1.0"?>
<settings>
<deltaDistance> </deltaDistance>
<deltaConvergence>0.25 </deltaConvergence>
<deltaMerging>1.0 </deltaMerging>
<m> 2</m>
<multiplicativeFactor>0.7 </multiplicativeFactor>
<rhoGood> 0.7 </rhoGood>
<rhoMin>0.3 </rhoMin>
<rhoSelect>0.6 </rhoSelect>
<stuckProbability>0.2 </stuckProbability>
<zoneOfInfluenceMin>2.25 </zoneOfInfluenceMin>
</settings>
To pare XML file I use this code
void ReadConfig(char* file)
{
pugi::xml_document doc;
if (!doc.load_file(file)) return false;
pugi::xml_node tools = doc.child("settings");
//[code_traverse_iter
for (pugi::xml_node_iterator it = tools.begin(); it != tools.end(); ++it)
{
cout<<it->name() << " " << it->attribute(it->name()).as_double();
}
}
and I also was trying to use this
void ReadConfig(char* file)
{
pugi::xml_document doc;
if (!doc.load_file(file)) return false;
pugi::xml_node tools = doc.child("settings");
//[code_traverse_iter
for (pugi::xml_node_iterator it = tools.begin(); it != tools.end(); ++it)
{
cout<<it->name() << " " << it->value();
}
}
Attributes are loaded corectly , however all values are equals 0. Could somebody tell me what I do wrong ?
I think your problem is that you're expecting the value to be stored in the node itself, but it's really in a CHILD text node. A quick scan of the documentation showed that you might need
it->child_value()
instead of
it->value()
Are you trying to get all the attributes for a given node or do you want to get the attributes by name?
For the first case, you should be able to use this code:
unsigned int numAttributes = node.attributes();
for (unsigned int nAttribute = 0; nAttribute < numAtributes; ++nAttribute)
{
pug::xml_attribute attrib = node.attribute(nAttribute);
if (!attrib.empty())
{
// process here
}
}
For the second case:
LPCTSTR GetAttribute(pug::xml_node & node, LPCTSTR szAttribName)
{
if (szAttribName == NULL)
return NULL;
pug::xml_attribute attrib = node.attribute(szAttribName);
if (attrib.empty())
return NULL; // or empty string
return attrib.value();
}
If you want stock plain text data into the nodes like
<name> My Name</name>
You need to make it like
rootNode.append_child("name").append_child(node_pcdata).set_value("My name");
If you want to store datatypes, you need to set an attribute. I think what you want is to be able to read the value directly right?
When you are writing the node,
rootNode.append_child("version").append_attribute("value").set_value(0.11)
When you want to read it,
rootNode.child("version").attribute("version").as_double()
At least that's my way of doing it!
yester day was my first attempt. I am trying to catch the variable "time" in the following "new.xml" file
<?xml version="1.0" standalone=no>
<main>
<ToDo time="1">
<Item priority="1"> Go to the <bold>Toy store!</bold></Item>
<Item priority="2"> Do bills</Item>
</ToDo>
<ToDo time="2">
<Item priority="1"> Go to the Second<bold>Toy store!</bold></Item>
</ToDo>
</main>
Here is my code
TiXmlDocument doc("new.xml");
TiXmlNode * element=doc.FirstChild("main");
element=element->FirstChild("ToDo");
string temp=static_cast<TiXmlElement *>(element)->Attribute("time");
But I am getting run time errors from the third and fourth lines. Can anybody shed a light on this isssue?
It seems to me that you forgot to load the file. Normally I do something along these lines:
TiXmlDocument doc("document.xml");
bool loadOkay = doc.LoadFile(); // Error checking in case file is missing
if(loadOkay)
{
TiXmlElement *pRoot = doc.RootElement();
TiXmlElement *element = pRoot->FirstChildElement();
while(element)
{
string value = firstChild->Value(); // In your example xml file this gives you ToDo
string attribute = firstChild->Attribute("time"); //Gets you the time variable
element = element->NextSiblingElement();
}
}
else
{
//Error conditions
}
Hope this helps
#include "tinyXml/tinyxml.h"
const char MY_XML[] = "<?xml version='1.0' standalone=no><main> <ToDo time='1'> <Item priority='1'> Go to the <bold>Toy store!</bold></Item> <Item priority='2'> Do bills</Item> </ToDo> <ToDo time='2'> <Item priority='1'> Go to the Second<bold>Toy store!</bold></Item> </ToDo></main>";
void main()
{
TiXmlDocument doc;
TiXmlHandle docHandle(&doc);
const char * const the_xml = MY_XML;
doc.Parse(MY_XML);
TiXmlElement* xElement = NULL;
xElement = docHandle.FirstChild("main").FirstChild("ToDo").ToElement();
int element_time = -1;
while(xElement)
{
if(xElement->QueryIntAttribute("time", (int*)&element_time) != TIXML_SUCCESS)
throw;
xElement = xElement->NextSiblingElement();
}
}
That's how it works. Compiled & tested.
As you can see your tries to make it extra-safe code cost you with an exceotion at your third line (of the question), and without testing I can bet it's a "pointing-to-null" exception.
Just load it my style, as TinyXml's docs say as well: "docHandle.FirstChild("main").FirstChild("ToDo").ToElement();".
Hope it helps you understand, let me know if it's not clear. I accept visa (:
Is it just me or the the pugixml version looks much better?
#include <iostream>
#include "pugixml.hpp"
using namespace std;
using namespace pugi;
int main()
{
xml_document doc;
if (!doc.load_file("new.xml"))
{
cerr << "Could not load xml";
return 1;
}
xml_node element = doc.child("main");
element = element.child("ToDo");
cout << "Time: " << element.attribute("time") << endl;
}
Also new.xml had an error, instead of:
<?xml version="1.0" standalone=no>
should be
<?xml version="1.0" standalone="no"?>
Compilation was just a matter of cl test.cpp pugixml.cpp