A TiXmlHandle is a class that wraps a node pointer with null checks; this is an incredibly useful thing. More...
#include <tinyxml.h>
| Public Member Functions | |
| TiXmlHandle (TiXmlNode *_node) | |
| Create a handle from any node (at any depth of the tree.) This can be a null pointer. | |
| TiXmlHandle (const TiXmlHandle &ref) | |
| Copy constructor. | |
| TiXmlHandle | FirstChild () const | 
| Return a handle to the first child node. | |
| TiXmlHandle | FirstChild (const char *value) const | 
| Return a handle to the first child node with the given name. | |
| TiXmlHandle | FirstChildElement () const | 
| Return a handle to the first child element. | |
| TiXmlHandle | FirstChildElement (const char *value) const | 
| Return a handle to the first child element with the given name. | |
| TiXmlHandle | Child (const char *value, int index) const | 
| Return a handle to the "index" child with the given name. | |
| TiXmlHandle | Child (int index) const | 
| Return a handle to the "index" child. | |
| TiXmlHandle | ChildElement (const char *value, int index) const | 
| Return a handle to the "index" child element with the given name. | |
| TiXmlHandle | ChildElement (int index) const | 
| Return a handle to the "index" child element. | |
| TiXmlNode * | ToNode () const | 
| Return the handle as a TiXmlNode. | |
| TiXmlElement * | ToElement () const | 
| Return the handle as a TiXmlElement. | |
| TiXmlText * | ToText () const | 
| Return the handle as a TiXmlText. | |
| TiXmlUnknown * | ToUnknown () const | 
| Return the handle as a TiXmlUnknown. | |
| TiXmlNode * | Node () const | 
| TiXmlElement * | Element () const | 
| TiXmlText * | Text () const | 
| TiXmlUnknown * | Unknown () const | 
A TiXmlHandle is a class that wraps a node pointer with null checks; this is an incredibly useful thing.
Note that TiXmlHandle is not part of the TinyXml DOM structure. It is a separate utility class.
Take an example:
<Document> <Element attributeA = "valueA"> <Child attributeB = "value1" /> <Child attributeB = "value2" /> </Element> <Document>
Assuming you want the value of "attributeB" in the 2nd "Child" element, it's very easy to write a *lot* of code that looks like:
	TiXmlElement* root = document.FirstChildElement( "Document" );
	if ( root )
	{
		TiXmlElement* element = root->FirstChildElement( "Element" );
		if ( element )
		{
			TiXmlElement* child = element->FirstChildElement( "Child" );
			if ( child )
			{
				TiXmlElement* child2 = child->NextSiblingElement( "Child" );
				if ( child2 )
				{
					// Finally do something useful.
	And that doesn't even cover "else" cases. TiXmlHandle addresses the verbosity of such code. A TiXmlHandle checks for null pointers so it is perfectly safe and correct to use:
	TiXmlHandle docHandle( &document );
	TiXmlElement* child2 = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", 1 ).ToElement();
	if ( child2 )
	{
		// do something useful
	Which is MUCH more concise and useful.
It is also safe to copy handles - internally they are nothing more than node pointers.
TiXmlHandle handleCopy = handle;
What they should not be used for is iteration:
	int i=0; 
	while ( true )
	{
		TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", i ).ToElement();
		if ( !child )
			break;
		// do something
		++i;
	}
	It seems reasonable, but it is in fact two embedded while loops. The Child method is a linear walk to find the element, so this code would iterate much more than it needs to. Instead, prefer:
	TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).FirstChild( "Child" ).ToElement();
	for( child; child; child=child->NextSiblingElement() )
	{
		// do something
	}
	| TiXmlHandle TiXmlHandle::Child | ( | int | index | ) | const | 
Return a handle to the "index" child.
The first child is 0, the second 1, etc.
| TiXmlHandle TiXmlHandle::Child | ( | const char * | value, | |
| int | index | |||
| ) | const | 
Return a handle to the "index" child with the given name.
The first child is 0, the second 1, etc.
| TiXmlHandle TiXmlHandle::ChildElement | ( | int | index | ) | const | 
Return a handle to the "index" child element.
The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.
| TiXmlHandle TiXmlHandle::ChildElement | ( | const char * | value, | |
| int | index | |||
| ) | const | 
Return a handle to the "index" child element with the given name.
The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.
| TiXmlElement* TiXmlHandle::Element | ( | ) | const  [inline] | 
References ToElement().
| TiXmlNode* TiXmlHandle::Node | ( | ) | const  [inline] | 
References ToNode().
| TiXmlText* TiXmlHandle::Text | ( | ) | const  [inline] | 
References ToText().
| TiXmlElement* TiXmlHandle::ToElement | ( | ) | const  [inline] | 
| TiXmlNode* TiXmlHandle::ToNode | ( | ) | const  [inline] | 
| TiXmlText* TiXmlHandle::ToText | ( | ) | const  [inline] | 
| TiXmlUnknown* TiXmlHandle::ToUnknown | ( | ) | const  [inline] | 
| TiXmlUnknown* TiXmlHandle::Unknown | ( | ) | const  [inline] | 
References ToUnknown().
 1.6.2
 1.6.2