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.