[摘要]为了保护音乐者的版权，在MP3文件中有一段特意存储版权说明的信息，众多的MP3播放器软件都提供了修改和读取MP3文件中隐藏信息的功能，那么这些信息到底存储在哪里呢？如何得到这些信息呢？本文将为大家提供得到MP3信息的模块。 首先，定义一个公共类型Mp3tag如下： Public Typ...
为了保护音乐者的版权，在MP3文件中有一段特意存储版权说明的信息，众多的MP3播放器软件都提供了修改和读取MP3文件中隐藏信息的功能，那么这些信息到底存储在哪里呢？如何得到这些信息呢？本文将为大家提供得到MP3信息的模块。
首先，定义一个公共类型Mp3tag如下：
Public Type Mp3tag
Artist As String ’Artist 存储歌手信息
Album As String ’Album 存储唱片专辑信息
Title As String ’Title 存储标题信息
Year As String ’Year 存储年代信息
Comments As String ’Comments 存储备注信息
Genre As Integer ’Genre 存储音乐风格序列
End Type
然后，定义一个获取MP3信息的函数，它将返回这些信息，代码如下：
Public Function GetMp3Tag(FName As String) As Mp3tag
Dim Artist As String
Dim Album As String
Dim Title As String
Dim Year As String
Dim Comments As String
Dim Genre As Integer
If FName = "" Then Exit Function
If Dir(FName) = "" Then Exit Function
Dim FileNum As Integer
FileNum = FreeFile ’得到一个自由的文件号
Dim strInput As String
Open FName For Binary Access Read As FileNum ’以二进制形式打开文件
If LOF(FileNum) < 128 Then
Close FileNum
Exit Function
End If
Seek FileNum, LOF(FileNum) - 127 ’把文件指针移动到MP3信息处
strInput = Space(3)
Get FileNum, , strInput
If strInput <> "TAG" Then ’如果没有发现信息标识，就关闭文件
Close FileNum
GoTo Done:
End If
strInput = Space(30)
Get FileNum, , strInput
Title = Trim(strInput)
strInput = Space(30)
Get FileNum, , strInput
Artist = Trim(strInput)
strInput = Space(30)
Get FileNum, , strInput
Album = Trim(strInput)
strInput = Space(4)
Get FileNum, , strInput
Year = Trim(strInput)
strInput = Space(30)
Get FileNum, , strInput
Comments = Trim(strInput)
strInput = Space(1)
Get FileNum, , strInput
Genre = Asc(strInput)
Done:
GetMp3Tag.Title = Title
GetMp3Tag.Artist = Artist
GetMp3Tag.Album = Album
GetMp3Tag.Year = Year
GetMp3Tag.Year = Comments
If Genre < 0 Or Genre > 254 Then Genre = 12
GetMp3Tag.Genre = CInt(Genre)
Close FileNum
End Function
注意：MP3文件对音乐的风格进行了限制，共254种。Genre返回的只是MP3风格的序列号，具体还需要定位，在这里我把所有类型以常数形式列出，每个类型之间用" "号隔开。
Private Const sGenreMatrix = "Blues Classic Rock Country Dance Disco Funk Grunge " + _
"Hip-Hop Jazz Metal New Age Oldies Other Pop R&B Rap Reggae Rock Techno " + _
"Industrial Alternative Ska Death Metal Pranks Soundtrack Euro-Techno " + _
"Ambient Trip Hop Vocal Jazz+Funk Fusion Trance Classical Instrumental Acid " + _
"House Game Sound Clip Gospel Noise Alt. Rock Bass Soul Punk Space Meditative " + _
"Instrumental Pop Instrumental Rock Ethnic Gothic Darkwave Techno-Industrial Electronic " + _
"Pop-Folk Eurodance Dream Southern Rock Comedy Cult Gangsta Rap Top 40 Christian Rap " + _
"Pop/Punk Jungle Native American Cabaret New Wave Phychedelic Rave Showtunes Trailer " + _
"Lo-Fi Tribal Acid Punk Acid Jazz Polka Retro Musical Rock & Roll Hard Rock Folk " + _
"Folk/Rock National Folk Swing Fast-Fusion Bebob Latin Revival Celtic Blue Grass " + _
"Avantegarde Gothic Rock Progressive Rock Psychedelic Rock Symphonic Rock Slow Rock " + _
"Big Band Chorus Easy Listening Acoustic Humour Speech Chanson Opera Chamber Music " + _
"Sonata Symphony Booty Bass Primus Porn Groove Satire Slow Jam Club Tango Samba Folklore " + _
"Ballad power Ballad Rhythmic Soul Freestyle Duet Punk Rock Drum Solo A Capella Euro-House " + _
"Dance Hall Goa Drum & Bass Club-House Hardcore Terror indie Brit Pop Negerpunk Polsk Punk " + _
"Beat Christian Gangsta Rap Heavy Metal Black Metal Crossover Comteporary Christian " + _
"Christian Rock Merengue Salsa Trash Metal Anime JPop Synth Pop"
把以上代码写到一个模块中（.Bas），然后在窗体上加入5个TextBox和1个ComboBox控件，其中5个TextBox控件分别用来显示一首Mp3文件的以下信息：歌手、年代、唱片、评论、标题，ComboBox控件用来显示歌曲的风格。再放一个Command控件，其标题为“显示信息”，在它的Click事件中加入以下代码：
Private sub Command1_click()
Dim mp3Tag as Mp3tag
mp3tag = GetMp3Tag ("c:\Song.mp3")
Text1.Text = mp3tag.Artist
Text2.Text = mp3tag.Album
Text3.Text = mp3tag.Title
Text4.Text = mp3tag.Year
Text5.Text = mp3tag.Comments
Combo1.ListIndex = mp3tag.Genre
End Sub
在窗体的加载过程中加入如下代码：
Private Sub Form_Load()
Dim i As Integer,GenreArray() As String
GenreArray = Split(sGenreMatrix, " ")
For i = LBound(GenreArray) To UBound(GenreArray)
Combo1.AddItem GenreArray(i)
Next i
End Sub
以上代码在VB6 \Win2000中测试通过。
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