[ms4w-users] problems querying shape via mapscript

[Giovanni A.]

Hello,
I'm having a problem with querying a shapefile layer, using "queryByPoint", basing my prototype on gmap demo application. Everything works fine, it shows me all the layer present in the map, the coordinate points "$nClickGeoX,$nClickGeoY" are correctly transformed from screen coords to projected coords, but "$numResults " is always equal to 0... I'm going mad! What's wrong with my script? Do I have to set some particular tags in teh mapfile to allow querying? (In the map demo there isn't any particular tag).
Help, it's urgent...


    $oClickGeo = ms_newPointObj();
    $oClickGeo->setXY($nClickGeoX, $nClickGeoY);
    @$gpoMap->queryByPoint($oClickGeo, MS_SINGLE, -1);
    for($iLayer=0; $iLayer < $gpoMap->numlayers; $iLayer++)
    {
    $oLayer = $gpoMap->GetLayer($iLayer);
    $oLayer->open();
    $numResults = $oLayer->getNumResults();
    echo $numResults;
    $oLayer->close();
   }
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