(Delphi ActiveX) Extract PDF from JSON

Demonstrates how to extract a PDF file contained within JSON. The file is represented as a base64 string within the JSON. Note: This example can extract any type of file, not just a PDF file.

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

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
json: TChilkatJsonObject;
success: Integer;
sb: TChilkatStringBuilder;
bd: TChilkatBinData;

begin
json := TChilkatJsonObject.Create(Self);

// Load the JSON.
success := json.LoadFile('qa_data/json/JSR5U.json');
if (success <> 1) then
  begin
    Memo1.Lines.Add(json.LastErrorText);
    Exit;
  end;

// The JSON we loaded contains this:

// 	{
// 	...
// 	...
// 	  "data": {
// 	    "content": "JVBERi0xLjQ..."
// 	  }
// 	...
// 	...
// 	}

sb := TChilkatStringBuilder.Create(Self);
json.StringOfSb('data.content',sb.ControlInterface);

bd := TChilkatBinData.Create(Self);
bd.AppendEncodedSb(sb.ControlInterface,'base64');

success := bd.WriteFile('qa_output/a0015.pdf');
end;