[[seoane]]

Código Delphi [-]
uses Wininet;

function Bajar(Url: string; Archivo: string): Boolean;
var
  hFile: THandle;
  hNet: HINTERNET;
  hUrl: HINTERNET;
  Buffer: array[0..10240] of Char;
  BytesRead: DWORD;
  BytesWritten: DWORD;
begin
  Result := FALSE;
  hFile := CreateFile(PChar(Archivo), GENERIC_WRITE, 0, nil, CREATE_ALWAYS,
    FILE_ATTRIBUTE_NORMAL, 0);
  if (hFile <> INVALID_HANDLE_VALUE) then
  begin
    hNet := InternetOpen('agent', INTERNET_OPEN_TYPE_PRECONFIG, nil, nil, 0);
    if (hNet <> nil) then
    begin
      hUrl := InternetOpenUrl(hNet, PChar(Url), nil, 0,
        INTERNET_FLAG_RELOAD, 0);
      if (hUrl <> nil) then
      begin
        while (InternetReadFile(hUrl, @Buffer, sizeof(Buffer), BytesRead)) do
        begin
          // Añadir la siguiente liena si es necesario
          // Application.ProcessMessages;
          if (BytesRead = 0) then
          begin
            Result := TRUE;
            break;
          end;
          if (not WriteFile(hFile, Buffer, BytesRead, BytesWritten, nil)) then
            break;
          if (BytesRead <> BytesWritten) then
            break;
        end;
        InternetCloseHandle(hUrl);
      end;
      InternetCloseHandle(hNet);
    end;
    CloseHandle(hFile);
  end;
end;

Ejemplo de uso:

Código Delphi [-]
  Bajar('http://www.google.com/intl/es_ALL/images/logo.gif','d:\google.gif');
  Bajar('ftp://ftp.opera.com/pub/opera/win/lng/754/es-ES/ow754_3865es-ES.lng','d:\1.lng');