main.pas

《Delphi开发人员指南》配书原码

unit Main;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  DBTables, DB, StdCtrls, ExtCtrls, DBCtrls;

type
  TForm1 = class(TForm)
    Table1: TTable;
    Button1: TButton;
    Table1SpeciesNo: TFloatField;
    Table1Category: TStringField;
    Table1Common_Name: TStringField;
    Table1SpeciesName: TStringField;
    Table1Lengthcm: TFloatField;
    Table1Length_In: TFloatField;
    Table1Notes: TMemoField;
    Table1Graphic: TGraphicField;
    DBNavigator1: TDBNavigator;
    DataSource1: TDataSource;
    procedure Button1Click(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.Button1Click(Sender: TObject);
const
  AStr = 'The %s is of the %s category and its length is %f in.';
var
  VarArr: Variant;
  F: Double;
begin
  VarArr := VarArrayCreate([0, 2], varVariant);
  VarArr := Table1['Common_Name;Category;Length_In'];
  F := VarArr[2];
  ShowMessage(Format(AStr, [VarArr[0], VarArr[1], F]));
end;

end.