var io = {
	openPath : function() {

		const
		nsIFilePicker = Components.interfaces.nsIFilePicker;

		var fp = Components.classes["@mozilla.org/filepicker;1"]
				.createInstance(nsIFilePicker);
		fp.init(window, "Dialog Title", nsIFilePicker.modeOpen);
		fp.appendFilters(nsIFilePicker.filterAll | nsIFilePicker.filterText);
		var rv = fp.show();
		if (rv == nsIFilePicker.returnOK || rv == nsIFilePicker.returnReplace) {
			var file = fp.file;
			// Get the path as string. Note that you usually won't
			// need to work with the string paths.
			var path = fp.file.path;
			// work with returned nsILocalFile...
		}
		return path;
	},
	appendPath : function(path, contents) {
		alert("appended File");
		var file1 = Components.classes["@mozilla.org/file/local;1"]
				.createInstance(Components.interfaces.nsILocalFile);
		file1.initWithPath(path);
		// alert("append file nullcheck: "+file1.toString());
		var foStream = Components.classes["@mozilla.org/network/file-output-stream;1"]
				.createInstance(Components.interfaces.nsIFileOutputStream);
		// use 0x02 | 0x10 to open file for appending.
		foStream.init(file1, 0x02 | 0x10, 438, 0);
		var converter = Components.classes["@mozilla.org/intl/converter-output-stream;1"]
				.createInstance(Components.interfaces.nsIConverterOutputStream);
		converter.init(foStream, "UTF-8", 0, 0);
		converter.writeString(contents);
		converter.close();
	},
	newPath : function(path) {

		const
		nsIFilePicker = Components.interfaces.nsIFilePicker;

		var fp = Components.classes["@mozilla.org/filepicker;1"]
				.createInstance(nsIFilePicker);
		fp.init(window, "Dialog Title", nsIFilePicker.modeSave);
		fp.appendFilters(nsIFilePicker.filterAll | nsIFilePicker.filterText);

		var rv = fp.show();
		if (rv == nsIFilePicker.returnOK || rv == nsIFilePicker.returnReplace) {
			var file = fp.file;
			// Get the path as string. Note that you usually won't
			// need to work with the string paths.
			var path = fp.file.path;
			// work with returned nsILocalFile...

		}
		return path;
	},
	createFile : function(path) {

		alert("created File");
		var file1 = Components.classes["@mozilla.org/file/local;1"]
				.createInstance(Components.interfaces.nsILocalFile);
		file1.initWithPath(path);

		var foStream = Components.classes["@mozilla.org/network/file-output-stream;1"]
				.createInstance(Components.interfaces.nsIFileOutputStream);
		// use 0x02 | 0x10 to open file for appending.
		foStream.init(file1, 0x02 | 0x08 | 0x20, 438, 0);
		var converter = Components.classes["@mozilla.org/intl/converter-output-stream;1"]
				.createInstance(Components.interfaces.nsIConverterOutputStream);
		converter.init(foStream, "UTF-8", 0, 0);

		converter.close(); // this closes foStream
	},
	getLine : function(path) {
		// open an input stream from file

		var file = Components.classes["@mozilla.org/file/local;1"]
				.createInstance(Components.interfaces.nsILocalFile);
		file.initWithPath(path);
		var istream = Components.classes["@mozilla.org/network/file-input-stream;1"]
				.createInstance(Components.interfaces.nsIFileInputStream);
		istream.init(file, 0x01, 0444, 0);
		istream.QueryInterface(Components.interfaces.nsILineInputStream);

		// read lines into array
		var line = {}, lines = [], hasmore;
		do {
			hasmore = istream.readLine(line);
			lines.push(line.value);
		} while (hasmore);

		istream.close();

		// do something with read data
		return lines;
	}
}