[OpenLayers-Dev] use of GetFeatureInfo with MapServer file

[jcbpro81]

Hello everyone,

I'm new with OpenLayers and MapServer.
I'm looking for a way to get informations on a feature clicked on a map,
like on the following link :
http://openlayers.org/dev/examples/getfeatureinfo-control.html

Here is my environment:
OpenLayers load only one layer of type "OpenLayers.Layer.MapServer".
The mapfile contains 4 postgis layers, and I want to be able to retrieve
informations from one of them.

Here is the JavaScript I have for now according to the GetFeatureInfo, code
found by looking on Google :

-------------------------------------------------------------------------------------------

	    layer = new OpenLayers.Layer.MapServer("myMap", "url", {map:
'file.map'});
		
        map.addLayers([layer]);

        map.events.register('click', map, function(evt) {
            document.getElementById("infoResult").innerHTML = "Recherche en
cours..."
            var url = layer.getFullRequestString({
                REQUEST: "GetFeatureInfo",
               	EXCEPTIONS: "application/vnd.ogc.se_xml",
                STYLES: "",
                BBOX: map.getExtent().toBBOX(),
                X: evt.xy.x,
                Y: evt.xy.y,
                QUERY_LAYERS: "myLayer",
                FEATURE_COUNT: 1,
                WIDTH: map.size.w,
                HEIGHT: map.size.h,
                INFO_FORMAT: 'text/html'
            });
            //alert(url);
        	OpenLayers.loadURL(url, '', this, setInfoResult);
         	Event.stop(evt);
     	});

	// ....
		
	function setInfoResult(response) { 
        //alert(response);
		document.getElementById("infoResult").innerHTML = response.responseText;
     }

-------------------------------------------------------------------------------------------

When I click anywhere on the map, the "infoResult" shows "?PNG  " (the
display is a square next to "PNG" characters).
So I'm questionning myself on what I'm doing wrong.
About the QUERY_LAYERS parameter, with value "myLayer", do I have to put the
name of the layer loaded with OpenLayers ("myMap") or the name of a layer
inside of my mapfile ("myLayer") ?
Is this code can work with postgis layers ?
Do I have to work in another way ?

I find that OpenLayers online help
(http://dev.openlayers.org/releases/OpenLayers-2.9/doc/apidocs/index/General.html)
isn't really "user friendly" and hard to understand.
I spent lot of days to be able to simply display a map.

Any help will be much apprecied.

Thanks in advance.

Regards,

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