DK11 for ActiveX | TatukGIS_XDK11.ITGIS_LayerVector.FindFirst | Methods | Properties
Finds the first shape in layer. Will use RTree if available.
// C# public ITGIS_Shape FindFirst();
' VisualBasic Public Function FindFirst() As ITGIS_Shape
// Oxygene public function FindFirst : ITGIS_Shape;
Type | Description |
---|---|
ITGIS_Shape | Shape itself or nil. |
See: FindNext
Use this method to find to the first shape in the layer matching given criteria. Using _query param we can narrow the result of the shape searching down to the minimum. This should speed up our process of locating a desired shape.
To locate a shape, simply choose an existing layer and use FindFirst method of with a proper extent and a SQL query as a WHERE clause.