Pascal (Lazarus/Delphi)

Convert a MIME Part's ASN.1 Body to XML

Demonstrates the Chilkat Mime.AsnBodyToXml method, which parses the current part's decoded body as ASN.1 DER and returns an XML representation of the ASN.1 structure. It takes no arguments.

Tip: Code to parse the returned XML can be generated at Chilkat Tools.

Note: The file path is relative to the application's current working directory. Absolute paths may also be used. Supply the path to your own file.

Background: ASN.1 DER is the binary encoding behind PKCS #7/CMS structures — the signatures and encrypted blobs in S/MIME — and it is opaque to the naked eye. Rendering it as XML exposes the nested structure (content types, certificates, signer info) so you can inspect exactly what a signature or encrypted part contains. It is primarily a diagnostic and learning tool.

Chilkat Pascal (Lazarus/Delphi) Downloads

Download Chilkat for Pascal (Lazarus/Delphi)

Pascal (Lazarus/Delphi)

program ChilkatDemo;

// Demonstrates using the Chilkat Pascal wrapper via the C bridge DLL.
// Builds as a console application under Lazarus (FPC) or Delphi.

{$IFDEF FPC}
  {$MODE DELPHI}
{$ENDIF}
{$APPTYPE CONSOLE}

uses
  {$IFDEF UNIX}
  cthreads,
  {$ENDIF}
  SysUtils,
  CkDllLoader,
  Chilkat.Mime;

// ---------------------------------------------------------------------------

procedure RunDemo;
var
  success: Boolean;
  mime: TMime;
  asnXml: string;

begin
  success := False;

  //  Demonstrates the Mime.AsnBodyToXml method, which parses the current part's decoded body as
  //  ASN.1 DER and returns an XML representation of the ASN.1 structure.  It takes no arguments.
  //  This is primarily useful for inspecting binary ASN.1 content such as PKCS #7 structures.

  mime := TMime.Create;
  success := mime.LoadMimeFile('qa_data/pkcs7_part.p7m');
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;

  asnXml := mime.AsnBodyToXml();
  if (mime.LastMethodSuccess = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;
  WriteLn(asnXml);
  //  Code to parse this XML can be generated at Chilkat's online tool:
  //  https://tools.chilkat.io/xmlParse


  mime.Free;

end;

// ---------------------------------------------------------------------------

begin

  try
    RunDemo;
  except
    on E: Exception do
      WriteLn('Unhandled exception: ', E.ClassName, ': ', E.Message);
  end;

  WriteLn;
  {$IFDEF MSWINDOWS}
  WriteLn('Press Enter to exit...');
  ReadLn;
  {$ENDIF}
end.