createGeometryFromWkbVariant giving Null Pointer exception

ImranRajjad — Thu, 21 Jan 2016 06:54:19 GMT

I have been trying to use the IGeometryFactoryProxy.createGeometryFromWkbVariant to convert OGC WKB into an IGeometry object. I have had no luck with this at all. Was unable to find any Java example on this. The Wkb bytes are valid since I am able to convert them into geometry using another third party API esri-geometry-core. The doucumentation suggests that I should pass in the byte[], a single element array of IGeometry (I have no idea if this array should be empty or populated with empty geometry but I assigned an empty geometry anyways), lastly a single element int[1] which holds the size of WKB at [0]. as suggested by the documentation. I get Null Pointer exception with the following stack

java.lang.NullPointerException

at com.esri.arcgis.interop.Dispatch.vtblInvoke(Unknown Source)

at com.esri.arcgis.geometry.IGeometryFactoryProxy.createGeometryFromWkbV

ariant(Unknown Source)

my java code

IGeometry[] geomArr = new IGeometry[1];

geomArr[0]=new com.esri.arcgis.geometry.Polygon(); //populate with an empty polygon

byte[] wkb = ... //populate bytes array

int[] intArr = new int[1];

intArr[0]=wkb.length; //size of bytes

IGeometryFactory3Proxy geometryFactory = new IGeometryFactory3Proxy();

geometryFactory.createGeometryFromWkb(intArr, wkb, geomArr); //tried this

geometryFactory.createGeometryFromWkbVariant(wkb, geomArr, intArr); //also tried this

geomArr[0].toString();

any idea what am I doing wrong.

Re: createGeometryFromWkbVariant giving Null Pointer exception

ImranRajjad — Thu, 21 Jan 2016 08:06:19 GMT

Ok I have solved it, thanks and no thanks to terrible arcobjects java code samples folks

instead of using IGeometryFactory3Proxy use GeometryEnvironment and use createGeometryFromWkbVariant(wkb, geomArr, intArr)

hope this helps somebody

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createGeometryFromWkbVariant giving Null Pointer exception

Re: createGeometryFromWkbVariant giving Null Pointer exception