(Delphi DLL) JSON: Array of Objects

Here we have a JSON object that contains an array, where each element in the array is a JSON object. This example demonstrates how to access the objects contained within an array.

{ 
  "employees":[
    {"firstName":"John", "lastName":"Doe"},
    {"firstName":"Anna", "lastName":"Smith"},
    {"firstName":"Peter","lastName":"Jones"}
  ]
}

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, JsonArray, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
json: HCkJsonObject;
jsonStr: PWideChar;
success: Boolean;
employees: HCkJsonArray;
numEmployees: Integer;
i: Integer;
empObj: HCkJsonObject;

begin
json := CkJsonObject_Create();

// This is the above JSON with whitespace chars removed (SPACE, TAB, CR, and LF chars).
// The presence of whitespace chars for pretty-printing makes no difference to the Load
// method. 
jsonStr := '{"employees":[{"firstName":"John", "lastName":"Doe"},{"firstName":"Anna", "lastName":"Smith"},{"firstName":"Peter","lastName":"Jones"}]}';

success := CkJsonObject_Load(json,jsonStr);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkJsonObject__lastErrorText(json));
    Exit;
  end;

// Get the "employees" array.
employees := CkJsonObject_ArrayOf(json,'employees');
if (CkJsonObject_getLastMethodSuccess(json) = False) then
  begin
    Memo1.Lines.Add('employees member not found.');
    Exit;
  end;

// Iterate over each employee, getting the JSON object at each index.
numEmployees := CkJsonArray_getSize(employees);
i := 0;
while i < numEmployees do
  begin

    empObj := CkJsonArray_ObjectAt(employees,i);

    Memo1.Lines.Add('employee[' + IntToStr(i) + '] = ' + CkJsonObject__stringOf(empObj,'firstName') + ' ' + CkJsonObject__stringOf(empObj,'lastName'));
    CkJsonObject_Dispose(empObj);

    i := i + 1;
  end;

CkJsonArray_Dispose(employees);

CkJsonObject_Dispose(json);

end;