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QueryPolygon Error
This is a discussion on QueryPolygon Error within the Development forums, part of the MapPoint 2006/2009 Discussion category; Hi. I am using the ActiveX control that shipped with MapPoint 2006 in a VB.NET 2005 Windows Forms application. I'm ...
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12-28-2007
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| QueryPolygon Error I am using the ActiveX control that shipped with MapPoint 2006 in a VB.NET 2005 Windows Forms application. I'm trying to get a recordset containing all the pushpins within the currently displayed portion of the map by plotting out a rectangle that represents the bounds of the map and passing the coordinates to the querypolygon method of the dataset object. The code is below. Dim locations(5) As MapPoint.Location locations(0) = objMap.XYToLocation(0, 0) locations(1) = objMap.XYToLocation(objMap.Width, 0) locations(2) = objMap.XYToLocation(objMap.Width, objMap.Height) locations(3) = objMap.XYToLocation(0, objMap.Height) locations(4) = objMap.XYToLocation(0, 0) Dim objDataSet As MapPoint.DataSet = objMap.DataSets("My Pushpins") Dim objRecordset As MapPoint.Recordset = objDataSet.QueryPolygon(locations) When querypolygon is executed, I get the following message: "The parameter is incorrect." I've looked at a number of examples and played around with the code a bit, but I can't figure out what I'm doing wrong. Anyone have any ideas? Thanks.         |
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12-28-2007
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 Re: QueryPolygon Error
It's a simple problem: Your array of Locations is dimensioned too large. Instead use Dim locations(4) As MapPoint.Location In VB.Net, the zero-base is assumed, so you were actually creating a 6-item array, the last of which was not initialized. HTH -Paul |
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