Xerces C++ help in GetNodeValue(). Beginner question....

[David (120)]

Hello ,
I'm trying to parse an XML document a get spicific tags such as email in the code below. I'm using xerces 2.4. However I don't manage to get the value for the email. Can anybody help.

thanks in advance,

david

This the output of the piece of code below

Index:0 Value:0
Index:1 Value:0
Index:2 Value:0
Index:3 Value:0
Index:4 Value:0
Index:5 Value:0

This the XML file:

<?xml version="1.0" encoding="UTF-8"?>
<?proc-inst-1 'foo' ?>
<personnel xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation='personal.xsd'>

<person id="Big.Boss">
<name xml:base="foo/bar"><family xml:base="bar/bar">Boss</family> <given xml:base="car/bar">Big</given><?proc-inst-2 'foobar' ?></name> <email></email> <link subordinates="one.worker two.worker three.worker four.worker five.worker"/> </person>

<person id="one.worker" xml:base="/auto/bar">
<name xml:base="/car/foo/"><family xml:base="bar/bar">Worker</family> <given>One</given></name> <email></email> <link manager="Big.Boss"/> </person>

<person id="two.worker" xml:base="http://www.example.com/car/car"> <name xml:base="/bar/foo/"><family xml:base="foo/bar">Worker</family> <given>Two</given></name> <email></email> <link manager="Big.Boss"/> </person>

<person id="three.worker">
<name><family>Worker</family> <given>Three</given></name> <email></email> <link manager="Big.Boss"/> </person>

<person id="four.worker">
<name><family>Worker</family> <given>Four</given></name> <email></email> <link manager="Big.Boss"/> </person>

<person id="five.worker">
<name><family>Worker</family> <given>Five</given></name> <email></email> <link manager="Big.Boss"/> </person>

</personnel>

This is a piece of the code

Main.cpp
........
DOMDocument *doc = parser->getDocument;
DOMElement *root = doc->getDocumentElement;
DOMNode *node;
XMLCh* tmpstr;
int len;
int i;

XMLString::transcode("email", tmpstr ,50);

DOMNodeList *list = doc->getElementsByTagName(tmpstr);
len = list->getLength;

for (i=0; i< len ;i++)
{
//Returns DOMnode object
node = list->item(i);

const XMLCh* n = node->getNodeValue;
cout << "Index:" << i << " Value:" << n <<endl;

}

delete parser;
delete errHandler;

XMLPlatformUtils::Terminate;

return 0;

}

 

[Toni Uusitalo]

I think you must get the value of text node (remember "in DOM everything is a node", thus text is also node) which in your case is firstChild of your email element i.e. something like:
node.firstChild.NodeValue
(inside your loop)

with respect,
Toni Uusitalo

 

[David (120)]

I have modified the code as follows but still doesn't work. ANy idea ?

cout << "LIST:" << len <<endl;
for (i=0; i< len ;i++)
{
//Returns DOMnode object
node = list->item(i);
const XMLCh* test = node->getFirstChild->getNodeValue;
cout << "Index:" << i << " Value:" << test <<" Type:" <<endl;

}

I get:
Index:0 Value:0x806f6f8
Index:1 Value:0x8070140
Index:2 Value:0x8070b28
Index:3 Value:0x8071290
Index:4 Value:0x80719f8
Index:5 Value:0x8072158

ANy idea ???

 

[Toni Uusitalo]

Hmm. at least it seems like test is now pointing to some string/somewhere (DOMstring?), we're getting closer. ;-)

check last two functions in this:

http://www.diku.dk/hjemmesider/studerende/mccash/speciale/src/sb2/Parser.cpp.html

they will help you to get textNodes from mixed content, should be useful. You might have to transcode your DOMstring nodeValue to appropriate C++ type, I don't know anything about Xerces-C must admit nor I don't use C++ much. Maybe there's some example demonstrating this in Xerces docs?

with respect,
Toni Uusitalo

 

[Toni Uusitalo]

I browsed Xerces-C docs abit
(http://xml.apache.org/xerces-c/ApacheDOMC++BindingL3.html) and noticed that there's function getTextContent. This is DOM 3 feature I believe, it doesn't hurt to get used to the idea that "everything is a node" though - that's the way DOM works.