黄聪：Delphi的流(5)--组件序列化

源代码：
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unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Memo1: TMemo;
    Button1: TButton;
    Button2: TButton;
    Button3: TButton;
    Button4: TButton;
    procedure Button1Click(Sender: TObject);
    procedure Button2Click(Sender: TObject);
    procedure Button3Click(Sender: TObject);
    procedure Button4Click(Sender: TObject);
  private
    { Private declarations }
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;

    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}
{$APPTYPE CONSOLE}
var
  fPath:string;

constructor TForm1.Create(AOwner: TComponent);
begin
  inherited;
  memo1.Text:='这好像和流没什么关系, 其实这就是流的典型操作,'+
  'WriteComponentResFile 和 ReadComponentResFile 分别调用了流类的'+
  'WriteComponentRes 与 ReadComponentRes 方法.'+
  '下面用更直接的流的方式重新实现一次';

  fPath:=ExtractFilePath(Application.ExeName)+'test.dat';

end;

destructor TForm1.Destroy;
begin
  inherited;
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  WriteComponentResFile(fPath,memo1);
  memo1.Clear;
  ShowMessage('组件memo1序列保存成功！');
end;

procedure TForm1.Button2Click(Sender: TObject);
begin
  ReadComponentResFile(fPath,memo1);
end;

{
  上面的操作好像和流没什么关系, 其实这就是流的典型操作,
  WriteComponentResFile 和 ReadComponentResFile 分别调用了流类的
  WriteComponentRes 与 ReadComponentRes 方法.
  下面用更直接的流的方式重新实现一次:
}

procedure TForm1.Button3Click(Sender: TObject);
var
  stream:TStream;
begin
  stream:=TFileStream.Create(fPath,fmCreate);
  stream.WriteComponentRes(memo1.ClassName,memo1);
  //WriteComponentRes方法首先往流中写入标准Windows 资源文件头，
  //然后将Instance指定的部件写入流中
  //资源文件头可以取任意字符串都可以

  //writeln(memo1.classname);
  stream.Free;
  memo1.Clear;
  ShowMessage('组件memo1序列保存成功！');
end;

procedure TForm1.Button4Click(Sender: TObject);
var
  stream:TStream;
begin
  stream:=TFileStream.Create(fPath,fmOpenRead);
  stream.ReadComponentRes(memo1);
  stream.Free;
end;

end.

界面代码：
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object Form1: TForm1
  Left = 1174
  Top = 520
  Width = 386
  Height = 288
  Caption = '组件序列化  猪悟能'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  OldCreateOrder = False
  PixelsPerInch = 96
  TextHeight = 13
  object Memo1: TMemo
    Left = 16
    Top = 16
    Width = 345
    Height = 137
    Lines.Strings = (
      'Memo1')
    TabOrder = 0
  end
  object Button1: TButton
    Left = 24
    Top = 168
    Width = 153
    Height = 25
    Caption = 'WriteComponentResFile'
    TabOrder = 1
    OnClick = Button1Click
  end
  object Button2: TButton
    Left = 192
    Top = 168
    Width = 153
    Height = 25
    Caption = 'ReadComponentResFile'
    TabOrder = 2
    OnClick = Button2Click
  end
  object Button3: TButton
    Left = 24
    Top = 208
    Width = 153
    Height = 25
    Caption = 'stream.WriteComponentRes'
    TabOrder = 3
    OnClick = Button3Click
  end
  object Button4: TButton
    Left = 192
    Top = 208
    Width = 153
    Height = 25
    Caption = 'stream.ReadComponentRes'
    TabOrder = 4
    OnClick = Button4Click
  end
end

源代码下载：http://www.rayfile.com/files/ac8f9adc-431e-11df-861a-0015c55db73d/