[mapserver-users] Fwd: queryByPoint - Street Layer ?

[Hussain Hashmi]

---------- Forwarded message ----------
From: mir m. Hashmi <mhashmi at sp.com.sa>
Date: Mon, Jul 6, 2009 at 4:11 PM
Subject: queryByPoint - Street Layer ?
To: "mapserver-users at lists.osgeo.org" <mapserver-users at lists.osgeo.org>


 Hello

Can anyone please guide me on this issue.
My Objective is to get attribute values for any selected street (Line).
My client application is based on KaMap.
I have a similar solution for Polygons which works perfectly.


I am trying to query a street layer which gives me the following error.

Warning: [MapServer Error]: msQueryByPoint(): No matching record(s) found in
C:\... on line 84
Warning: [MapServer Error]: msShapefileOpen():
(/ms4w/maps/./city/./city/streets) in c:\... on line 84


MAPFILE
**********************
  LAYER
    NAME 'streets_Query'
    GROUP 'streets_Query'
    DATA './city/streets'
    TYPE line
    MAXSCALE 3001
    STATUS ON

    TOLERANCE 5
    TEMPLATE './_templates/Streets_Identify.html'
    METADATA
      "queryable" "true"
       searchfield "ANAME"
       fields "ZIP_CODE"
    END
  END #end layer



PHP MAPSCRIPT
**********************
//------- Get Input Parameters.
if (isset($_REQUEST['map']))    {$szMap = $_REQUEST['map'];} else {echo "map
not defined"; die;}
if (isset($_REQUEST['coords'])) {$coords =
explode(',',$_REQUEST['coords']);} else {echo "coordinate not defined";
die;}


//------- Load Mapscript Module.
$szPHPMapScriptModule = 'php_mapscript.'.PHP_SHLIB_SUFFIX;
if (!extension_loaded('MapScript')) {
 dl($szPHPMapScriptModule);
}

//------- Load Current Map file.
$szMapFile=str_replace('<<Map>>',$szMap,'/ms4w/maps/<<Map>>.map');
$oMap = ms_newMapObj($szMapFile);


//------- SETTING MAP EXTENT to query extent..
$mapExtent = $oMap->extent;
$oMap->setExtent($coords[0],$coords[1],
$coords[0]+0.000001,$coords[1]+0.000001);

//------- SETTING QUERY POINT
$point = ms_newPointObj();
$point->setXY($coords[0], $coords[1]);

//------- Initialize map query.
$oMap->preparequery();

//------- LOOP ON LAYERS and get identify results.
$tot = $oMap->numlayers;
for ($i = 0; $i < $tot; $i++) {
   //------- get map layer.
   $oLayer = $oMap->getLayer($i);

   //------- Verify Layer type
   if ($oLayer->name != 'streets_Query') continue;

   //------- Validate if query succeeds.
   $check_query = $oLayer->queryByPoint($point, MS_SINGLE, 0);
   if ($check_query != MS_SUCCESS) {continue;}

   //------- Open layer for data input.
    $oLayer->open();

   //------- Get the record values corresponding to a result tileindex.
   $oResultCache = $oLayer->getResult(0);
   $oShape = $oLayer->getShape($oResultCache->tileindex,
$oResultCache->shapeindex);
   $aValues = $oShape->values;

   //------- Get the field value.
   echo $aValues['ZIP_CODE'];  echo ";";

   //------- FREE SHAPE
   $oShape->free();
   $oLayer->close();
   break;
} // for i


Best regards,
Mir Hashmi



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