Delphi DLL

Convert a File's Character Encoding from UTF-8 to UFT-8-BOM

See more HTML-to-XML/Text Examples

To add a utf-8 BOM to a file is just a matter of prepending these 3 bytes to the file: 0xEF 0xBB 0xBF.

This may be difficult in some programming languages, or it may be trivial in either. Therefore, the Chilkat solution you see here might be helpful, or in a language such as C++, the Chilkat solution isn't really necessary because it's easy to do yourself.

Delphi DLL

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

...

procedure TForm1.Button1Click(Sender: TObject);
var
success: Boolean;
charset: HCkCharset;

begin
success := False;

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

charset := CkCharset_Create();

CkCharset_putFromCharset(charset,'utf-8');
CkCharset_putToCharset(charset,'bom-utf-8');

success := CkCharset_ConvertFile(charset,'qa_data/txt/helloWorld.txt','qa_output/helloWorldBom.txt');
if (success <> True) then
  begin
    Memo1.Lines.Add(CkCharset__lastErrorText(charset));
    Exit;
  end;

Memo1.Lines.Add('Success.');

CkCharset_Dispose(charset);

end;