delphi 操作xml示例
2009-07-20 17:49
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自：http://www.delphibbs.com/keylife/iblog_show.asp?xid=20713
================================================================
2005-9-23 21:05:34 xml基础操作实例，因为刚开始学，如果有不对的地方，请批评指正，代码如下：
unit XMLOptionUnit;
//==============================================================================
//本实例演示
//1，XML 创建，打开，关闭操作
//2，XML 填加，添加到指定位置，删除，修改（替换），查找等操作
//作者：cactus123456@hotmail.com
//日期：2005.9.23
//版本：1.0
//==============================================================================
interface
uses
SysUtils,ActiveX,MSXML2_TLB;
type
RecUser=Record
U_Id :widestring;
U_Name :widestring;
U_Sex :widestring;
U_Birth :widestring;
U_Tel :widestring;
U_Addr :widestring;
U_PostCode :widestring;
U_Email :widestring;
end;
type
TXMLOption=class
private
FActive :boolean;
FFilename: string;
FXMLDoc :IXMLDOMDocument;
//填加一个子节点
procedure AddSimpleElement(Parent: IXMLDOMElement; Field,Value: string);
public
procedure CreateBlank(Filename: string);
procedure OpenXml(Filename: string);
procedure CloseXml;
procedure AppendUser(muser:RecUser);
procedure InsertUser(uid:string;muser:RecUser);
procedure RemoveUser(uid:string);
procedure ReplaceUser(uid:string;newuser:RecUser);
function FindUser(userid:widestring):boolean;
end;
implementation
const
XMLTag = 'xml';
XMLPrologAttrs = 'version="1.0" encoding="UTF-8"';
XMLComment = '简单XML文档操作用户实例'#13 +
'用户结构为序号，姓名，性别，出生年月日，电话，住址，邮编，电邮'#13 +
'作者 cactus123456@hotmail.com, 2005.9.21';
UserWatcherTag = 'user-watcher';
XMLComment2 = '创建文档时间：';
UsersTag = 'users';
U_Id = 'id';
U_Name = 'name';
U_Sex = 'sex';
U_Birth = 'birth';
U_Tel = 'tel';
U_Addr = 'addr';
U_PostCode = 'postcode';
U_Email = 'email';
//创建一个空XML，如果这个Filename文件已经存在，则覆盖
procedure TXMLOption.CreateBlank(Filename: string);
begin
FActive:=false;
FFilename:='';
try
FXMLDoc := CoDOMDocument.Create;
FXMLDoc.AppendChild(FXMLDoc.CreateProcessingInstruction(XMLTag, XMLPrologAttrs));
FXMLDoc.AppendChild(FXMLDoc.CreateComment(XMLComment));
FXMLDoc.AppendChild(FXMLDoc.CreateElement(UserWatcherTag));
FXMLDoc.AppendChild(FXMLDoc.CreateComment(XMLComment2+datetimetostr(now)));
FXMLDoc.save(Filename);
FFilename:=Filename;
FActive:=true;
except
FXMLDoc:=nil;
end;
end;
//打开一个存在的Filename XML文档
procedure TXMLOption.OpenXml(Filename: string);
begin
if not Assigned(FXMLDoc) then
begin
FXMLDoc := CoDOMDocument.Create;
if FXMLDoc.Load(Filename) then FActive:=true
else FActive:=false;
if FActive then FFilename:=Filename
else FFilename:='';
end;
end;
//关闭一个打开的XML文档
procedure TXMLOption.CloseXml;
begin
if Assigned(FXMLDoc) then FXMLDoc:=nil;
FFilename:='';
FActive:=false;
end;
procedure TXMLOption.AddSimpleElement(Parent: IXMLDOMElement; Field,Value: string);
var
Internal: IXMLDOMElement;
begin
Internal:=IXMLDOMElement(Parent.AppendChild(FXMLDoc.CreateElement(Field)));
Internal.AppendChild(FXMLDoc.CreateTextNode(Value));
end;
//填加一个节点到后面
procedure TXMLOption.AppendUser(muser:RecUser);
var
xuser:IXMLDOMElement;
xroot:IXMLDOMElement;
begin
if FActive then
begin
xroot:=FXMLDoc.documentElement;
xuser :=IXMLDOMElement(xroot.AppendChild(FXMLDoc.CreateElement(UsersTag)));
AddSimpleElement(xuser,U_Id,muser.U_Id);
AddSimpleElement(xuser,U_Name,muser.U_Name);
AddSimpleElement(xuser,U_Sex,muser.U_Sex);
AddSimpleElement(xuser,U_Birth,muser.U_Birth);
AddSimpleElement(xuser,U_Tel,muser.U_Tel);
AddSimpleElement(xuser,U_Addr,muser.U_Addr);
AddSimpleElement(xuser,U_PostCode,muser.U_PostCode);
AddSimpleElement(xuser,U_Email,muser.U_Email);
FXMLDoc.save(FFilename);
end;
end;
procedure TXMLOption.InsertUser(uid:string;muser:RecUser);
var
xfind:IXMLDOMNode;
xuser:IXMLDOMElement;
xroot:IXMLDOMElement;
xpath:string;
begin
if not FActive then exit;
xpath:=UsersTag+'['+U_Id+'="'+uid+'"]';
xfind:=FXMLDoc.documentElement.selectSingleNode(xpath);
//如果没有找到， xfind=nil 则在文件的末尾插入
//如果找到，xfind<>nil 则在找到的纪录前面插入
xroot:=FXMLDoc.documentElement;
xuser :=IXMLDOMElement(xroot.insertBefore(FXMLDoc.CreateElement(UsersTag),xfind));
AddSimpleElement(xuser,U_Id,muser.U_Id);
AddSimpleElement(xuser,U_Name,muser.U_Name);
AddSimpleElement(xuser,U_Sex,muser.U_Sex);
AddSimpleElement(xuser,U_Birth,muser.U_Birth);
AddSimpleElement(xuser,U_Tel,muser.U_Tel);
AddSimpleElement(xuser,U_Addr,muser.U_Addr);
AddSimpleElement(xuser,U_PostCode,muser.U_PostCode);
AddSimpleElement(xuser,U_Email,muser.U_Email);
FXMLDoc.save(FFilename);
end;
procedure TXMLOption.RemoveUser(uid:string);
var
xfind:IXMLDOMNode;
xroot:IXMLDOMElement;
xpath:string;
begin
if not FActive then exit;
xpath:=UsersTag+'['+U_Id+'="'+uid+'"]';
xfind:=FXMLDoc.documentElement.selectSingleNode(xpath);
if xfind<>nil then
begin
xroot:=FXMLDoc.documentElement;
xroot.removeChild(xfind);
FXMLDoc.save(FFilename);
end;
end;
procedure TXMLOption.ReplaceUser(uid:string;newuser:RecUser);
var
xfind,newnode:IXMLDOMNode;
xroot:IXMLDOMElement;
xpath:string;
begin
if not FActive then exit;
xpath:=UsersTag+'['+U_Id+'="'+uid+'"]';
xfind:=FXMLDoc.documentElement.selectSingleNode(xpath);
//如果没有找到，则不做替换
if xfind<>nil then
begin
newnode:=xfind.cloneNode(true);
newnode.selectSingleNode(U_Id).text:=newuser.U_Id;
newnode.selectSingleNode(U_Name).text:=newuser.U_Name;
newnode.selectSingleNode(U_Sex).text:=newuser.U_Sex;
newnode.selectSingleNode(U_Birth).text:=newuser.U_Birth;
newnode.selectSingleNode(U_Tel).text:=newuser.U_Tel;
newnode.selectSingleNode(U_Addr).text:=newuser.U_Addr;
newnode.selectSingleNode(U_PostCode).text:=newuser.U_PostCode;
newnode.selectSingleNode(U_Email).text:=newuser.U_Email;
xroot:=FXMLDoc.documentElement;
xroot.replaceChild(newnode,xfind);
FXMLDoc.save(FFilename);
end;
end;
function TXMLOption.FindUser(userid:widestring):boolean;
var
xuser:IXMLDOMNode;
xpath:string;
begin
result:=false;
if not FActive then exit;
//关于xpath语法说明，参见www.w3.org/TR/xpath
xpath:=UsersTag+'['+U_Id+'="'+userid+'"]';
xuser:=FXMLDoc.documentElement.selectSingleNode(xpath);
if xuser<>nil then result:=true;
end;
initialization
{ Initialise COM }
CoInitialize(nil);
finalization
{ Tidy up }
CoUninitialize();
end.
调用上面单元的实例的代码，unit单元：
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls,XMLOptionUnit, OleCtrls, SHDocVw;
type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Edit1: TEdit;
Edit2: TEdit;
Button3: TButton;
Button4: TButton;
Button5: TButton;
WebBrowser1: TWebBrowser;
Label1: TLabel;
Button6: TButton;
Button7: TButton;
Button8: TButton;
procedure FormCreate(Sender: TObject);
procedure FormDestroy(Sender: TObject);
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
procedure Button3Click(Sender: TObject);
procedure Button4Click(Sender: TObject);
procedure Button5Click(Sender: TObject);
procedure Button6Click(Sender: TObject);
procedure Button7Click(Sender: TObject);
procedure Button8Click(Sender: TObject);
private
{ Private declarations }
FXMLOption:TXMLOption;
public
{ Public declarations }
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
procedure TForm1.FormCreate(Sender: TObject);
begin
FXMLOption:=TXMLOption.Create;
end;
procedure TForm1.FormDestroy(Sender: TObject);
begin
FXMLOption.Free;
end;
procedure TForm1.Button1Click(Sender: TObject);
begin
FXMLOption.CreateBlank(edit1.Text);
end;
procedure TForm1.Button2Click(Sender: TObject);
var
auser:RecUser;
begin
auser.U_Id:=edit2.Text;
auser.U_Name:='tom';
auser.U_Sex:='男';
auser.U_Birth:='1979-8-7';
auser.U_Tel:='1236547890';
auser.U_Addr:='tom 大街 8 号';
auser.U_PostCode:='100018';
auser.U_Email:='tom@888.com';
FXMLOption.AppendUser(auser);
WebBrowser1.Navigate(ExtractFilePath(application.ExeName)+edit1.Text);
end;
procedure TForm1.Button3Click(Sender: TObject);
begin
FXMLOption.OpenXml(edit1.Text);
WebBrowser1.Navigate(ExtractFilePath(application.ExeName)+edit1.Text);
end;
procedure TForm1.Button4Click(Sender: TObject);
begin
FXMLOption.CloseXml;
WebBrowser1.Navigate('about:blank');
end;
procedure TForm1.Button5Click(Sender: TObject);
begin
if FXMLOption.FindUser(edit2.text) then label1.Caption:='true'
else label1.Caption:='false';
end;
procedure TForm1.Button6Click(Sender: TObject);
var
auser:RecUser;
begin
auser.U_Id:=edit2.Text;
auser.U_Name:='peter';
auser.U_Sex:='女';
auser.U_Birth:='1980-8-7';
auser.U_Tel:='36-3654-7890';
auser.U_Addr:='peter 大街 8 号';
auser.U_PostCode:='100018';
auser.U_Email:='peter@888.com';
FXMLOption.InsertUser(edit2.text,auser);
WebBrowser1.Navigate(ExtractFilePath(application.ExeName)+edit1.Text);
end;
procedure TForm1.Button7Click(Sender: TObject);
begin
FXMLOption.RemoveUser(edit2.text);
WebBrowser1.Navigate(ExtractFilePath(application.ExeName)+edit1.Text);
end;
procedure TForm1.Button8Click(Sender: TObject);
var
auser:RecUser;
begin
auser.U_Id:=edit2.Text;
auser.U_Name:='张三';
auser.U_Sex:='男';
auser.U_Birth:='1970-8-7';
auser.U_Tel:='001654-7890';
auser.U_Addr:='张三 大街 8 号';
auser.U_PostCode:='100018';
auser.U_Email:='zhangsan@888.com';
FXMLOption.ReplaceUser(edit2.Text,auser);
WebBrowser1.Navigate(ExtractFilePath(application.ExeName)+edit1.Text);
end;
end.
Unit单元对应的Form：
object Form1: TForm1
Left = 192
Top = 107
Width = 696
Height = 480
Caption = 'Form1'
Color = clBtnFace
Font.Charset = DEFAULT_CHARSET
Font.Color = clWindowText
Font.Height = -11
Font.Name = 'MS Sans Serif'
Font.Style = []
OldCreateOrder = False
OnCreate = FormCreate
OnDestroy = FormDestroy
PixelsPerInch = 96
TextHeight = 13
object Label1: TLabel
Left = 440
Top = 400
Width = 32
Height = 13
Caption = 'Label1'
end
object Button1: TButton
Left = 256
Top = 360
Width = 75
Height = 25
Caption = 'CreateBlank'
TabOrder = 0
OnClick = Button1Click
end
object Button2: TButton
Left = 352
Top = 360
Width = 75
Height = 25
Caption = 'AddUser'
TabOrder = 1
OnClick = Button2Click
end
object Edit1: TEdit
Left = 208
Top = 328
Width = 121
Height = 21
TabOrder = 2
Text = 'userxml.xml'
end
object Edit2: TEdit
Left = 352
Top = 328
Width = 121
Height = 21
TabOrder = 3
Text = '900'
end
object Button3: TButton
Left = 256
Top = 384
Width = 75
Height = 25
Caption = 'OpenXml'
TabOrder = 4
OnClick = Button3Click
end
object Button4: TButton
Left = 256
Top = 408
Width = 75
Height = 25
Caption = 'CloseXml'
TabOrder = 5
OnClick = Button4Click
end
object Button5: TButton
Left = 352
Top = 392
Width = 75
Height = 25
Caption = 'FindUser'
TabOrder = 6
OnClick = Button5Click
end
object WebBrowser1: TWebBrowser
Left = 0
Top = 0
Width = 688
Height = 313
Align = alTop
TabOrder = 7
ControlData = {
4C0000001B470000592000000000000000000000000000000000000000000000
000000004C000000000000000000000001000000E0D057007335CF11AE690800
2B2E126208000000000000004C0000000114020000000000C000000000000046
8000000000000000000000000000000000000000000000000000000000000000
00000000000000000100000000000000000000000000000000000000}
end
object Button6: TButton
Left = 432
Top = 360
Width = 75
Height = 25
Caption = 'InsertUser'
TabOrder = 8
OnClick = Button6Click
end
object Button7: TButton
Left = 512
Top = 360
Width = 75
Height = 25
Caption = 'RemoveUser'
TabOrder = 9
OnClick = Button7Click
end
object Button8: TButton
Left = 512
Top = 392
Width = 75
Height = 25
Caption = 'ReplaceUser'
TabOrder = 10
OnClick = Button8Click
end
end
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