[mapguide-users] Null reference query problem:

[Steve Dang]

Try the following:

$map = new MgMap($site);
$map->Open($mgMapName);

See http://trac.osgeo.org/mapguide/wiki/MapGuideRfc9 for more information.

Steve.

-----Original Message-----
From: mapguide-users-bounces at lists.osgeo.org [mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Dragan Podvezanec
Sent: Wednesday, July 30, 2008 4:30 AM
To: mapguide-users at lists.osgeo.org
Subject: [mapguide-users] Null reference query problem:


Hi all.

I want to execute custom query on one layer using PHP. $mgSessionId and
$parcel_id are passed from another page and they are ok (I checked with
echo). Here's the code:

<?php

                include 'constants.php';
                $mgSessionId = $_GET['SESSION'];
                $parcel_id = $_GET['parcel_id'];

    try
    {

        MgInitializeWebTier("$../../webconfig.ini");

        $userInfo = new MgUserInformation($mgSessionId);
        $siteConnection = new MgSiteConnection();
        $siteConnection->Open($userInfo);

        $resourceService =
$siteConnection->CreateService(MgServiceType::ResourceService);
        $featureService =
$siteConnection->CreateService(MgServiceType::FeatureService);
        $map = new MgMap();
        $mgMapName = 'map1';
        $map->Open($resourceService, $mgMapName);


                $queryOptions = new MgFeatureQueryOptions();
                $queryOptions->SetFilter("parcel_id = $parcel_id");

                $layer2 = $map->GetLayers()->GetItem('parcels');
                $featureReader = $layer2->SelectFeatures($queryOptions);


    }

?>

But this returns the following:

Null reference.Null reference. Exception occurred in method MgMap.GetService
at line 93 in file
d:\buildforgeprojects\mapguide_open_source_v2.0\build_23.8\mgdev\common\mapguidecommon\MapLayer/Map.cpp

What is wrong here?
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