testnumf.pas

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unit TestNumF;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, DdhNumEd;

type
  TForm1 = class(TForm)
    DdhNumEdit1: TDdhNumEdit;
    DdhNumEdit2: TDdhNumEdit;
    Label1: TLabel;
    Label2: TLabel;
    procedure DdhNumEdit1InputError(Sender: TObject);
    procedure DdhNumEdit2InputError(Sender: TObject);
    procedure FormCreate(Sender: TObject);
  private
    ErrorCount: Integer;
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.DdhNumEdit1InputError(Sender: TObject);
begin
  Beep;
end;

procedure TForm1.DdhNumEdit2InputError(Sender: TObject);
begin
  Inc (ErrorCount);
  if ErrorCount >= 5 then
  begin
    Beep;
    ShowMessage ('Only numbers, please');
    ErrorCount := 0;
  end;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
  ErrorCount := 0;
end;

end.