Delphi 中的 XMLDocument 类详解(20) - 动态建立 XMLDocument 对象

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, xmldom, XMLIntf, msxmldom, XMLDoc;



type

  TForm1 = class(TForm)

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



//使用 TXMLDocument 类

procedure TForm1.Button1Click(Sender: TObject);

var

  xmlDoc: TXMLDocument;

begin

  xmlDoc := TXMLDocument.Create(nil);

  xmlDoc.LoadFromFile('c:\temp\test.xml');

  ShowMessage(FormatXMLData(xmlDoc.XML.Text));

  FreeAndNil(xmlDoc);

end;





//使用 IXMLDocument 接口

procedure TForm1.Button2Click(Sender: TObject);

var

  xmlDoc: IXMLDocument;

begin

  xmlDoc := TXMLDocument.Create(nil);

  xmlDoc.LoadFromFile('c:\temp\test.xml');

  ShowMessage(FormatXMLData(xmlDoc.XML.Text));

  xmlDoc := nil;

end;





//使用 IXMLDocument 接口的 NewXMLDocument 方法

procedure TForm1.Button3Click(Sender: TObject);

var

  xmlDoc: IXMLDocument;

begin

  xmlDoc := NewXMLDocument;

  xmlDoc.LoadFromFile('c:\temp\test.xml');

  ShowMessage(FormatXMLData(xmlDoc.XML.Text));

  xmlDoc := nil;

end;



end.