C++ Pugixml get children of parent by attribute id - c++

For example:
<levels>
<level id="1">
<somestuff></somestuff>
</level>
<level id="2">
<somestuff></somestuff>
</level>
</levels>
How do you get the data of level with id 1?
Now i am using pugi::xml_node level = levels.child("level") But that return all levels..
Regards,
GJJ


levels.find_child_by_attribute("level", "id", "1")


Try it:
for (pugi::xml_node ambil = doc.child("levels").child("level"); ambil; ambil = ambil.next_sibling("level"))
{
int id = ambil.attribute("id").as_int();
CCLog("%d",id);
}


foreach children & compare attribute value.
e.g.
for (const auto& node : levels.children("level"))
{
if (node.attribute("id").as_int() == 1)
{
// TODO: add ur code here
}
}

Related

Remove child nodes from parent - PugiXML

<Node>
<A>
<B id = "it_DEN"></B>
</A>
<A>
<B id = "en_KEN"></B>
</A>
<A>
<B id = "it_BEN"></B>
</A>
</Node>
How can I remove child node of <A></A> that has child node <B></B> which has attribute id not starts with it using PugiXML.
The result would be as below:
<Node>
<A>
<B id = "it_DEN"></B>
</A>
<A>
<B id = "it_BEN"></B>
</A>
</Node>

This is slightly tricky if you want to remove nodes while iterating (to keep the code single-pass). Here's one way to do it:
bool should_remove(pugi::xml_node node)
{
const char* id = node.child("B").attribute("id").value();
return strncmp(id, "it_", 3) != 0;
}
for (pugi::xml_node child = doc.child("Node").first_child(); child; )
{
pugi::xml_node next = child.next_sibling();
if (should_remove(child))
child.parent().remove_child(child);
child = next;
}
Alternatively you can just use XPath and remove the results:
pugi::xpath_node_set ns = doc.select_nodes("/Node/A[B[not(starts-with(#id, 'it_'))]]");
for (auto& n: ns)
n.node().parent().remove_child(n.node());

Another way is to increment the iterator before removing the child. To remove an attribute while iterating.
for(pugi::xml_attribute_iterator it = node.attributes_begin(); it != node.attributes_end();){
pugi::xml_attribute attr = *it++;
if(should_remove(attr)){
node.remove_attribute(attr);
}
}

Reading child node of a child node

Below i have show a normal XML file:
<Header>
<Sub Name="" Value="" /Sub>
<Sub Name="" value="" /Sub>
.
.
.
.
</Header>
I read the above mentioned XML like this:
QStringList Name;
QStringList value;
QXmlGet xmlget;
xmlget.load(Sample.xml);
xmlget.findAndDescend("Header");
while(xmlget.findNext("Sub")
{
Name.append(xmlget.getAttributeString("Name". "Unknown"));
value.append(xmlget.getAttributeString("value". "Unknown"));
}
xmlget.save(Sample.xml);
But the xml i have right now is bit complicated.
XML:
<Header>
<Sub Name= "" Value = ""><Sub1 Name = ""></Sub1></Sub>
<Sub Name= "" value = "" /Sub>
<Sub Name= "" Value = ""><Sub1 Name = ""></Sub1></Sub>
.
.
.
</Header>
Any suggestions how do I read the <Sub1>

Something like this one (Tested! It works!)
QStringList Name;
QStringList value;
QXmlGet xmlget;
xmlget.load("Sample.xml");
xmlget.findAndDescend("Header");
QXmlPut xmlPut(xmlget); // init reference from the variable - xmlget
while(xmlget.findNext("Sub")) {
Name.append(xmlget.getAttributeString("Name", "Unknown"));
value.append(xmlget.getAttributeString("Value", "Unknown"));
xmlget.descend(); // now Sub is the parent element
if( xmlPut.hasChildren() ) {
while(xmlget.findNext("Sub1") { // finding relatively the parent - Sub
xmlPut.goTo(xmlget.element());
xmlPut.setAttributeString("Name", "NAME1");
xmlPut.setAttributeString("Value", "VALUE1");
}
} else {
xmlPut.putInt("IntTag", "IntValue"); // We create the child node (IntTag) of the parent (Sub)
xmlPut.setAttributeString("AttrName", "AttrValue"); // and add some attributes to it
}
xmlget.rise();
}
xmlPut.save("Sample.xml"); // Any file name to save the xml data
docs

Getting Specific Attribute of XML file

I need to get a attribute of subchild, the tags of Subchild are all same, I need to Differentiate with the attribute's name .
XML:
<HEADER>
<TITLE>title</TITLE>
<AUTOR>DNL</AUTOR>
<PLATFORM>Windows</PLATFORM>
<TEST_ENV>HiL</TEST_ENV>
</Header>
<VARIABLES>
<VAR Name="ABC" Value="1hhh4"></VAR>
<VAR Name="EFG" Value="343hkn"></VAR>
<VAR Name="IHJ" Value="1asds12" ></VAR>
<VAR Name="LMO" Value="43hjjn"></VAR>
<VAR Name="PQR" Value="1sdf43"></VAR>
<VARIABLES>
Code until now:
void MainWindow::StartUpScriptSetter(QString xmlpath)
{
QString Title;
QString Platform;
QString Author;
QString TEST;
xmlget.load(xmlpath);
xmlget.findAndDescend("HEADER");
if(xmlget.find("TITLE"))
{
startup = xmlget.getString();
}
if(xmlget.find("PLATFORM"))
{
ini = xmlget.getString();
}
if(xmlget.find("AUTHOR"))
{
zbf_file = xmlget.getString();
}
if(xmlget.find("TEST_ENV"))
{
zbf_root = xmlget.getString();
}
xmlget.save(xmlpath)
}
until now I have successfully fetched all Attributes of HEADER, i want only specific attributes of VARIABLES
I need the value attribute of Name = LMO. How do I do it?

if(xmlget.findAndDescend("VARIABLES")) {
if(xmlget.find("VAR")) {
QString name = xmlget.getAttributeString("Name", "");
if(!name.isEmpty() && name.compare("What you are looking for") == 0)
QString value = xmlget.getAttributeString("Value");
}
}

How to delete nested xml element using qt

i have xml file like this
<root>
<element>
<child id = "0"> Some Text </child> <-- Target To Delete
</element>
<element>
<child id = "1"> Some Text </child>
</element>
</root>
how can i delete child element of id "0" ? using Qt library.

QDomDocument doc;
doc.setContent(oldXml);
QDomNodeList nodes = doc.elementsByTagName("element");
for (int i = 0; i < nodes.count(); ++i)
{
QDomNode node = nodes.at(i);
QDomElement child = node.firstChildElement("child");
if (!child.isNull() && child.attribute("id") == "0")
{
node.removeChild(child);
}
}
QString newXml = doc.toString();

Xpath How remove child node by attribute c++ libxml2

How do I remove a child with a specific attribute? I´m using c++/libxml2. My attempt so far (in the example I want to remove child node with id="2"):
Given XML:
<p>
<parent> <--- current context
<child id="1" />
<child id="2" />
<child id="3" />
</parent>
</p>
xmlNodePtr p = (parent node)// Parent node, in my example "current context"
xmlChar* attribute = (xmlChar*)"id";
xmlChar* attribute_value = (xmlChar*)"2";
xmlChar* xml_str;
for(p=p->children; p!=NULL; p=p->next){
xml_str = xmlGetProp(p, attribute);
if(xml_str == attribute_value){
// Remove this node
}
}
xmlFree(xml_str);

Call xmlUnlinkNode to remove a node. Call xmlFreeNode to free it afterward, if you want:
for (p = p->children; p; ) {
// Use xmlStrEqual instead of operator== to avoid comparing literal addresses
if (xmlStrEqual(xml_str, attribute_value)) {
xmlNodePtr node = p;
p = p->next;
xmlUnlinkNode(node);
xmlFreeNode(node);
} else {
p = p->next;
}
}

Haven't used this library in a while, but check out this method. Note that per the description, you need to call xmlUnlinkNode first.