AGSIdentifyParameters not receiving according to order on Server, always get in Ascending Order.

[PritiBose]

hello,

This is very strange , as from my Server site i have below Parameters for one of the Layers...

Fields:

FID (Type: esriFieldTypeOID, Alias: FID)

Shape (Type: esriFieldTypeGeometry, Alias: Shape)

APN (Type: esriFieldTypeString, Alias: APN, Length: 11 )

PREVIOUSAP (Type: esriFieldTypeString, Alias: PREVIOUSAP, Length: 200 )

AREA (Type: esriFieldTypeDouble, Alias: AREA)

ACRES (Type: esriFieldTypeDouble, Alias: ACRES)

ZONING (Type: esriFieldTypeString, Alias: ZONING, Length: 25 )

VAC (Type: esriFieldTypeString, Alias: VAC, Length: 1 )

EVAC (Type: esriFieldTypeString, Alias: EVAC, Length: 5 )

FIRE (Type: esriFieldTypeString, Alias: FIRE, Length: 5 )

ZMASK (Type: esriFieldTypeString, Alias: ZMASK, Length: 16 )

PERIMETER (Type: esriFieldTypeDouble, Alias: PERIMETER)

PC_LANDUSE (Type: esriFieldTypeString, Alias: PC_LANDUSE, Length: 2 )

TRACT (Type: esriFieldTypeString, Alias: TRACT, Length: 16 )

BOOK (Type: esriFieldTypeString, Alias: BOOK, Length: 3 )

TIF (Type: esriFieldTypeString, Alias: TIF, Length: 40 )

LOTNO (Type: esriFieldTypeString, Alias: LOTNO, Length: 5 )

TEMP (Type: esriFieldTypeString, Alias: TEMP, Length: 6 )

CENSUS (Type: esriFieldTypeString, Alias: CENSUS, Length: 9 )

GP (Type: esriFieldTypeString, Alias: GP, Length: 25 )

Type ID Field: N/A

i can access all the parameters or GIS Attributes from my iPAD app with below code...

            self.m_identifyParams.layerIds=arrLayerIDs; // Layer ID

            self.m_identifyParams.tolerance = 3;

            self.m_identifyParams.geometry =  env;

            self.m_identifyParams.size = self.m_mapView.bounds.size;

            self.m_identifyParams.mapEnvelope = self.m_mapView.visibleArea.envelope;

            self.m_identifyParams.returnGeometry = YES;

            self.m_identifyParams.layerOption = AGSIdentifyParametersLayerOptionAll;

            self.m_identifyParams.spatialReference = self.m_mapView.spatialReference;

            [self.m_identifyTask executeWithParameters:self.m_identifyParams];

- (void)identifyTask:(AGSIdentifyTask *)m_identifyTask operation:(NSOperation *)op didExecuteWithIdentifyResults:(NSArray *)results

but what i am getting IdentifyResults is as in below Order Ascending Order:

    ACRES = "15.59";

    APN = "038-240-022";

    AREA = "678953.526";

    BOOK = 038;

    CENSUS = "";

    EVAC = "";

    FID = 5221;

    FIRE = "";

    GP = "ULDR - 2 DU/Ac CD/OSP";

    LOTNO = "";

    "PC_LANDUSE" = 00;

    PERIMETER = "4375.32";

    PREVIOUSAP = "";

    Shape = Polygon;

    TEMP = "";

    TIF = "http://gis/data/mapbks/bk038/03824.00";

    TRACT = "056-037";

    VAC = P;

    ZMASK = "Placer County";

    ZONING = "Placer County";

but i wish to get in same order as above from server Fields: , starting from FID, Shape ETC...

[GagandeepSingh]

Is that the list of attributes on a feature/graphic returned by identifyTask? If yes, then since `allAttributes` property is an `NSDictionary`, you cannot preserve the order. Otherwise, can you elaborate on how you are accessing these properties?

[PritiBose]

yes, it is identifyTask. i access 'allAttributes' which is NSDictionary, from - (void)identifyTask:(AGSIdentifyTask *)m_identifyTask operation:(NSOperation *)op didExecuteWithIdentifyResults:(NSArray *)results

callback return on success method.

so in iPad(IOS SDK of ESRI) it is not possible. and i will always get in Ascending order....... and not according on attributes on a feature/graphic Layer.

it was requirement to display attributes as it is..from server...   if possible any workaround...

[GagandeepSingh]

One workaround I can think of is creating an array of ordered keys : ["FID", "Shape", "APN", .... ]. Then looping through the array and getting the value corresponding to each key.

[PritiBose]

sorry that won't be possible as different Layers will have diff, Attributes...also no. of attributes differs.... also diff clients have different MAPs....so i guess i have to go ahead with Order what i get...

[PritiBose]

Hello,

there is no way even to access Layers Fields name...?

there should be method to access simple Layers Fields name.... and those will give me in proper order ....

[GagandeepSingh]

AGSFeatureLayer has a property `fields` you can use to get the fields in the right order. Simply create a feature layer using the URL and inside layerDidLoad, you should have the fields in the right order.

Let me know if this helps.

Gagan

[PritiBose]

sorry, i tried Esri sample example itself.... GenerateRendererSample .... with all possible ways..but fields getting 0 key element...it does show 53 elements but all are 0

initWithString:FEATURE_SERVICE_URL = http://sampleserver6.arcgisonline.com/arcgis/rest/services/Census/MapServer/2

    //initialize the feature layer and assign the delegate

    self.featureLayer = [[AGSFeatureLayer alloc] initWithURL:[[NSURL alloc] initWithString:FEATURE_SERVICE_URL] mode:AGSFeatureLayerModeSnapshot];

    self.featureLayer.delegate = self;

    //using definition expression to get counties(features) for just California

With below code commented or without commented

    self.featureLayer.definitionExpression = @"state_name = 'California'";

    self.featureLayer.outFields = @[@"*"];

    [self.mapView addMapLayer:self.featureLayer];

-(void)layerDidLoad:(AGSLayer *)layer {

    //once the feature layer gets loaded

    //assign the layer's fields to the legend view controller

    self.legendViewController.classificationFields = self.featureLayer.fields;

}

layer.field ==> 0 key/value pair for all 53 fields

self.featureLayer.fields==> 0 key/value pair for all 53 fields

[PritiBose]

[GagandeepSingh · Accepted solution]

AGSField is an object and not a dictionary. So if you access either of the 53 objects, cast it to AGSField and print the `name` property you should see the right values.

Refer to AGSField object.

This is what I got:

(lldb) po ((AGSField*)((AGSFeatureLayer*)layer).fields[0]).name

OBJECTID