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Accessing Map service info?

AndrewEgleton

Hi,

I'm trying to read the visible status of individual layers in a map service at start up so I can set if they are visible or not, but I am having no luck accessing the Map Service Info, here is my code:

 // Get indexes of visible layers
 AGSMapServiceInfo *dynaServiceInfo = self.dynamicLayer.mapServiceInfo;
 AGSMapServiceLayerInfo *dynaLayerInfo;
 NSMutableArray *visibleLayers = [NSMutableArray arrayWithCapacity:[dynaServiceInfo.layerInfos count]];
 for (int i = 0; i < [dynaServiceInfo.layerInfos count]; i++) {
  dynaLayerInfo = [dynaServiceInfo.layerInfos objectAtIndex:i];
  if (dynaLayerInfo.visible == YES) {
   [visibleLayers addObject:[[NSNumber alloc] initWithInt:i]];
  }
 }

My AGSMapServiceInfo object is always empty, but I'm not sure what I'm doing wrong. I've also tried directly accessing the layerInfos, and creating an array from them with no success either.
Any help appreciated.

Andy.

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Accepted answers

All comments

MarcoBrugna

Use this way:

AGSMapServiceInfo *serviceInfo = [[AGSMapServiceInfo alloc] initWithURLSynchronous:[NSURL URLWithString:aLayer.url]]; 
AGSDynamicMapServiceLayer *dynLayer = [[AGSDynamicMapServiceLayer alloc] initWithMapServiceInfo:serviceInfo];

so when you access to dynLayer.mapServiceInfo it will be not empty.

AndrewEgleton

Thanks, that work perfectly!

I'm slowly getting my head around the iPhone SDK/Objective C, but its very different to C#!

KOLDODUARTE

Use this way:

AGSMapServiceInfo *serviceInfo = [[AGSMapServiceInfo alloc] initWithURLSynchronous:[NSURL URLWithString:aLayer.url]]; 
AGSDynamicMapServiceLayer *dynLayer = [[AGSDynamicMapServiceLayer alloc] initWithMapServiceInfo:serviceInfo];

so when you access to dynLayer.mapServiceInfo it will be not empty.

In the new API 1.0 this is not works me, previusly with the Beta versions It is works perfectly, but now no, someone knows?

Thanks & Best Regards,
Koldo.

NimeshJarecha

The AGSMapServiceInfo::initWithURLSynchronous has been renamed to AGSMapServiceInfo::initWithURL:error:. Please refer Migration doc for detail of all changes.

You can refer ArcGIS Dynamic Map Service Layer doc as well.

Regards,
Nimesh

KOLDODUARTE

The AGSMapServiceInfo::initWithURLSynchronous has been renamed to AGSMapServiceInfo::initWithURL:error:. Please refer Migration doc for detail of all changes.

You can refer ArcGIS Dynamic Map Service Layer doc as well.

Regards,
Nimesh

Hi Nimesh,

I read all changes and I applied it, now I have this code, for example:

NSURL *url = [NSURL URLWithString: @"http://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"];

AGSMapServiceInfo *serviceInfo = [AGSMapServiceInfo mapServiceInfoWithURL:url error:nil];

AGSDynamicMapServiceLayer *dynLayerInfo = [AGSDynamicMapServiceLayer dynamicMapServiceLayerWithMapServiceInfo:serviceInfo]; 
 
NSString *info = dynLayerInfo.mapServiceInfo.serviceDescription;

Just it breaks in first line and I don´t know why!

Attach the error!

NimeshJarecha

You should pass the 'error' like below. It'll be populated if there is an error in creating instance of AGSMapServiceInfo.

NSError *error = nil;
AGSMapServiceInfo *serviceInfo = [AGSMapServiceInfo mapServiceInfoWithURL:url error:&error];

Hope this helps!

Regards,
Nimesh

KOLDODUARTE

You should pass the 'error' like below. It'll be populated if there is an error in creating instance of AGSMapServiceInfo.

NSError *error = nil;
AGSMapServiceInfo *serviceInfo = [AGSMapServiceInfo mapServiceInfoWithURL:url error:&error];

Hope this helps!

Regards,
Nimesh

Ok, now it is good, thank you!.. one more.

KOLDODUARTE

I were mistaken, sorry!

Please, someone tries this code:

NSError *error = nil; 
 
 NSURL *url = [NSURL URLWithString: @"http://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer"];
 
 AGSMapServiceInfo *serviceInfo = [AGSMapServiceInfo mapServiceInfoWithURL:url error:&error];
 
 AGSDynamicMapServiceLayer *dynLayerInfo = [AGSDynamicMapServiceLayer dynamicMapServiceLayerWithMapServiceInfo:serviceInfo]; 
 
 NSString *info = dynLayerInfo.mapServiceInfo.serviceDescription;
  
 UIAlertView *vModal = [[UIAlertView alloc]
         initWithTitle:@Map Service error
         message:info
         delegate:self
         cancelButtonTitle:@Done
         otherButtonTitles:nil, nil];
 [vModal show];
 [vModal release];

The error is:

NimeshJarecha

You are trying to access the layer information before it finished initialization. When the layer is ready, its loaded property will be enabled. You can then safely access its properties.

if(dynLayerInfo.loaded){
NSLog(@Initial Envelope : %@", dynLayerInfo.initialEnvelope);
}

Regards,
Nimesh

KOLDODUARTE

Thanks Nimesh,

Now Its OK!

BR,
Koldo

DarrenMackiewicz

OK. This post incorporates many different versions of the API, etc.
I just tried to follow this and my head is spinning.

Nimesh, can you please piece this together and show us how in the most recent API I (we) can get access to the current layers that are visible and drawn on the map in a map service. (not the default visible property on the layer). I would be VERY appreciative of this.
Thanks!

NimeshJarecha

Here is how you should get the information of current visible dynamic map service layer,

- Get all layers in map from AGSMapView::mapLayers.
- Loop through all the layers and check the type of AGSLayer as AGSDynamicMapServiceLayer.
- Get the current visible layers indexes from AGSDynamicMapServiceLayer::visibleLayers.
- if you want more information of that layer then pass index in the AGSDynamicMapServiceLayer:: mapServiceInfo::layerInfos. You'll have AGSMapServiceLayerInfo.

Hope this helps!

Regards,
Nimesh

DarrenMackiewicz

Thanks for the clarification! I'll give it a try and report back.

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