Read block, attributes

uses DXF, DXFConv, sgConsts;

...

implementation

procedure TForm1.ReadBlockAttributesClick(Sender: TObject);
var
  vDrawing: TsgCADDXFImage; // a class for reading DXF format
  I, J: Integer;
  // "DXF" in the name of the Line class is used for compatibility
  // use this class for lines in all CAD formats
 
  // An insert is a block reference. Several inserts can reference to the same block.
  vInsert: TsgDXFInsert;
  S: string;
begin
  vDrawing := TsgCADDXFImage.Create; //TsgDXFImage is a class for DXF file reading

                                     //Please use a correspond class to read a drawing of other format.

                                     //For example TsgDWGImage for DWG format, TsgCGMImage for CGM, etc.
  vDrawing.LoadFromFile('Entities.dxf');
// searching entities in the current layout of the drawing
  for I := 0 to vDrawing.CurrentLayout.Count - 1 do
  begin
    if vDrawing.CurrentLayout.Entities[I].EntType = ceInsert then
    begin
      vInsert := TsgDXFInsert(vDrawing.CurrentLayout.Entities[I]);
      for  J := 0 to vInsert.Attribs.Count - 1 do
        S := S + TsgDXFAttrib(vInsert.Attribs[J]).Tag + ' = ' +
          TsgDXFAttrib(vInsert.Attribs[J]).Value + #13;
      ShowMessage('Block name: ' + #13 + vInsert.Block.Name + #13 + S);
    end;
    S := '';
  end;
  vDrawing.Free;
end;