Delphi UTF8文件读写操作

function LoadUTF8File(FileName: string): string;
var
  SS: TStringStream;
begin
  SS := TStringStream.Create('', TEncoding.UTF8);
  SS.LoadFromFile(FileName);
  Result := SS.DataString;
end;
 
 
procedure SaveUTF8File(Content:string;FileName: string);
var
  SS: TStringStream;
begin
  SS := TStringStream.Create('', TEncoding.UTF8);
  SS.WriteString(Content);
  SS.SaveToFile(FileName);
  SS.Free;
end;
 

Delphi 2010 以前版本Utf-8保存文件

// UTF8 BOM
procedure SaveUTF8FileB(AContent:string;AFileName: string);
var ffileStream:TFileStream;
        futf8Bytes: string;
       S: string;
begin
       ffileStream:=TFileStream.Create(AFileName,fmCreate);
       futf8Bytes:= UTF8Encode(AContent);
       S:=#$EF#$BB#$BF;
       ffileStream.Write(S[1],Length(S));
       ffileStream.Write(futf8Bytes[1],Length(futf8Bytes));
       ffileStream.Free;
end;

// UTF8无BOM
procedure SaveUTF8File(AContent:string;AFileName: string);
var
  sFile:TFileStream;
  utf8Bytes: string;
  s: string;
begin
  sFile:=TFileStream.Create(AFileName,fmCreate);
  utf8Bytes:= UTF8Encode(AContent);
  sFile.Write(s[1],Length(s));
  sFile.Write(utf8Bytes[1],Length(utf8Bytes));
  sFile.Free;
end;