Pascal (Lazarus/Delphi)

Parse MIME Header Fields

See more MIME Examples

Demonstrates how to parse MIME header fields, including Content-Type, Content-Disposition, and Content-Transfer-Encoding.

This example uses a MIME test file located at http://www.chilkatsoft.com/testData/sampleMime2.txt. It contains the following MIME:

Content-Type: multipart/mixed;
 boundary="------------080707010302060306060800";

This is a multi-part message in MIME format.

--------------080707010302060306060800
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body.
--------------080707010302060306060800
Content-Disposition: attachment; filename="starfish.gif";
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif";

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
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--------------080707010302060306060800--

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;
  part2: TMime;
  filename: string;
  name: string;

begin
  success := False;

  //  This example requires the Chilkat API to have been previously unlocked.
  //  See Global Unlock Sample for sample code.

  mime := TMime.Create;

  //  Load the sampleMime2.txt file into the MIME object.
  //  (This file is available at http://www.chilkatsoft.com/testData/sampleMime2.txt )

  success := mime.LoadMimeFile('sampleMime2.txt');
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;

  //  The GIF image is the 2nd sub-part located directly under the
  //  top-level MIME node.  Indexing begins at 0, therefore the 2nd
  //  sub-part is at index 1.
  part2 := TMime.Create;
  success := mime.PartAt(1,part2);
  if (success = False) then
    begin
      WriteLn(mime.LastErrorText);
      Exit;
    end;

  //  -------------------------------
  //  Content-Disposition
  //  -------------------------------
  //  In this example, the Content-Disposition header field
  //  contains this value:
  //  attachment; filename="starfish.gif";

  //  To get the "filename", call GetHeaderFieldAttribute
  //  Header field names and attribute names are case insensitive.
  filename := part2.GetHeaderFieldAttribute('Content-Disposition','filename');
  WriteLn('Filename: ' + filename);

  //  Because the "filename" is so often accessed, it is also available
  //  by accessing the "Filename" property:
  WriteLn('Filename: ' + part2.Filename);

  //  The disposition (without attributes) which in this case 
  //  is the string "attachment" is accessed via the Disposition property:
  WriteLn('Disposition: ' + part2.Disposition);

  //  To get the full value of the Content-Disposition header field,
  //  call GetHeaderField.
  WriteLn('Content-Disposition: ' + part2.GetHeaderField('Content-Disposition'));

  //  -------------------------------
  //  Content-Type
  //  -------------------------------
  //  In this example, the Content-Type header field
  //  contains this value:
  //  image/gif; name="starfish.gif";

  //  To get the "name", call GetHeaderFieldAttribute
  name := part2.GetHeaderFieldAttribute('Content-Type','name');
  WriteLn('Content-Type name: ' + name);

  //  Because the "name" is so often accessed, it is also available
  //  by accessing the "Name" property:
  WriteLn('Content-Type name: ' + part2.Name);

  //  The content-type without attributes is available in the
  //  ContentType property:
  WriteLn('Content-Type: ' + part2.ContentType);

  //  To get the full value of the Content-Type header field,
  //  call GetHeaderField.
  WriteLn('Content-Type: ' + part2.GetHeaderField('Content-Type'));

  //  -------------------------------
  //  Content-Transfer-Encoding
  //  -------------------------------

  //  The Encoding property contains the value of the
  //  Content-Transfer-Encoding property. 
  //  Calling GetHeaderField("Content-Transfer-Encoding") is
  //  equivalent to accessing the Encoding property:
  WriteLn('Content-Transfer-Encoding: ' + part2.Encoding);
  WriteLn('Content-Transfer-Encoding: ' + part2.GetHeaderField('Content-Transfer-Encoding'));

  WriteLn('Finished.');


  mime.Free;
  part2.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.