[mapguide-users] Getting layer properties

[Jim O'Leary]

I found a way. It's a bit roundabout. I was hoping for something simpler...

$map = new MgMap();
$map->Open($resourceService, $mapName);
$layerCollection = $map->GetLayers();
$count = $layerCollection->GetCount();
$queryOptions = new MgFeatureQueryOptions();
for($i=0;$i<$count;$i++)
{
      $nextLayer = $layerCollection->GetItem($i);
      $layerName = $nextLayer->GetName();
      $resourceIdentifier = new
MgResourceIdentifier("Library://Cowichan/Data/$layerName.FeatureSource");
      $featureReader =
$featureService->SelectFeatures($resourceIdentifier,$layerName,$queryOptions);
      /* $arLayerProperties is passed by reference, so we don't have to
return it. We don't
          have to declare it ahead of time, either. Thanks, PHP.
     */
      getLayerProperties($featureReader,$layerName,$arLayerProperties);
}
// Display our data
print "<pre>";
print_r($arLayerProperties);
print "</pre>";

function getLayerProperties($featureReader,$layerName,&$arLayerProperties)
{
    $featureReader->ReadNext();
    $propertyCount = $featureReader->GetPropertyCount();
    for($i=0; $i<$propertyCount; $i++) 
    {
        $propertyName = $featureReader->GetPropertyName($i);
        $boolVal = $featureReader->IsNull($propertyName);
        if ($boolVal) 
        {
            continue;
        }// end if
        $arLayerProperties[$layerName][] = $propertyName;
    }// end for

}//end of getLayerProperties


Jim O wrote:
> 
> I can open a map and then iterate through the layers like this:
> 
>         $layerCollection = $map->GetLayers();
>         $count = $layerCollection->GetCount();
>         for($i=0;$i<$count;$i++)
>         {
>            $nextLayer = $layerCollection->GetItem($i);
>         }
>   
> I'd like next to get the properties for each layer, something like:
>      
>          $propertiesCollection = $nextLayer->GetProperties();
> 
> But I don't see any method for that. Is there a way to do it?
> 
> Thanks.       
> 

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