//序列化到磁盘文件
procedure TTchildA.Button1Click(Sender: TObject);
var
frm: myclass;
fs: Tfilestream;
begin
frm := myclass.Create(self);
frm.sx := 'aaaaaaaaaa';
fs := Tfilestream.Create('c:\xy.txt', fmcreate);
fs.WriteComponent(frm);
fs.Free;end;//反序列化回来使用,那里错了呢??
procedure TTchildA.Button2Click(Sender: TObject);
var
fs: Tfilestream;
my1, my2: myclass;
begin
fs := Tfilestream.Create('c:\xy.txt', fmOpenRead);
my2 := fs.ReadComponent(my2); //这句不对呢??
my2 := myclass(my1);
ShowMessage(my2.sx);
end;
procedure TTchildA.Button1Click(Sender: TObject);
var
frm: myclass;
fs: Tfilestream;
begin
frm := myclass.Create(self);
frm.sx := 'aaaaaaaaaa';
fs := Tfilestream.Create('c:\xy.txt', fmcreate);
fs.WriteComponent(frm);
fs.Free;end;//反序列化回来使用,那里错了呢??
procedure TTchildA.Button2Click(Sender: TObject);
var
fs: Tfilestream;
my1, my2: myclass;
begin
fs := Tfilestream.Create('c:\xy.txt', fmOpenRead);
my2 := fs.ReadComponent(my2); //这句不对呢??
my2 := myclass(my1);
ShowMessage(my2.sx);
end;
var
fs: Tfilestream;
my1,my2: myclass;
begin
my1 := myclass.Create(self);
fs := Tfilestream.Create('c:\xy.txt', fmOpenRead);
my1 := myclass(fs.ReadComponent(my1));
fs.Free;
ShowMessage(my2.sx);//是空的,我赋了值的呀?? frm.sx := 'aaaaaaaaaaaaaaaaaaaa';
end;
procedure TForm1.Button2Click(Sender: TObject);
var
fs: Tfilestream;
my2: myclass;
begin
fs := Tfilestream.Create('d:\xy.txt', fmOpenRead);
my2 := myclass.create(self); //增加这一句
fs.ReadComponent(my2);
ShowMessage(my2.sx);end;其中 myclass 的SX 必须是published我是这个定义的
type myclass = class(TComponent)
public
Fsx : string;
published
property sx:string read Fsx write Fsx;
end;
对,必须继承TComponent,按我上面写的,已经可以正确运行。
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;type
TForm1 = class(TForm)
btn1: TButton;
btn2: TButton;
procedure btn1Click(Sender: TObject);
procedure btn2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end; TMyClass = class(TComponent)
constructor Create(AOwner:TComponent);override;
private
fsx : string;
published
property PFsx: string read fsx write fsx;
end ;var
Form1: TForm1;implementation{$R *.dfm}{ MyClass }constructor TMyClass.Create(AOwner: TComponent);
begin
inherited;
end;procedure TForm1.btn1Click(Sender: TObject);
var
fs: TFileStream;
MyClass: TMyClass;
begin
//
MyClass := TMyClass.Create(Self);
MyClass.PFsx := 'abcd';
fs := TfileStream.Create('E:\data.dat',fmOpenWrite or fmCreate);
try
fs.WriteComponent(MyClass);
finally
fs.Free();
end;end;procedure TForm1.btn2Click(Sender: TObject);
var
fs: TFileStream;
myclass: TComponent;
begin
//
fs := TfileStream.Create('E:\data.dat',fmOpenread);
try
myclass := fs.ReadComponent(nil);
ShowMessage('Result:');
ShowMessage(TMyClass(myclass).PFsx);
finally
fs.Free();
end;
end;initialization
RegisterClasses([TMyClass]);end.