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"
}
}