NS_ERROR_NOT_IMPLEMENTED exception in nsIPersistentProperties.save

[Tomas Rollo]

Hello to everybody,

I'm starting to write my first mozilla-based application to learn 
XUL/JS/XPCOM use etc. and I have found following problem:

I have written a wrapper-like class for dealing with properties, but 
when I call nsIPersistentProperties.save method of 
nsIPersistentProperties, I'm getting this exception:

[Exception... "Component returned failure code: 0x80004001 
(NS_ERROR_NOT_IMPLEMENTED) [nsIPersistentProperties.save]"  nsresult: 
"0x80004001 (NS_ERROR_NOT_IMPLEMENTED)"  location: "JS frame :: 
chrome://jam/content/class.Props.js :: anonymous :: line 28"  data: no]

Does that mean that the method is not implemented yet or am I doing 
something foolish? Here's the class code's snippet:

function Props() {
	this.fileName = "e:\jam.properties"; //local filename of the properties 
file
	try {
		this.properties = 
Components.classes["@mozilla.org/persistent-properties;1"].createInstance(Components.interfaces.nsIPersistentProperties);
	} catch (e) {
		alert("Got an exception: "+e.toString());
	}
}

Props.prototype.saveProps = function() {
	try {
		file = 
Components.classes["@mozilla.org/file/local;1"].createInstance(Components.interfaces.nsILocalFile);
		file.initWithPath(this.fileName);
		
		outStream = 
Components.classes["@mozilla.org/network/file-output-stream;1"].createInstance(Components.interfaces.nsIFileOutputStream);
		outStream.init(file,0x01,0644,null);
		
		this.properties.save(outStream,"JAM Settings"); //this is the line 
generating the exception
		
		inStream.close();
	} catch (e) {
		alert("Got an exception: "+e.toString());
	}
}

Thanks to everybody aiming me the right way.

Tomas R.

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