From: "Dmitry B." <[EMAIL PROTECTED]>
Subject: Can't upload RDF data to Tree from C++
Date: Monday, October 20, 2003 8:09 PM
Hello, i have the xul demo "things" from XULPlanet which describe in the
bottom of this page.
And i need dynamicaly upload RDF data to tree from C++ code.
This is my C++ function:
nsresult __loadRDFDataToTree(nsIDOMXULElement *tree, const char *uri,
nsIString *RDFDataAsString)
{
nsCOMPtr<nsIRDFDataSource> dataSource;
dataSource =
do_CreateInstance("@mozilla.org/rdf/datasource;1?name=in-memory-datasource")
;
if (!dataSource)
return "Error: Can't create instance of datasource.";
nsCOMPtr<nsIRDFXMLParser> parser =
do_CreateInstance("@mozilla.org/rdf/xml-parser;1");
if (!parser)
return "Error: Can't create instance of RDF parser.";
nsCOMPtr<nsIURI> mURI;
// In this point uri = for example 'file:///things.rdf'
rv = NS_NewURI(getter_AddRefs(mURI), nsDependentCString(uri));
if (NS_FAILED(rv))
return "Error: Can't create mURI";
parser->ParseString(dataSource, mURI, RDFDataAsString);
nsCOMPtr<nsIXULTemplateBuilder> tempBuiler;
element->GetBuilder(getter_AddRefs(tempBuiler));
if (!tempBuiler)
return "Error: Can't get builder for tree";
nsCOMPtr<nsIRDFCompositeDataSource> compositeDataSource;
element->GetDatabase(getter_AddRefs(compositeDataSource));
if (!compositeDataSource)
return "Error: Can't get composite DataSource for tree";
compositeDataSource->AddDataSource(dataSource);
tempBuiler->Rebuild();
}
I am execute this procedure but my tree always is empty :(
Where is my mistake?
Regards, Dmitriy
<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin/" type="text/css"?>
<window id="treeRDF" title="RDF Tree"
xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul";>
<label value="Things in my house:"/>
<tree flex="1" width="350" height="200" id="testTree"
datasources="rdf:null" ref="urn:things:root">
<treecols>
<treecol id="name" label="Name" primary="true" flex="1"/>
<treecol id="material" label="Material" flex="1"/>
</treecols>
<template>
<treechildren>
<treeitem uri="rdf:*">
<treerow>
<treecell label="rdf:http://www.xulplanet.com/rdf/example#name"/>
<treecell
label="rdf:http://www.xulplanet.com/rdf/example#material"/>
</treerow>
</treeitem>
</treechildren>
</template>
</tree>
</window>
<?xml version="1.0"?>
<RDF:RDF xmlns:RDF="http://www.w3.org/1999/02/22-rdf-syntax-ns#";
xmlns:things="http://www.xulplanet.com/rdf/example#";>
<RDF:Description about="urn:things:kitchen" things:name="Kitchen"/>
<RDF:Description about="urn:things:bedroom" things:name="Bedroom"/>
<RDF:Description about="urn:things:basement" things:name="Basement"/>
<RDF:Description about="urn:things:toaster" things:name="Toaster"
things:material="Aluminum"/>
<RDF:Description about="urn:things:sink" things:name="Sink"
things:material="Steel"/>
<RDF:Description about="urn:things:spicerack" things:name="Spice Rack"
things:material="Cedar"/>
<RDF:Description about="urn:things:bed" things:name="Bed"
things:material="Oaks"/>
<RDF:Description about="urn:things:lavalamp" things:name="Lava Lamp"
things:material="Lava"/>
<RDF:Description about="urn:things:junk" things:name="Junk"
things:material="Unknown"/>
<RDF:Description about="urn:things:morejunk" things:name="More Junk"
things:material="Unknown"/>
<RDF:Description about="urn:things:coffin" things:name="Coffin"
things:material="Pine"/>
<RDF:Seq about="urn:things:root">
<RDF:li>
<RDF:Seq about="urn:things:kitchen">
<RDF:li resource="urn:things:toaster"/>
<RDF:li resource="urn:things:sink"/>
<RDF:li resource="urn:things:spicerack"/>
</RDF:Seq>
<RDF:Seq about="urn:things:bedroom">
<RDF:li resource="urn:things:bed"/>
<RDF:li resource="urn:things:lavalamp"/>
</RDF:Seq>
<RDF:Seq about="urn:things:basement">
<RDF:li resource="urn:things:junk"/>
<RDF:li resource="urn:things:morejunk"/>
<RDF:li resource="urn:things:coffin"/>
</RDF:Seq>
</RDF:li>
</RDF:Seq>
</RDF:RDF>
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