(Delphi DLL) 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 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, StringBuilder, BinData, JsonObject;

...

procedure TForm1.Button1Click(Sender: TObject);
var
json: HCkJsonObject;
success: Boolean;
sb: HCkStringBuilder;
bd: HCkBinData;

begin
json := CkJsonObject_Create();

// Load the JSON.
success := CkJsonObject_LoadFile(json,'qa_data/json/JSR5U.json');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkJsonObject__lastErrorText(json));
    Exit;
  end;

// The JSON we loaded contains this:

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

sb := CkStringBuilder_Create();
CkJsonObject_StringOfSb(json,'data.content',sb);

bd := CkBinData_Create();
CkBinData_AppendEncodedSb(bd,sb,'base64');

success := CkBinData_WriteFile(bd,'qa_output/a0015.pdf');

CkJsonObject_Dispose(json);
CkStringBuilder_Dispose(sb);
CkBinData_Dispose(bd);

end;