Delphi使用JSON

JSON(JavaScript Object Notation) 是一种轻量级的数据交换格式。易于人阅读和编写，同时也易于机器解析和生成。它基于JavaScript（Standard ECMA-262 3rd Edition - December 1999）的一个子集。 JSON采用完全独立于语言的文本格式，但是也使用了类似于C语言家族的习惯（包括C, C++, C#, Java, JavaScript, Perl, Python等）。这些特性使JSON成为理想的数据交换语言。

Delphi7中不支持JSON文件的解析，可以下载LkJSON(一个JSON的解析文件)，然后进行解析。例如

unit Unit1;
interface
uses
  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
  Dialogs, StdCtrls;
type
  TForm1 = class(TForm)
    Button1: TButton;
    memo1: TMemo;
    Memo2: TMemo;
    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
uses uLkJSON,PerlRegEx;
{$R *.dfm}
procedure listarray(returnval: string; memo: Tmemo);
var
  json, item: TlkJSONbase;
  i: integer;
  list: TlkJSONObject;
  str: TlkJSONstring;
begin
  json := TlkJSON.ParseText(returnval);
for i := 0 to pred(json.Count) do
begin
    item := TlkJSONObject(json).child[i];
// This is the named array, name in name, the array in Objvalue
    Memo.Lines.Add(TlkJSONobjectmethod(item).name);
// list:=TlkJSONobject(TlkJSONobjectmethod(item).Objvalue);
end;
end;
procedure getlist(returnval: string; memo: Tmemo);
var
  Jstart: TlkJSONbase;
  jAddr: TlkJSONList;
  s: string;
begin
  Jstart := TlkJSON.ParseText(returnval) as TlkJSONobject;
//Jstart.field 为jbase时，
  s := vartostr(Jstart.Field['mac'].Field['lv'].Value);
  memo.Lines.add(s);
//Jstart.field 有子数据为jslist时
  s := vartostr(Jstart.Field['ranch'].Field['ranchs'].Child[1].field['hp'].Value);
  memo.Lines.add(s);
end;
procedure getlist1(returnval: string; memo: Tmemo);
var
  Jstart: TlkJSONbase;
  jAddr: TlkJSONList;
  s: string;
begin
  Jstart := TlkJSON.ParseText(returnval) as TlkJSONobject;
//Jstart.field 为jbase时，
  s := vartostr(Jstart.Field['list'].Field['key'].Value);
  memo.Lines.add(s);
//Jstart.field 有子数据为jslist时
  s := vartostr(Jstart.Field['list'].Field['script'].field['main'].Field['key'].Value);
  memo.Lines.add(s);
end;
procedure TForm1.Button1Click(Sender: TObject);
var
  vJsonObj: TlkJsonObject;
  vJsonStr: string;
begin
  memo1.Lines.Clear;
  Memo2.Lines.Clear;
  vJsonObj := TlkJSONstreamed.loadfromfile('d:\json2.txt') as TlkJsonObject;
  vJsonStr := TlkJSON.GenerateText(vJsonObj);
  memo1.Text := vjsonstr;
  listarray(memo1.Text, memo2);
  Memo2.Lines.Add('');
  getlist(memo1.Text, memo2);
end;
procedure TForm1.Button2Click(Sender: TObject);
var
  vJsonObj: TlkJsonObject;
  vJsonStr: string;
begin
  memo1.Lines.Clear;
  Memo2.Lines.Clear;
  vJsonObj := TlkJSONstreamed.loadfromfile('d:\json.txt') as TlkJsonObject;
  vJsonStr := TlkJSON.GenerateText(vJsonObj);
  memo1.Text := vjsonstr;
  listarray(memo1.Text, memo2);
  Memo2.Lines.Add('');
  getlist1(memo1.Text, memo2);
end;

end.

其中json.txt文件内容为：

{

"ranch":

{"lv":"10","fg":"433","fd":"440","j":"2","ranchs":

[{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"0","stat":"0","item":"1014","fif":"0"},

{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"1","stat":"0","item":"1014","fif":"0"},

{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"2","stat":"0","item":"1014","fif":"0"},

{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"3","stat":"0","item":"1014","fif":"0"},

{"tti":46800,"ti":5053,"we":"0","wo":"0","ar":"4","ph":1,"num":57,"or":57,"hp":"100","se":"3","pt":38,"st":0,"id":"4","stat":"0","item":"1014","fif":"1"},

{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"5","stat":"0","item":"1014","fif":"0"},

{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"6","stat":"0","item":"1014","fif":"0"},

{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"7","stat":"0","item":"1014","fif":"0"},

{"tti":0,"ti":0,"we":"0","wo":"0","ar":"0","ph":6,"num":56,"or":57,"hp":"100","se":"2","pt":38,"st":0,"id":"8","stat":"0","item":"1014","fif":"0"},

{"tti":46800,"ti":5048,"we":"0","wo":"0","ar":"4","ph":1,"num":57,"or":57,"hp":"99","se":"3","pt":38,"st":0,"id":"9","stat":"0","item":"1014","fif":"1"},

{"tti":46800,"ti":5050,"we":"0","wo":"0","ar":"4","ph":1,"num":57,"or":57,"hp":"96","se":"3","pt":38,"st":0,"id":"10","stat":"0","item":"1014","fif":"1"},

{"id":"11","stat":"0","item":"0","fif":"0"}]

},

"de":[],

"pi":

{"id":"1054966","uid":"26905522","n":"pan","lv":"26","exp":15886,"gg":"620564","db":"50","gold":0,"etn":21870,"sc":"156","gc":"195",

"ac":

{"sp":4370,"id":12}},"gc":"0","task":{"tid":"0","ti":"5","ht":0},"nc":1,"df":0,"mac":{"lv":"12","exp":989,"en":"133.00"},

"npt":

["501","502","508","509","510","521","504","505","507","520","512","511","513","522","524","525","515","516","514","523","526"],

"sks":

[{"id":101,"lv":"1"},{"id":100,"lv":"1"},{"id":102,"lv":"1"}],

"wt":"3",

"lu":{"fl":0},

"re":{"c":-1},

"ti":1263460473,

"sn":"happyRanchZone",

"cmd":1002

}

}

}

json2.txt文件内容为：

{

"list":

{

"key":"fkey",

"class":"compeditor",

"caption":"公司信息",

"showtype":1,

"script":{

"main":{"key":11100003,"step":1}

}

},

"editer":

{

"caption":"公司信息"

}

}