topic Re: Not able to perform Query on FeatureLayer and GeoCode using ESRI's geocode service. in ArcGIS Runtime SDK for iOS Questions

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

RavindraSingh — Sun, 02 Sep 2018 10:30:03 GMT

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.

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

NimeshJarecha — Tue, 04 Sep 2018 16:01:54 GMT

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