jsondataobjects

Posted 2020-12-28 咏南中间件和开发框架

jsondataobjects

GITHUB：

https://github.com/ahausladen/jsondataobjects.git

跨平台JSON库

Json Data Objects
=================

This Delphi unit contains a JSON parser that supports Delphi 2009-10Seattle and the platforms
Win32, Win64 and ARM android (MacOS and ios may work).

Clone with GIT
--------------
```
> git clone [email protected]:ahausladen/JsonDataObjects.git
```
or
```
> git clone https://github.com/ahausladen/JsonDataObjects.git
```

This will get you the Json Data Objects repository.

How to install
--------------
1. Clone the JsonDataObjects repository
2. Add the JsonDataObjects.pas unit to your project.

Features
--------
* Fast dual JSON parser for parsing UTF8 and UTF16 without conversion
* Automatic creation of arrays and objects
* Easy access mode with implicit operators
* Compact and formatted output modes
* Variants support
* Null can be auto-typecasted to a value type if JsonSerializationConfig.NullConvertsToValueTypes is set to True
* Progress callback support for loading large JSON strings
* Win32, Win64 and ARM Android support (MacOS and iOS may work)

Usage
-----
Simple example
```Delphi
var
Obj: TJsonObject;
begin
Obj := TJsonObject.Parse(‘{ "foo": "bar", "array": [ 10, 20 ] }‘) as TJsonObject;
try
ShowMessage(Obj[‘foo‘]);
ShowMessage(IntToStr(Obj[‘array‘].Count));
ShowMessage(IntToStr(Obj[‘array‘].Items[0]));
ShowMessage(IntToStr(Obj[‘array‘].Items[1]));
finally
Obj.Free;
end;
end;
```

Filling and serializing JSON objects
```Delphi
var
Obj, ChildObj: TJsonObject;
begin
Obj := TJsonObject.Create;
try
// easy access
Obj[‘foo‘] := ‘bar‘;
// normal (and faster) access
Obj.S[‘bar‘] := ‘foo‘;
// automatic array creation, Obj is the owner of ‘array‘
Obj.A[‘array‘].Add(10);
Obj.A[‘array‘].Add(20);
// automatic object creation, ‘array‘ is the owner of ChildObj
ChildObj := Obj.A[‘array‘].AddObject;
ChildObj[‘value‘] := 12.3;
// automatic array creation, ChildObj is the owner of ‘subarray‘
ChildObj.A[‘subarray‘].Add(100);
ChildObj.A[‘subarray‘].Add(200);

ShowMessage(Obj.ToJSON({Compact:=}False));
finally
Obj.Free;
end;
```
```JSON
{
"foo": "bar",
"bar": "foo",
"array": [
10,
20,
{
"value": 12.3,
"subarray": [
100,
200
]
}
]
}
```

Copying JSON objects with `Assign`
```Delphi
var
Obj, ClonedObj: TJsonObject;
begin
Obj := TJsonObject.ParseUtf8(‘{ "foo": [ "bar", {}, null, true, false, { "key": "value" } ] }‘) as TJsonObject;
try
ClonedObj := TJsonObject.Create;
try
// Make a copy of Obj
ClonedObj.Assign(Obj);
ShowMessage(ClonedObj.ToJSON(False));
finally
ClonedObj.Free;
end;
finally
Obj.Free;
end;
end;
```
```JSON
{
"foo": [
"bar",
{},
null,
true,
false,
{
"key": "value"
}
]
}
```