怎样在DELPHI中取得MP3文件的TAG信息（title，artist等）。

[eltonxxx]

怎样在DELPHI中取得MP3文件的TAG信息（title，artist等）。
需要用控件实现吗？若需要，哪儿有？
多谢。

[njbudong]

ScanMP3Folder (Edit1.Text, ListBox1.Items);

procedure ScanMP3Folder (const AFolder : string; AMP3List : TStrings);
var
ds : TDirectoryScanner;
a : TAudioInfo;
Descr : string;
i : integer;
begin
ds := TDirectoryScanner.Create;
a := TAudioInfo.Create;
try
ds.Recursive := True;
ds.RegExprMask := '\.mp[23]';
ds.BuildFileList (AFolder);
for i := 0 to ds.Count - 1 do begin
a.LoadFromFile (ds.Item [i].Name);
if a.ID3.Ok
then Descr := a.ID3.Artist + ' - ' + a.ID3.Title
else Descr := ExtractFileName (ds.Item [i].Name);
Descr := Descr + Format (' (%d sec)', [a.MpegDuration div 1000]);
AMP3List.Add (Descr);
end;
finally begin
a.Free;
ds.Free;
end;
end;
end;

需要使用两个控件
http://anso.virtualave.net/delphi_stuff.htm#TAudioInfo(TAudioInfo)
http://www.delphi3000.com/article.asp?id=1083(TDirectoryScanner)

[ly_liuyang]

不用控件的：～！
unit MP_ID3_Unit;

interface

uses
Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
StdCtrls, Buttons;

type
TID3Tag = record
Tag: array[0..2] of Char;
Songname: array[0..29] of Char;
Artist: array[0..29] of Char;
Album: array[0..29] of Char;
Year: array[0..3] of Char;
Comment: array[0..29] of Char;
Genre: Byte;
end;

type
TID3Info = class(TForm)
Edit1: TEdit;
Edit2: TEdit;
Edit3: TEdit;
Edit4: TEdit;
Edit5: TEdit;
Name: TLabel;
Artist: TLabel;
Album: TLabel;
Year: TLabel;
Comment: TLabel;
Remove: TBitBtn;
Update: TBitBtn;
OK: TBitBtn;
procedure RemoveClick(Sender: TObject);
procedure UpdateClick(Sender: TObject);
procedure FormShow(Sender: TObject);
procedure OKClick(Sender: TObject);
private
{ Private declarations }
public
{ Public declarations }
function ReadID3Tag(FileName: string): TID3Tag;
function WriteID3Tag(FileName: string; ID3InfoTag: TID3Tag): Boolean;
function RemoveID3Tag(FileName: string): Boolean;
function ID3TagsAreEqual(ID3Tag1, ID3Tag2: TID3Tag): Boolean;
end;
var
ID3Info: TID3Info;
id3tag:tid3tag;

implementation

uses Mp_Unit,MP_List_Unit;

{$R *.DFM}

procedure TID3Info.RemoveClick(Sender: TObject);
begin
if list.SongListView.SelCount>0 then
if fileexists(MP3PF.ItemToFileName(list.SongListView.Selected)) then
if removeid3tag(MP3PF.ItemToFileName(list.SongListView.Selected)) then
begin
showmessage('Remove ok!');
edit1.Text:='';
edit2.Text:='';
edit3.Text:='';
edit4.Text:='';
edit5.Text:='';
end else ShowMessage('Remove fail!');
end;

function TID3Info.ID3TagsAreEqual(ID3Tag1, ID3Tag2: TID3Tag): Boolean;
begin
with ID3Tag1 do
if (string(ID3Tag2.Tag) <> string(Tag)) or
(string(ID3Tag2.Songname) <> string(SongName)) or
(string(ID3Tag2.Artist) <> string(Artist)) or
(string(ID3Tag2.Album) <> string(Album)) or
(string(ID3Tag2.Year) <> string(Year)) or
(string(ID3Tag2.Comment) <> string(Comment)) or
(ID3Tag2.Genre <> Genre) then Result := False
else Result := True;
end;

function TID3Info.ReadID3Tag(FileName: string): TID3Tag;
var
F: file;
begin
{$I-}
AssignFile(F, FileName);
Reset(F, 1);
Seek(F, Filesize(F) - SizeOf(TID3Tag));
Result.Tag[1] := 'N';
BlockRead(F, Result, SizeOf(TID3Tag));
CloseFile(F);
{$I+}
end;

function TID3Info.RemoveID3Tag(FileName: string): Boolean;
var
FileHandle: integer;
attr:Integer;
begin
{$I-}
attr:=FileGetAttr(FileName);
FileSetAttr(FileName,faArchive);
FileHandle := FileOpen(FileName, fmOpenReadWrite or fmShareDenyWrite);
if FileHandle > 0 then
if ID3Tag.Tag = 'TAG' then
begin
FileSeek(FileHandle, 0 - SizeOf(TID3Tag), 2);
SetEndOfFile(FileHandle);
end;
FileClose(FileHandle);
result := FileHandle <> 0;
FileSetAttr(FileName,attr);
{$I+}
end;

function TID3Info.WriteID3Tag(FileName: string; ID3InfoTag: TID3Tag): Boolean;
var
F: file;
X: Integer;
attr:Integer;
begin
{$I-}
attr:=FileGetAttr(FileName);
FileSetAttr(FileName,faArchive);
AssignFile(F, FileName);
Reset(F, 1);
X:=0;
if ReadID3Tag(FileName).Tag <> 'TAG' then Seek(F, FileSize(F))
else Seek(F, FileSize(F) - SizeOf(TID3Tag));
BlockWrite(F, ID3Tag, SizeOf(TID3Tag), X);
Result := (X <> 0);
CloseFile(F);
FileSetAttr(FileName,attr);
{$I+}
end;

procedure TID3Info.UpdateClick(Sender: TObject);
var
S: string;
begin
if list.SongListView.SelCount>0 then
if list.SongListView.Items[list.SongListView.Selected.index].Caption<>'' then
with ID3Tag do
begin
Tag := 'TAG';
S := edit1.text;
if length(S) > 30 then setlength(S, 30);
StrPCopy(Songname, S);
S := edit2.text;
if length(S) > 30 then setlength(S, 30);
StrPCopy(Artist, S);
S := edit3.text;
if length(S) > 30 then setlength(S, 30);
StrPCopy(Album, S);
S := edit4.text;
if length(S) > 4 then setlength(S, 4);
StrPCopy(Year, S);
S := edit5.text;
if length(S) > 30 then setlength(S, 30);
StrPCopy(Comment, S);
if WriteID3Tag(MP3PF.ItemToFileName(list.SongListView.Selected), ID3Tag)
then showmessage('Update OK!')
else begin
showmessage('Update fail!');
FormShow(nil);
end;
end;
end;

procedure TID3Info.FormShow(Sender: TObject);
begin
if list.SongListView.SelCount>0 then
if fileexists(MP3PF.ItemToFileName(list.SongListView.Selected)) then
ID3Tag:=ReadID3Tag(MP3PF.ItemToFileName(list.SongListView.Selected));
if (ID3Tag.Tag = 'TAG') and (trim(ID3Tag.songname) <> '') then
begin
//Display the Songname etc.. in the Label
edit1.Text := Trim(ID3Tag.songname);
edit2.Text := Trim(ID3Tag.Artist);
edit3.Text := Trim(ID3Tag.Album);
edit4.Text := Trim(ID3Tag.Year);
edit5.Text := Trim(ID3Tag.Comment);
end else
begin
edit1.Text := ExtractFileName(list.SongListView.Items[list.SongListView.Selected.index].Caption);
edit2.Text := '';
edit3.Text := '';
edit4.Text := '';
edit5.Text := '';
end;
end;

procedure TID3Info.OKClick(Sender: TObject);
begin
close;
end;

end.