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XML , DOM - Modify the tree [message #12133]

Fri, 12 October 2007 11:15

pippo
Messages: 17
Registered: October 2007
Location: Italy

Promising Member

hallo, I'm a newbe.
I need read a XML file and modify it.

I've seen the addressBookXML2. this example read a file and ,to rewrite it, re-CREATES ALL structure: starts from a new XmlNode object and fill it with Add().
This because function Node(int) returns a const XmlNode object.

But my XML files is very complex and I need modify only 1 value.

Why the dom-generated-tree is read only????
There's a function to modify it?

...Or copy some integer-block (nodes) to another tree, so I can create a new object and fill with copy... Very Happy

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Re: XML , DOM - Modify the tree [message #12135 is a reply to message #12133]

Fri, 12 October 2007 11:44

mirek
Messages: 13975
Registered: November 2005

Ultimate Member

pippo wrote on Fri, 12 October 2007 05:15

You can use following methods to modify XmlNode:

	XmlNode&       Add()                                      { return node.Add(); }
	void           AddText(const String& txt)                 { Add().CreateText(txt); }
	int            FindTag(const char *tag) const;
	XmlNode&       Add(const char *tag);
	XmlNode&       GetAdd(const char *tag);
	XmlNode&       operator()(const char *tag)                { return GetAdd(tag); }
	void           Remove(const char *tag);

Basically, it is only about using () instead of []...

Mirek

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Re: XML , DOM - Modify the tree [message #12141 is a reply to message #12135]

Fri, 12 October 2007 16:10

pippo
Messages: 17
Registered: October 2007
Location: Italy

Promising Member

luzr wrote on Fri, 12 October 2007 11:44

You can use following methods to modify XmlNode:

YES! I've discovered these just 15 minutes ago... Smile

At() methods is very nice, also.

---
Now I need to swap 2 nodes with all their sub-nodes. And/or insert a node between other nodes in a precise position (no append at end).

BEFORE:

<EatInSequence>
   <module>
      <thing value= "spaghetti"/>
   </module>
   <module>
      <thing value= "pizza"/>
   </module>
   <module>
      <thing value= "cheese cake"/>
   </module>
</EatInSequence>

AFTER:

<EatInSequence>
   <module>
      <thing value= "spaghetti"/>
   </module>
   <module>
      <thing value= "Beer"/>
   </module>
   <module>
      <thing value= "pizza"/>
   </module>
   <module>
      <thing value= "cheese cake"/>
   </module>
</EatInSequence>

I CAN'T CHANGE ONLY THE VALUE OF ATTRIB "value" (my first idea Laughing

), because this's only an exaple! In real my nodes are full of sub-nodes, then I must move sub and sub and sub nodes, too.

My onlyone solution found Embarassed

is:
1) read the old xml file
2) in dom-tree insert a my tag with progressive number
3) insert new tags (in append...) and mark it with position number needed.

<EatInSequence>
   <module>
      <thing value= "spaghetti"/>
      <myTag progr = "0">
   </module>
   <module>
      <thing value= "pizza"/>
      <myTag progr = "2">
   </module>
   <module>
      <thing value= "cheese cake"/>
      <myTag progr = "3">
   </module>
   <module>
      <thing value= "beer"/>
      <myTag progr = "1">
   </module>
</EatInSequence>

4) create a new tree, copying the nodes in correct sequence and deleting my tags with progressive number.
5) save.
Embarassed

Have you got a better solution?

Sorry for my english.....

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