IGeometryBridge.GetPoints throws NotImplementedException. Am I doing something wrong?

Question

I am working on some .NET code that processes lots of polygon geometries at the vertex level. In order to reduce COM interop overhead, I want to call IGeometryBridge2.GetPoints once instead of calling IPointCollection.Point repeatedly:

// using ESRI.ArcGIS.Geometry;
static IPoint[] GetVertices(this IPolygon singlepartPolygon)
{
    var pointCollection = (IPointCollection4)singlepartPolygon;
    var points = new IPoint[pointCollection.PointCount];
    var geometryBridge = (IGeometryBridge2)new GeometryEnvironment();
    geometryBridge.GetPoints(pointCollection, 0, ref points);
    return points;
}

geometryBridge.GetPoints(…) throws a NotImplementedException.

(I have tried initialising the points array with empty Point instances before calling GetPoints, but this didn't make any difference. I tried geometryBridge.QueryPoints(…), too, and this failed with a different exception.)

Am I doing something wrong, or is this more likely to be a bug?

The doc implies it only works for multipoint, which kinda defeats the purpose of interface based programming. Maybe a leaky abstraction? — Kirk Kuykendall, Feb 03 '13 at 04:30
I have found the best way to reduce COM interop overhead during vertex-heavy operations is to use the WKS structure related methods, like QueryWKSPoints, SetWKSPoints, InsertWKSPoints etc. Depends on your scenario, but the performance gain should be greater. — Petr Krebs, Feb 03 '13 at 12:27
Not sure if it matters but try GeometryEnvironmentClass() instead of GeometryEnvironment(). That is the .NET runtime callable wrapper (RCW) for the GeometryEnvironment COM type: http://help.arcgis.com/en/sdk/10.0/arcobjects_net/conceptualhelp/index.html#//000100000151000000 — blah238, Feb 03 '13 at 14:06
new GeometryEnvironment() is exactly the same as new GeometryEnvironmentClass(). GeometryEnvironment (which is an interface) is decorated with the CoClass attribute: CoClass(typeof(GeometryEnvironmentClass)), so that the compiler knows which class you are instantating. This is how the .NET COM type library importer converts types (for better compatibility with legacy languages and environments). — Petr Krebs, Feb 04 '13 at 12:07

blah238 · Accepted Answer · 2013-02-03T16:28:26.570

1

IGeometryBridge.QueryPoints() works for me at ArcGIS 10.1 SP1:

static IPoint[] GetVertices2(this IPolygon singlepartPolygon)
{
    var pointCollection = (IPointCollection4)singlepartPolygon;
    var points = new IPoint[pointCollection.PointCount];
    for (int i = 0; i < points.Length; i++)
    {
        points[i] = new PointClass();
    }
    var geometryBridge = (IGeometryBridge)new GeometryEnvironmentClass();
    geometryBridge.QueryPoints(pointCollection, 0, ref points);
    return points;
}

edited Feb 03 '13 at 16:28

answered Feb 03 '13 at 16:12

blah238

35,793
7
94
195

This could be due to SP1. Does it also work without the for loop, i.e. if you don't initialise the array? – stakx Feb 03 '13 at 16:31
It doesn't throw an exception, but the array elements are all null. – blah238 Feb 03 '13 at 16:33
I used LINQPad to test this, BTW, here is my query: https://gist.github.com/4702432. Tested against both .NET 3.5 and .NET 4.0. – blah238 Feb 03 '13 at 16:38
This answer talks about QueryPoints. Does this mean that GetPoints also didn't work for you? (Or did your Gist code which uses GetPoints work?) – stakx Feb 03 '13 at 16:38
1

Correct, as Kirk mentioned it is not implemented for anything but Multipoint geometries. – blah238 Feb 03 '13 at 16:39
1

The Gist includes both methods (QueryPoints and GetPoints) so you can test them. – blah238 Feb 03 '13 at 16:43

IGeometryBridge.GetPoints throws NotImplementedException. Am I doing something wrong?

1 Answers1