Converting lat long to spatial reference

NhuMai

I'm trying to project some lat long coordinates into another spatial reference. No errors are thrown, but I printing the result to the console gives "undefined". Anyone see where I'm going wrong?

var lat = window.myMap.extent.getCenter().getLatitude().toFixed(2);
var long = window.myMap.extent.getCenter().getLongitude().toFixed(2);

var latLong = "Latitude : " + lat + " - Longitude : " + long;

var X;
var Y;

var rgpfSixSudSR = new SpatialReference ({
 wkid : 3297
 });
 var geometryService = new GeometryService("http://ourserver/arcgis/rest/services/Utilities/Geometry/GeometryServer");
 var inputPoint = new Point(lat, long, rgpfSixSudSR);
 var prjParams = new ProjectParameters ();
 prjParams.geometries = [inputPoint];
 prjParams.outSR = rgpfSixSudSR;

geometryService.project(prjParams, function (outputpoint) {
 console.log('Conversion completed');
 X = outputpoint[0].x;
 Y = outputpoint[0].y;
});

var center = "X : " + X + " - Y : " + Y;

console.log(latLong);
console.log(center);

NhuMai

So that defiitely looks applicable, thanks.. However, the only difference I see between this example and my code is that the "point" to be projected comes from the map click event.

In my case, the point is defined like this : 

var mercatorPoint = new Point(lat, long, webMercatorSR);

or

var mercatorPoint = new Point(center, webMercatorSR);

where the lat and long were defined like this : 

var lat = window.myMap.extent.getCenter().getLatitude().toFixed(2);.

or the center of extent defined like this :

var center = window.myMap.extent.getCenter()

I think that my issue stems from this original point to be projected. I don't have the possibility of retrieving the map point with a click event, because the goal is to set a customTextElement of a printed page with this information based on the image extent's center.

Printing window.myMap.extent.getCenter() gives me this:

Object
spatialReference:Object
latestWkid:3857
wkid:102100
__proto__:Object
type:"point"
x:-16765493.951994848
y:-1905537.634720398
__proto__:Object