TGIS_LayerVector.FindFirst method

DK11 for Delphi | GisLayerVector.TGIS_LayerVector.FindFirst | Overloads | Constructors | Fields | Methods | Properties | Events

Finds the first shape in layer. Will use RTree if available.

Available also on: .NET | Java | ActiveX | Python.

// Delphi
public
  function FindFirst : TGIS_Shape; overload; virtual;

// C++ Builder
public:
  virtual TGIS_Shape* FindFirst(void) /* overload */;

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.

• Multiselect sample
• SelectByShape sample