Unpack MHT MIME Text into Files

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Demonstrates Mht.UnpackMHTString, which extracts MHT data into its constituent parts: the HTML document and its referenced resources. The source is MHT MIME text supplied as a string.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

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.Mht,
  Chilkat.StringBuilder;

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

procedure RunDemo;
var
  success: Boolean;
  mht: TMht;
  sbMht: TStringBuilder;
  bLoaded: Boolean;

begin
  success := False;

  mht := TMht.Create;

  //  The file paths are relative to the application's current working directory.  Absolute paths may
  //  also be used.  Supply the paths appropriate to your own environment.

  //  Load the MHT MIME text into a string.
  sbMht := TStringBuilder.Create;
  bLoaded := sbMht.LoadFile('qa_data/page.mht','utf-8');
  if (bLoaded <> True) then
    begin
      WriteLn('Failed to load the MHT file.');
      Exit;
    end;

  //  Unpack the MHT MIME text into its constituent parts.  The 1st argument may be MHT MIME text or a
  //  file path; the 2nd is the unpack directory, the 3rd is the main HTML filename, and the 4th is the
  //  sub-directory (relative to the unpack directory) for the referenced parts such as images and style
  //  sheets.
  success := mht.UnpackMHTString(sbMht.GetAsString(),'qa_output/unpacked','index.html','parts');
  if (success = False) then
    begin
      WriteLn(mht.LastErrorText);
      Exit;
    end;
  WriteLn('MHT unpacked.');


  mht.Free;
  sbMht.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.