TGIS_LayerVectorDirectWriteHelper class

DK11 for Delphi | GisLayerVector.TGIS_LayerVectorDirectWriteHelper | Classes | Constructors | Methods | Properties

Helper for direct writing into a layer storage.

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

// Delphi
type
  TGIS_LayerVectorDirectWriteHelper = class
  end;

// C++ Builder
class PASCALIMPLEMENTATION TGIS_LayerVectorDirectWriteHelper

Direct write is the fastest way of adding shapes. It is perfect for batch operation. However, its should be called exclusively - other operations on a layer should not be performed upon use of direct write operation.

var
  lv : TGIS_LayerSHP ;
begin
  // create a new layer, initialize and use in helper
  drh := TGIS_LayerVectorDirectWriteHelper.Create( lv ) ;
  try
    drh.Build( 'c:\tmp\drtest.shp', la.Extent,
               la.DefaultShapeType, la.DefaultDimension
              );
    // write all shapes from another layer
    for shp in la.Loop do
      drh.AddShape( shp ) ;
 
    drh.Close ;
  finally
    FreeObject( drh ) ;
  end ;
end ;

• DirectWrite sample