Knowledge Base



KB10668 - Store/read the configuration for in-memory (non-persistent) layer.

The configuration for an in-memory layer must be added. (This cannot be handled in the project file because the project file contains no knowledge how to recreate a non-persistent layer.)

For example:

procedure TfrmMain.createLayerAndSaveConfig;
var
  ll : TGIS_LayerVector ;
begin
  ll := TGIS_LayerVector.Create ;

  ll.StoreParamsInProject := False ; // DK8 only
  ll.ConfigName := 'mylayer.ini' ;
  ll.Params.Area.Color := clRed;
  ll.WriteConfig ; // copy layer parmeters to configuration file
  ll.SaveAll ; // to save all changes including ini file
end;

procedure TfrmMain.createLayerAndReadConfig;
var
  ll : TGIS_LayerVector ;
begin
  ll := TGIS_LayerVector.Create ;

  ll.StoreParamsInProject := False ; // DK8 only
  ll.ConfigName := 'mylayer.ini' ;
  ll.RereadConfig ;

  if ll.Params.Area.Color = clRed then begin
    ShowMesssage( 'Bingo!')
  end ;
end;

TGIS_Viewer.OnLayerAdd & OnLayerDelete can be used to automate such process.

Parameters will be to read/write from the .INI file only if such file exists. If you want to create a new .INI file, create an empty text file just before calling WriteConfig method.

Created: January 10, 2006, Modified: January 04, 2016