type TForm1 = class(TForm) Button1: TButton; procedure Button1Click(Sender: TObject); private { Private declarations } public { Public declarations } end; type TTextFormat=(tfAnsi,tfUnicode,tfUnicodeBigEndian,tfUtf8); const TextFormatFlag:array[tfAnsi..tfUtf8] of word=($0000,$FFFE,$FEFF,$EFBB);
var Form1: TForm1;
implementation
{$R *.dfm}
function WordLoHiExchange(w:Word):Word;register; asm XCHG AL, AH end;
{ TextFormat返回文本编码类型,sText未经处理的文本 } procedure ReadTextFile( const FileName: string; var TextFormat: TTextFormat; var sText:string); var w:Word; b:Byte; begin with TFileStream.Create(FileName,fmOpenRead or fmShareDenyNone) do try Read(w,2); w:=WordLoHiExchange(w);//因为是以Word数据类型读取,故高低字节互换 if w = TextFormatFlag[tfUnicode] then TextFormat:= tfUnicode else if w = TextFormatFlag[tfUnicodeBigEndian] then TextFormat:= tfUnicodeBigEndian else if w = TextFormatFlag[tfUtf8] then begin Read(b,1);//这里要注意一下,UFT-8必须要跳过三个字节。 TextFormat:=tfUtf8; end else begin TextFormat:=tfANSI; Position:=0; end; SetLength(sText,Size-Position); ReadBuffer(sText[1],Size-Position); finally Free; end; end;
procedure TForm1.Button1Click(Sender: TObject); var TexF:TTextFormat; TexS:string; begin ReadTextFile('1.txt',TexF,TexS); ShowMessage(TexS);