delphi创建和读取xml（xml简单操作举例）

这篇文章是转载的，补充一个内容：

TXMLDocument在构建的时候，如果需要读取xml文件，那么Create的参数一定要写，不能是nil，否则会报错，如Xml := TXMLDocument.Create(Application);只要引用了forms单元，Application就可用了。

unit Unit1;

interface

uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs,XMLDoc,XMLIntf, StdCtrls;

type
TForm1 = class(TForm)
Button1: TButton;
Button2: TButton;
Memo1: TMemo;
procedure Button1Click(Sender: TObject);
procedure Button2Click(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
end;

var
Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.Button1Click(Sender: TObject);
var
Xml: TXMLDocument;
Rootnode,node : IXMLNode;
begin
Xml := TXMLDocument.Create(nil);
// Xml.LoadFromFile(‘aaa.xml’);
try
//加入版本信息 ‘<?xml version=”1.0″ encoding=”GB2312″ ?> ’
Xml.Active := True;
Xml.Version := ‘1.0’;
Xml.Encoding :=’GB2312′;

Rootnode := Xml.CreateNode(‘CIF_INFO’);
Xml.DocumentElement := Rootnode;
node := Xml.CreateNode(‘TXNCODE’);
Rootnode.ChildNodes.Add(node);
node.Text := ‘420001’;
node := Xml.CreateNode(‘RESPCODE’);
Rootnode.ChildNodes.Add(node);
node.Text := ‘0000’;
node := Xml.CreateNode(‘CIFID’);
Rootnode.ChildNodes.Add(node);
node.Text := ‘0030209728’;
node := Xml.CreateNode(‘RESCODE’);
Rootnode.ChildNodes.Add(node);
node.Text := ‘0000’;
node := Xml.CreateNode(‘RESMSG’);
Rootnode.ChildNodes.Add(node);
node.Text := ”;

Xml.SaveToFile(‘aaa.xml’);
xml.Active := False;
showmessage(‘创建成功！’);
finally
Xml.Free;
end;
end;

procedure TForm1.Button2Click(Sender: TObject);
var
Xml: TXMLDocument;
Rootnode,node : IXMLNode;
nodelist:IXMLNodeList;
b,c,str :string;
i:Integer;
begin
Xml := TXMLDocument.Create(Application);
try
Xml.LoadFromFile(‘aaa.xml’);
Xml.Active := True;

Rootnode := Xml.DocumentElement;
nodeList :=Rootnode.ChildNodes;
for i:=0 to nodelist.Count-1 do
begin
if Rootnode.ChildNodes[i].NodeValue = null then
begin
c:=’空’;
end
else
begin
c:= Rootnode.ChildNodes[i].NodeValue;
end;
str:=str+c+#13#10;
end;
//b := Rootnode.ChildNodes[ ‘CIFID’].NodeValue;
Memo1.Lines.Add(str);
xml.Active := False;
finally
Xml.Free;
end;
end;
end.