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Read geometry from JSON object

XintaoLiu

In Flex 3, I convert a featureset (including several simple polygons) to JSON object: var geomJSON:Object = myFeatureSet.toJSON();

Then I pass the geomJSON as a parameter to a web service (developed using VS2010 C# language). Now the problem is: how to read the polygons inside the C# web service? What kinds of ESRI classes should I use?

Many thanks in advance!

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Accepted answers

TomSchuller

Hy,
you should ask this question in the ArcObjects forum.

But here my solution in Java:

import com.esri.arcgis.geometry.Polygon; import com.esri.arcgis.system.JSONReader; import com.esri.arcgis.geodatabase.JSONDeserializerGdb;   JSONReader reader = new JSONReader(); reader.readFromString(jsonTxt); JSONDeserializerGdb ds = new JSONDeserializerGdb(); ds.initDeserializer(reader, null); Polygon polygon = (Polygon) ds.readGeometry(esriGeometryType.esriGeometryPolygon);

This should be similar in C++.

Tom

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CarstenSchumann

I was trying this in C#. However when I cast that to IPolygon (which should be the .NET-equivalent to the Polygon-interface in your Java-solution), I get an InvalidCastException, as seen here https://community.esri.com/thread/215252-jsonconvertergeometryclass-creates-invalid-geometries

XintaoLiu

Hy,
you should ask this question in the ArcObjects forum.

But here my solution in Java:

import com.esri.arcgis.geometry.Polygon;
import com.esri.arcgis.system.JSONReader;
import com.esri.arcgis.geodatabase.JSONDeserializerGdb;


JSONReader reader = new JSONReader();
reader.readFromString(jsonTxt);
JSONDeserializerGdb ds = new JSONDeserializerGdb();
ds.initDeserializer(reader, null);
Polygon polygon = (Polygon) ds.readGeometry(esriGeometryType.esriGeometryPolygon);

This should be similar in C++.

Tom

Thanks a lot! It is very helpful! I will try in my C# project and then get back. Thank you again!

TomSchuller

Hy,
you should ask this question in the ArcObjects forum.

But here my solution in Java:

import com.esri.arcgis.geometry.Polygon; import com.esri.arcgis.system.JSONReader; import com.esri.arcgis.geodatabase.JSONDeserializerGdb;   JSONReader reader = new JSONReader(); reader.readFromString(jsonTxt); JSONDeserializerGdb ds = new JSONDeserializerGdb(); ds.initDeserializer(reader, null); Polygon polygon = (Polygon) ds.readGeometry(esriGeometryType.esriGeometryPolygon);

This should be similar in C++.

Tom

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