Latest Contributions by CarstenSchumann

Hey there, when I query a featureClass with featureClass.Search(filter, true) I get the exception mentioned above. Unfortunately I cannot reproduce this error in any way, it happens only on production-machine of a customer. But hence the data being queried is quite huge (some millions of points) searching for the one feature that fails nearly impossible or at least quite annoying. My customer also guaranteed that there are no writing processes on the featureClass (SDE-version), so I wonder where this exception may come from. To save memory I release every row after having handled it (calling Marshal.ReleaseComObject within a loop as long as references exist): List<string> UUIDs = new List<string>(); IQueryFilter filter = new QueryFilter { SubFields = "UUID"};  // this should save us so much time cursor = ((ITable)dataset).Search(filter, true); // we take a recycling-cursor because we handle only immutable strings (UUIDs) while ((row = cursor.NextRow()) != null) {      UUIDs.Add((string)row.get_Value(1));      ReleaseComObject(row);                      // release the underlying COM-object as often as references exist } After many thousands of features handled we get the exception. Unfortunately I could not even print any ID of the faulty feature to handle it manually because I cannot access it. I do not have any clue how I may get around the issue or at least how to avoid it. Kind regards ... View more

Hey around, I´m trying to build a query that provides access to features within a FC that intersect a given geometry AND that apply to an attribute-based query from another table by a join. For the last one I may use the IQueryDef-interface as it allows joining data based on an attribute-based query, but I need both - a spatial and a attribute-component. Is there any better way then creating one of the filters first, looping the results and checking every feature for the second condition? Maybe by building a temporary table using IQueryTable from the QueryDef-object and than perform a spatial query on it? Thanks in advance 😄 ... View more

Hey around, I have a two featureClasses of type Polygon where the slave-class depends on the master-class. Having said this I want to reshape some portions of the slave-class (I call them Candidates within my code) by the appropriate paths within the master-class. So I start up querying the slaves that belong to a given master-features by using a spatial query (intersect). Now I loop every point within the slave and compare them to the points within the master. I assume the following condition for my candidate: The from-point and the to-point of the Candidate coincide the master-geometry. So I calculate the distance of the points within the slave-geometry to the master-geometry using the IProximityOperator-interface (with master-geom as proxy). A distance of 0 indicates that the point is on the master-geometry. So I build up the candidates as ICurve-members by adding all the points that do NOT coincide the master-geometry and finally append the from- and to-point (which DO coincide). Now I have a set of candidates that represent ICurve-members. The following code retrieves the candidates: IPointCollection4 points = (IPointCollection4)slave.Feature.Shape; // the points of the slave-feature IPoint fromPoint = null;     // fromPoint of the candidate IPoint toPoint = null;     // toPoint of the candidate IPolyline curve = new PolylineClass();   // the geometry of the candidate to add to the result-list IPointCollection curvePoints = (IPointCollection)curve; for (int j = 19; j < 22; j++)    // consider only these three points { // iterate through the points of the slave-geometry IPoint point = points.get_Point(j); double distance = proxy.ReturnDistance(point); // distance from every point within the slave to the master-geometry if (distance > TestClass.Tolerance) // point is totally outside {       // does not happen in our test-case   // ... } else if (distance < TestClass.Tolerance && distance > 0) // point is within the tolerance so it might be a candidate {    curvePoints.AddPoint(point); } else {   // point touches the outline of the feature. These touching points form the borders of the correction   if (fromPoint == null) fromPoint = point; // set the fromPoint if not exists   toPoint = point;    // set the toPoint   // terminate the candidate and append it to the result   IRelationalOperator relOp = (IRelationalOperator)fromPoint;   if (!relOp.Equals(toPoint))   {    // terminate the current curve    // add the fromPoint to the curve    object before = (object)0;    object after = Type.Missing;    curvePoints.AddPoint(fromPoint, ref before, ref after);    // add the toPoint to the curve    curvePoints.AddPoint(toPoint);    fromPoint = point;  // make the current toPoint the next fromPoint    toPoint = null;           Candidate candidate = new Candidate(curve);// build a new (temporary) candidate from the curve    result.Add(candidate);   } } } What I do next is getting the actual reshaper-geometry from the master-feature. Therefor I extract the portion of the master-geometry that fits from- and to-point of my candidate using this code: IPoint fromPoint = this.Geometry.FromPoint; // "this" is the candidate we retrieved in the previos code IPoint toPoint = this.Geometry.ToPoint; double fromDistance = 0, toDistance = 0;   // distances along the curve // if these variables are not equal 0 the given point does not belong to the curve double fromAcrossDistance = 0, toAcrossDistance = 0; // distances across the curve // get the ring that forms the masterGeometry in order to access the methods for querying near points IRing ring = new RingClass(); ((ISegmentCollection) ring).AddSegmentCollection((ISegmentCollection) masterGeometry); // calculate the distance of the fromPoint to the master-geometries along its curve ring.QueryPointAndDistance(esriSegmentExtension.esriNoExtension, fromPoint, false, null, ref fromDistance, ref fromAcrossDistance, false); // calculate the distance of the toPoint to the master-geometries along its curve ring.QueryPointAndDistance(esriSegmentExtension.esriNoExtension, toPoint, false, null, ref toDistance, ref toAcrossDistance, false); // when either the from- or the toPoint does not coincide with the geometry we return an empty curve    // obviously here is the problem // although we got the from- and toPoints of the candidate (this) by checking if their distance to the masterGeometry is 0 we get some (quite small) // difference to 0 in the distances accross the curve if (fromAcrossDistance > 0 || toAcrossDistance > 0) return (ICurve) new Path(); What is strange in here is that for the same candidate (whose from- and to-point are on the master-geometry, compare condition) we get from/toAcrossDistances that are not exactly 0 but sth. around 0.0000009 or so. why do IRing#QueryPointAndDistance and IProximityOperator#ReturnDistance behave so different and how can I avoid this? I hope that you can follow my thoughts and help me finding out the issue behind. I append two shape-files with the mentioned features also. Bye ... View more

Hey there, after being glad to have solved my last problem I just come up with a new one which I can´t figure out. When reshaping a polygon I use Ring#Reshape(IPath), which gives me a boolean if all worked fine. Unfortunelty it won´t give me any return-value but an exception which is -2147220936. I just looked the codes and found NETWORK_E_EDIT_SESSION_IN_PROGRESS but as the last problem wasn´t related with any Network-features (since I do not use them at all) I´ll bet this error has also nothing to do with this confusing message. So I googled for the error-code and found out that the actual error-message to this code is "The coordinates or measures are out of bounds." (which I cannot conform again as I do not receive any error-message). But as the concerned feature is located in the centre of my featureClass I cannot imagine this is really the clue. So which error is right and what exactly does it have to do with my problem of reshaping an IRing? ... View more