go
//根据InPath路径,查询mcjson中的值 如果该路径不存在,则创建该路径并赐予''空值
// InJson json数据
//查询json路径格式 InPath:='601988\策略名1\日期5\参数2';
function TForm1.GegMcJsonValue(var InJson:TMcJsonItem;InPath:string): Variant;
var
// InJson: TMcJsonItem;
List1:TStringList;
JSPath:string;
str1,str2:string;
ifor1:Integer;
begin
// InJson := TMcJsonItem.Create;
Result :='';
if InJson.Path(InPath)<>nil then begin
Result :=InJson.Path(InPath).Value;
exit;
end;
try
List1:=TStringList.Create;
// InJson.AsJSON := '{"601988":{"策略名1": {"日期1":{"参数1":1,"参数2":1}}}}';
str1:=InPath;//'601988\策略名1\日期5\参数2';
List1.Delimiter := '\';
List1.DelimitedText :=str1;
str1:=List1[0];
for ifor1:=0 to List1.Count -1 do begin
if (ifor1=0) and (InJson.Path(str1)=nil) then
begin
InJson.add(List1[0]).AsJSON:='';
continue;
end;
if ifor1>0 then begin
str2:=str1;
str1:=Format('%s\%s',[str1,List1[ifor1]]);
if InJson.Path(str1)=nil then
begin
InJson.Path(str2).Add(List1[ifor1]).AsJSON:='';
end;
end;
end;
finally
List1.Free;
end;
end;调用方法
go
procedure TForm1.btn5Click(Sender: TObject);
var
N: TMcJsonItem;
str1:string;
outvar:Variant;
begin
N := TMcJsonItem.Create();
N.AsJSON:='{"601988":{"策略名1": {"日期1":{"参数1":1,"参数2":888}}}}';
str1:='601988\策略名1\日期5\参数2';
GegJsonValue(N,str1);
str1:='601988\策略名1\日期5\参数1';
GegJsonValue(N,str1);
str1:='601988\策略名1\日期1\参数2';
outvar:= GegJsonValue(N,str1)+2;
mmo2.Text:=N.AsJSON;
mmo1.Lines.Add(outvar);
n.Free;
end;//<<==========================================
//循环读取key
go
//循环读取key
procedure TForm1.btn6Click(Sender: TObject);
var
N,m: TMcJsonItem;
str1,str2,str3:string;
ifor1,i1:Integer;
begin
N := TMcJsonItem.Create;
m := TMcJsonItem.Create;
try
str1:='{"A1":{"B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}},"B2":{"C1":{"D1":5,"D2":6},"C2":{"D1":7,"D2":8}},"B3":{"C1":{"D1":9,"D2":10},"C2":{"D1":11,"D2":12}}}}';
mmo1.Text:=str1;
N.AsJSON:=str1;
str2:='A1';
i1:= n.Path('A1').Count;
mmo1.Lines.Add(Format('A1下有%d条数据',[i1]));
for ifor1:=0 to i1-1 do begin
str3 := n.Path('A1').Keys[ifor1]; //获取key的名称
mmo1.Lines.Add(Format('A1下的Keys%d = %s ',[ifor1,str3]) );
str1 :=Format('%S.%S',[str2,str3]);
mmo1.Lines.Add(str1);
if N.Path(str1) <> nil then begin
try
str1 := N.Path(str1).AsString;
mmo1.Lines.Add(Format('找到指定%s值 = %s ',[str2,str1]) ) ;
except
str1 := N.Path(str1).AsJSON;
mmo1.Lines.Add(Format('找到相关%s的JSON = %s ',[str2,str1]) ) ;
end;
end;
end;
finally
N.Free;
end;
end;
javascript
返回值
{"A1":{"B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}},"B2":{"C1":{"D1":5,"D2":6},"C2":{"D1":7,"D2":8}},"B3":{"C1":{"D1":9,"D2":10},"C2":{"D1":11,"D2":12}}}}
A1下有3条数据
A1下的Keys0 = B1
A1.B1
找到相关A1的JSON = "B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}}
A1下的Keys1 = B2
A1.B2
找到相关A1的JSON = "B2":{"C1":{"D1":5,"D2":6},"C2":{"D1":7,"D2":8}}
A1下的Keys2 = B3
A1.B3
找到相关A1的JSON = "B3":{"C1":{"D1":9,"D2":10},"C2":{"D1":11,"D2":12}} //>>==========================================
//<<==========================================
//读取json的值,路径必需指定到最终位置
go
//读取json的值,路径必需指定到最终位置
procedure TForm1.btn7Click(Sender: TObject);
var
N: TMcJsonItem;
str1:string;
begin
str1:='{"A1":{"B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}},"B2":{"C1":{"D1":5,"D2":6},"C2":{"D1":7,"D2":8}}}}';
mmo1.Text:=str1;
N := TMcJsonItem.Create;
try
N.AsJSON :=str1;
str1 :=N.Path('A1.B1.C2.D2').AsString;// str1 :=N['a']['B1'].AT(1).AsString; str1 :=N['a']['B1']['k2'].AsString;
mmo1.Lines.Add(Format('A1.B1.C2.D2 = %s ',[str1]) );
str1 :=N.Path('A1.B1.C2.D2').AsString;
mmo1.Lines.Add(Format('A1.B1.C2.D2= %s ',[str1]) );
str1 :=N.Path('A1').Items[1].Items[1].Items[0].AsString; //str1 :=N.Path('a').AT(1).AT(0).AsString;// str1 :=N['a']['B1'].AT(1).AsString; str1 :=N['a']['B1']['k2'].AsString;
mmo1.Lines.Add(Format('A1.B2.C2.D1= %s ',[str1]));
str1 :=N.AT(0).AT(1).AT(1).AT(0).AsString; //str1 :=N.Path('a').AT(1).AT(0).AsString;// str1 :=N['a']['B1'].AT(1).AsString; str1 :=N['a']['B1']['k2'].AsString;
mmo1.Lines.Add(Format('A1.B2.C2.D1= %s ',[str1]) );
finally
N.Free;
end;
end;
javascript
返回值
{"A1":{"B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}},"B2":{"C1":{"D1":5,"D2":6},"C2":{"D1":7,"D2":8}}}}
A1.B1.C2.D2 = 4
A1.B1.C2.D2= 4
A1.B2.C2.D1= 7
A1.B2.C2.D1= 7 //>>==========================================
//<<==========================================
//找到指定路径值,找到相关路径s的JSON
go
//找到指定路径值,找到相关路径s的JSON
procedure TForm1.btn8Click(Sender: TObject);
var
N: TMcJsonItem;
str1,str2:string;
begin
str1:='{"A1":{"B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}},"B2":{"C1":{"D1":5,"D2":6},"C2":{"D1":7,"D2":8}}}}';
mmo1.Text:=str1;
N := TMcJsonItem.Create;
try
N.AsJSON :=str1;
str1 :='A1.B1';
if N.Path(str1) = nil then
mmo1.Lines.Add(Format('N = %s ',[str1]) ) ELSE mmo1.Lines.Add(Format('Y = %s ',[str1]) );
//<<找到指定值
str1 :='A1.B1.C2.D2';
str2:=str1;
if N.Path(str1) <> nil then begin
try
str1 := N.Path(str1).AsString;
mmo1.Lines.Add(Format('找到指定%s值 = %s ',[str2,str1]) ) ;
except
str1 := N.Path(str1).AsJSON;
mmo1.Lines.Add(Format('找到相关%s的JSON = %s ',[str2,str1]) ) ;
end;
end;
//>>
//<<找到相关的JSON
str1 :='A1.B1'; str2:=str1;
if N.Path(str1) <> nil then begin
try
str1 := N.Path(str1).AsString;
mmo1.Lines.Add(Format('找到指定%s值 = %s ',[str2,str1]) ) ;
except
str1 := N.Path(str1).AsJSON;
mmo1.Lines.Add(Format('找到相关%s的JSON = %s ',[str2,str1]) ) ;
end;
end;
//>>
finally
N.Free;
end;
end;
javascript
返回值
{"A1":{"B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}},"B2":{"C1":{"D1":5,"D2":6},"C2":{"D1":7,"D2":8}}}}
Y = A1.B1
找到指定A1.B1.C2.D2值 = 4
找到相关A1.B1的JSON = "B1":{"C1":{"D1":1,"D2":2},"C2":{"D1":3,"D2":4}} //>>==========================================