System.JSON.Writers.TJsonTextWriter.WriteNull
Delphi
procedure WriteNull; override;
C++
virtual void __fastcall WriteNull();
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
procedure function |
public | System.JSON.Writers.pas System.JSON.Writers.hpp |
System.JSON.Writers | TJsonTextWriter |
Description
Writes a null value.
See the code snippet below to illustrate the use of WriteNull:
Writer.WriteStartObject;
Writer.WritePropertyName('colors');
Writer.WriteStartArray;
Writer.WriteStartObject;
Writer.WriteComment('Hexadecimal value for the red color');
Writer.WritePropertyName('name');
Writer.WriteValue('red');
Writer.WritePropertyName('hex');
Writer.WriteNull;
//Writer.WriteValue('#f00');
Writer.WriteEndObject;
Writer.WriteEndArray;
{
"colors": [
{
/*Hexadecimal value for the red color*/
"name": "red",
"hex": null
}
]
}