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Using DOM like XML parser [message #6474]

Mon, 13 November 2006 21:55

zsolt
Messages: 702
Registered: December 2005
Location: Budapest, Hungary

Contributor

I wanted to try DOM (Document Object Model) like XML processing with XmlNode class. I modified AddressBook example to use that.
Additionally I made some changes to use ArrayCtrl columns and XML in a more safe way.

Attachment: AddressBookXMLDOM.zip
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Re: Using DOM like XML parser [message #6475 is a reply to message #6474]

Mon, 13 November 2006 23:35

zsolt
Messages: 702
Registered: December 2005
Location: Budapest, Hungary

Contributor

For fast reference, this is the new Open method, loading, parsing the XML file and putting its content to the ArrayCtrl:

void AddressBook::Open()
{
	if(!fs.ExecuteOpen()) return;
	filename = fs;
	array.Clear();
	try {
		String d = LoadFile(filename);
		XmlNode n = ParseXML(d);
		if(n.GetCount()==0 || n[0].GetTag() != "AddressBook")
			throw XmlError("No AddressBook tag in ");
		const XmlNode &ab = n[0];
		array.SetCount(ab.GetCount());
		for(int i=0; i < ab.GetCount(); i++){
			const XmlNode &person = ab[i];
			for(int j=0; j < person.GetCount(); j++){
				const XmlNode &prop = person[j];
				if(prop.IsTag(TAG_NAME)) array.Set(i, TAG_NAME, prop[0].GetText());
				else if(prop.IsTag(TAG_SURNAME)) array.Set(i, TAG_SURNAME, prop[0].GetText());
				else if(prop.IsTag(TAG_ADDRESS)) array.Set(i, TAG_ADDRESS, prop[0].GetText());
				else if(prop.IsTag(TAG_EMAIL)) array.Set(i, TAG_EMAIL, prop[0].GetText());
			}
		}
	}
	catch(XmlError &e) {
		Exclamation("Error reading the input file:&" + DeQtf(e) );
	}
}

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Re: Using DOM like XML parser [message #6478 is a reply to message #6475]

Tue, 14 November 2006 00:41

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

Well, I must say you got me confused at first, but you are right - XmlNode is roughly equivalent of DOM...

Mirek

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Re: Using DOM like XML parser [message #6480 is a reply to message #6478]

Tue, 14 November 2006 00:59

mirek
Messages: 14255
Registered: November 2005

Ultimate Member

But the example is not perfect - you should reimplement Save as well Wink

Mirek

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Re: Using DOM like XML parser [message #6481 is a reply to message #6480]

Tue, 14 November 2006 02:05

zsolt
Messages: 702
Registered: December 2005
Location: Budapest, Hungary

Contributor

luzr wrote on Tue, 14 November 2006 00:59

But the example is not perfect - you should reimplement Save as well Wink

You are right Smile

void AddressBook::Save()
{
	if(IsEmpty(filename)) {
		SaveAs();
		return;
	}
	XmlNode n;
	XmlNode &ab = n.Add(TAG_ADDRESSBOOK);
	for(int i=0; i < array.GetCount(); i++)
	{
		XmlNode &person = ab.Add(TAG_PERSON);
		person.Add(TAG_NAME).Add().CreateText(array.Get(i, TAG_NAME));
		person.Add(TAG_SURNAME).Add().CreateText(array.Get(i, TAG_SURNAME));
		person.Add(TAG_ADDRESS).Add().CreateText(array.Get(i, TAG_ADDRESS));
		person.Add(TAG_EMAIL).Add().CreateText(array.Get(i, TAG_EMAIL));
	}
	if(!SaveFile(filename, AsXML(n)))
		Exclamation("Error saving the file!");
}