用AnsiToUtf8这个函数就OK了,相关源码如下:
function Utf8Encode(const WS: WideString): UTF8String;
var
L: Integer;
Temp: UTF8String;
begin
Result := '';
if WS = '' then Exit;
SetLength(Temp, Length(WS) * 3); // SetLength includes space for null terminator
L := UnicodeToUtf8(PChar(Temp), Length(Temp)+1, PWideChar(WS), Length(WS));
if L > 0 then
SetLength(Temp, L-1)
else
Temp := '';
Result := Temp;
end;
function Utf8Decode(const S: UTF8String): WideString;
var
L: Integer;
Temp: WideString;
begin
Result := '';
if S = '' then Exit;
SetLength(Temp, Length(S));
L := Utf8ToUnicode(PWideChar(Temp), Length(Temp)+1, PChar(S), Length(S));
if L > 0 then
SetLength(Temp, L-1)
else
Temp := '';
Result := Temp;
end;
function AnsiToUtf8(const S: string): UTF8String;
begin
Result := Utf8Encode(S);
end;
function Utf8ToAnsi(const S: UTF8String): string;
begin
Result := Utf8Decode(S);
end;