fftclientdemomain.pas

就是这本书的随书代码。包括《实战Delphi 5.x-分布式多层应用系统篇》

unit fFTClientDemoMain;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, Grids, DBGrids, ExtCtrls, DBCtrls, Db, DBClient, MConnect,
  SConnect, ObjBrkr;

type
  TForm2 = class(TForm)
    SocketConnection1: TSocketConnection;
    ClientDataSet1: TClientDataSet;
    DataSource1: TDataSource;
    DBNavigator1: TDBNavigator;
    DBGrid1: TDBGrid;
    edtSystemTime: TEdit;
    edtServerName: TEdit;
    btnGetServerInfo: TButton;
    btnClear: TButton;
    SimpleObjectBroker1: TSimpleObjectBroker;
    procedure btnGetServerInfoClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormDestroy(Sender: TObject);
    procedure btnClearClick(Sender: TObject);
  private
    { Private declarations }
    procedure GetNewServer;
  public
    { Public declarations }
  end;

var
  Form2: TForm2;

implementation

{$R *.DFM}

procedure TForm2.GetNewServer;
begin
  SocketConnection1.Connected := False;
  SocketConnection1.Host := SimpleObjectBroker1.GetComputerForProgID ('PFTDemoServer.FTDemoServer') ;
  SocketConnection1.Connected := True;
end;

procedure TForm2.btnGetServerInfoClick(Sender: TObject);
var
  vServerTime : OleVariant;
  vServerName : OleVariant;
begin
  try
    SocketConnection1.AppServer.GetSystemTime(vServerTime);
    SocketConnection1.AppServer.GetServerName(vServerName);
    edtSystemTime.Text := vServerTime;
    edtServerName.Text := vServerName;
  except
    on Exception do
    begin
      SimpleObjectBroker1.SetConnectStatus (SocketConnection1.Host, False) ;
      GetNewServer;
      btnGetServerInfoClick(Sender) ;
    end;
  end;
end;

procedure TForm2.FormCreate(Sender: TObject);
begin
  SocketConnection1.Connected := True;
  ClientDataSet1.Active := True;
end;

procedure TForm2.FormDestroy(Sender: TObject);
begin
  ClientDataSet1.Active := False;
  SocketConnection1.Connected := False;
end;

procedure TForm2.btnClearClick(Sender: TObject);
begin
  edtSystemTime.Clear;
  edtServerName.Clear;
end;

end.