Delphi 中的 XMLDocument 类详解(5) - 获取元素内容

unit Unit1;



interface



uses

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

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



type

  TForm1 = class(TForm)

    XMLDocument1: TXMLDocument;

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    Button4: TButton;

    procedure FormCreate(Sender: TObject);

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

    procedure Button4Click(Sender: TObject);

  private

    { Private declarations }

  public

    { Public declarations }

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



//打开

procedure TForm1.FormCreate(Sender: TObject);

begin

  XMLDocument1.LoadFromFile('c:\temp\test.xml');

  {必须用万一提供的 xml 测试文件, 才能有相同的返回值}

end;





//访问第一个人的信息

procedure TForm1.Button1Click(Sender: TObject);

begin

  ShowMessage(XMLDocument1.DocumentElement.ChildNodes[0].ChildNodes['姓名'].Text); {张三}

  ShowMessage(XMLDocument1.DocumentElement.ChildNodes[0].ChildNodes['性别'].Text); {男}

  ShowMessage(XMLDocument1.DocumentElement.ChildNodes[0].ChildNodes['年龄'].Text); {34}

  {可以通过位置访问子节点, 如: ChildNodes[0] 表示子节点列表中的第一个元素}

  {可以通过子节点名访问子节点, 如: ChildNodes['姓名']}

  {但在节点名一样的情况下, 只能通过位置访问}

  {任何情况下都可以通过位置访问, 譬如:}

  ShowMessage(XMLDocument1.DocumentElement.ChildNodes[0].ChildNodes[0].Text); {张三}

end;





//访问第二个人的信息

procedure TForm1.Button2Click(Sender: TObject);

var

  nodeList: IXMLNodeList;

  node: IXMLNode;

begin

  nodeList := XMLDocument1.DocumentElement.ChildNodes;

  node := nodeList[1];



  ShowMessage(node.ChildNodes['姓名'].Text); {李四}

  ShowMessage(node.ChildNodes['性别'].Text); {女}

  ShowMessage(node.ChildNodes['年龄'].Text); {43}

end;





//获取所有成员姓名

procedure TForm1.Button3Click(Sender: TObject);

var

  nodeList: IXMLNodeList;

  node: IXMLNode;

  num,i: Integer;

begin

  nodeList := XMLDocument1.DocumentElement.ChildNodes;

  num := nodeList.Count;



  for i := 0 to num - 1 do

  begin

    node := nodeList[i];

    ShowMessage(node.ChildNodes['姓名'].Text); {会分别显示: 张三 李四 王五 孙六}

  end;

end;





//获取所有成员年龄

procedure TForm1.Button4Click(Sender: TObject);

var

  nodeList: IXMLNodeList;

  node: IXMLNode;

  num,i: Integer;

begin

  nodeList := XMLDocument1.DocumentElement.ChildNodes;

  num := nodeList.Count;



  for i := 0 to num - 1 do

  begin

    node := nodeList[i];

    ShowMessage(node.ChildValues['年龄']); {会分别显示: 34 43 25 52}

  end;

end;



end.