Not able to perform Query on FeatureLayer and GeoCode using ESRI's geocode service.

RavindraSingh · ‎09-02-2018

I am using

ArcGIS-Runtime-SDK-iOS', '100.2.1'
XCode 9.4.1
iOS 11.4 Simulator

I am trying to perform GeoCode

using - https://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer

using below Code - (code is copied from ESRI-GitHub Sample Codes )

func testGeoCode(){
// Try to query MapService
let locatorURL = "http://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer"
let locatorTask:AGSLocatorTask = AGSLocatorTask(url: URL(string: locatorURL)!)
let geocodeParameters:AGSGeocodeParameters = AGSGeocodeParameters()
geocodeParameters.resultAttributeNames.append(contentsOf: ["*"])
geocodeParameters.minScore = 75

//perform geocode with text
locatorTask.geocode(withSearchText: "California", parameters: geocodeParameters, completion: { (results:[AGSGeocodeResult]?, error:Error?) -> Void in
if let error = error {
print("testGeoCode Error::: \(error)")
}
else {
if let results = results , results.count > 0 {
print("GeoCode Result found::: \(results.count)")
//create a graphic for the first result and add to the graphics overlay
_ = AGSGraphic(geometry: results[0].displayLocation!, symbol: nil, attributes: results[0].attributes as [String : AnyObject]?)
// let graphic = self?.graphicForPoint(results[0].displayLocation!, attributes: results[0].attributes as [String : AnyObject]?)
// self?.graphicsOverlay.graphics.add(graphic!)
}
else {
//provide feedback in case of failure
print("No GeoCode Result found.......)")
}
}
})
}

but this above code never gives result. and ends up with below error:

Some Times This::

testGeoCode Error::: Error Domain=NSCocoaErrorDomain Code=3072 "User canceled error" UserInfo={NSLocalizedDescription=User canceled error}
2018-09-02 13:12:36.204621+0300 ERS[8764:217712] Task <9EC69EBF-C7BE-45AF-8564-F6B607856D45>.<185> finished with error - code: -999
2018-09-02 13:12:36.204795+0300 ERS[8764:218992] Task <A6812BF2-37CC-4470-B0D0-5C53E5BD7FFD>.<184> HTTP load failed (error code: -999 [1:89])
2018-09-02 13:12:36.205268+0300 ERS[8764:217712] Task <A6812BF2-37CC-4470-B0D0-5C53E5BD7FFD>.<184> finished with error - code: -999

Some Times::

2018-09-02 13:20:07.760707+0300 ERS[9134:225343] Task <3C0CE309-4E55-4A3F-B62F-AD54EB132FA6>.<203> HTTP load failed (error code: -999 [1:89])

I am also performing Query:: using below Code:: - (code is copied from ESRI-GitHub Sample Codes- for Query )

func testQueryOnLayer(){
let featureTable = AGSServiceFeatureTable(url: URL(string: "http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2")!)
let featureLayer = AGSFeatureLayer(featureTable: featureTable)
featureLayer.selectionWidth = 5

let searchText = "California"

let queryParams = AGSQueryParameters()
queryParams.whereClause = "upper(STATE_NAME) LIKE '%\(searchText.uppercased())%'"

featureTable.queryFeatures(with: queryParams, completion: { (result:AGSFeatureQueryResult?, error:Error?) -> Void in
if let error = error {
print("testQueryOnLayer Error::: \(error)")
}
else if let features = result?.featureEnumerator().allObjects {
if features.count > 0 {
print("GeoCode Result found::: \(features.count)")
//mapView.setViewpointGeometry(features[0].geometry!, padding: 80, completion: nil)
}
else {
print("No query Result found.......)")
}
}
})
}

This above code executes, neither gives error nor gives result.

NOTE:: I have already made changes into my info.plist file. to avoid ATS as below::

<key>NSAppTransportSecurity</key>
<dict>
<key>NSExceptionDomains</key>
<dict>
<key>arcgis.com</key>
<dict>
<key>NSIncludesSubdomains</key>
<true/>
<key>NSThirdPartyExceptionAllowsInsecureHTTPLoads</key>
<true/>
</dict>
<key>arcgisonline.com</key>
<dict>
<key>NSIncludesSubdomains</key>
<true/>
<key>NSThirdPartyExceptionAllowsInsecureHTTPLoads</key>
<true/>
</dict>
<key>esri.com</key>
<dict>
<key>NSIncludesSubdomains</key>
<true/>
<key>NSThirdPartyExceptionAllowsInsecureHTTPLoads</key>
<true/>
</dict>
</dict>
</dict>

Any Leads please.

NimeshJarecha · ‎09-04-2018

You are not holding on to the objects on which you are sending requests. Hence, things are not working as expected. Please look at the modified code below. The `locatorTask` and `featureTable` are declared as class level variables and now queries are successfully returns results.

var locatorTask: AGSLocatorTask?
func testGeoCode(){
// Try to query MapService
let locatorURL = "http://geocode.arcgis.com/arcgis/rest/services/World/GeocodeServer"
locatorTask = AGSLocatorTask(url: URL(string: locatorURL)!)
let geocodeParameters:AGSGeocodeParameters = AGSGeocodeParameters()
geocodeParameters.resultAttributeNames.append(contentsOf: ["*"])
geocodeParameters.minScore = 75

//perform geocode with text
locatorTask?.geocode(withSearchText: "California", parameters: geocodeParameters, completion: { (results:[AGSGeocodeResult]?, error:Error?) -> Void in
if let error = error {
print("testGeoCode Error::: \(error)")
}
else {
if let results = results , results.count > 0 {
print("GeoCode Result found::: \(results.count)")
//create a graphic for the first result and add to the graphics overlay
_ = AGSGraphic(geometry: results[0].displayLocation!, symbol: nil, attributes: results[0].attributes as [String : AnyObject]?)
// let graphic = self?.graphicForPoint(results[0].displayLocation!, attributes: results[0].attributes as [String : AnyObject]?)
// self?.graphicsOverlay.graphics.add(graphic!)
}
else {
//provide feedback in case of failure
print("No GeoCode Result found.......)")
}
}
})
}

var featureTable: AGSServiceFeatureTable?
func testQueryOnLayer(){
featureTable = AGSServiceFeatureTable(url: URL(string: "http://sampleserver6.arcgisonline.com/arcgis/rest/services/USA/MapServer/2")!)
let featureLayer = AGSFeatureLayer(featureTable: featureTable!)
featureLayer.selectionWidth = 5

let searchText = "California"

let queryParams = AGSQueryParameters()
queryParams.whereClause = "upper(STATE_NAME) LIKE '%\(searchText.uppercased())%'"

featureTable?.queryFeatures(with: queryParams, completion: { (result:AGSFeatureQueryResult?, error:Error?) -> Void in
if let error = error {
print("testQueryOnLayer Error::: \(error)")
}
else if let features = result?.featureEnumerator().allObjects {
if features.count > 0 {
print("GeoCode Result found::: \(features.count)")
//mapView.setViewpointGeometry(features[0].geometry!, padding: 80, completion: nil)
}
else {
print("No query Result found.......)")
}
}
})
}

Hope this helps!

Regards,

Nimesh