Delphi txt编码互转 ANSI Utf-8

uses System.IOUtils;

procedure ConvertFileEncoding(const SourceFileName: String; const SourceEncoding: TEncoding;
  const TargetFileName: String; TargetEncoding: TEncoding);
begin
  TFile.WriteAllText(
    TargetFileName,
    TFile.ReadAllText(SourceFileName, SourceEncoding),
    TargetEncoding);
end;



procedure TForm1.Button1Click(Sender: TObject);
var
  txtANSI: TEncoding;
  Utf8: TEncoding;
begin
  txtANSI := TEncoding.GetEncoding(54936);
  Utf8 := TEncoding.UTF8;
  ConvertFileEncoding('123.txt', txtANSI, '456.txt', Utf8);

end;

procedure TForm1.Button2Click(Sender: TObject);
var
  txtANSI: TEncoding;
  Utf8: TEncoding;
  GB2312: TEncoding;
begin
  txtANSI := TEncoding.GetEncoding(65001);
  Utf8 := TEncoding.UTF8;
  GB2312 := TEncoding.ANSI;
  ConvertFileEncoding('456.txt', txtANSI, '123.txt', GB2312);
end;