VFP 愛用者社區

[lcm]

請問各位大大，是否有人會讀取mp3 的id3 tag，謝謝。

[garfield]

這是VB語法, 請自己試著改成vfp
Deciphering MP3 Tag information with Visual Basic
The Windows Media Player provides an easy, quick way to drop MP3 capability into a Visual Basic application. However, once you have an MP3, you may have wondered how to read information about the song, such as the song title and artist's name. If the MP3 file uses the most popular tag encryption, ID3, then you're in luck. This standard stores the Tag information in the last 128 bytes of the file (Tag:3, Title:30, Artist:30, Album:30, Year:4, Comment:30, Genre:1)
To read this information, first open the MP3 file and grab the last 128 bytes. With ID3, the first three slots hold the string TAG if the file actually contains information. If the file does contain Tag information, store the last 128 bytes in a custom variable. After that, cycle through the MP3 file, extracting information as you go. The following procedure shows the code that extracts this information as well as creates several important variables to use later on:

Option Explicit
Private Type TagInfo
Tag As String * 3
Songname As String * 30
artist As String * 30
album As String * 30
year As String * 4
comment As String * 30
genre As String * 1
End Type

Dim FileName As String
Dim CurrentTag As TagInfo

Private Sub Form1_Load()
Dim temp As String
On Error Resume Next

FileName = App.Path & "\myMP3.mp3"
Open FileName For Binary As #1
With CurrentTag
Get #1, FileLen(FileName) - 127, .Tag
If Not .Tag = "TAG" Then
label8.Caption = "No tag"
Close #1
Exit Sub
End If
Get #1, , .Songname
Get #1, , .artist
Get #1, , .album
Get #1, , .year
Get #1, , .comment
Get #1, , .genre
Close #1

txtTitle = RTrim(.Songname)
txtArtist = RTrim(.artist)
txtAlbum = RTrim(.album)
txtYear = RTrim(.year)
txtComment = RTrim(.comment)

Temp = RTrim(.genre)
txtGenreCode = Asc(Temp)
Combo1.ListIndex = CInt(txtGenreCode) - 1
End With
End Sub

Notice that the code has to handle the genre character a little differently. That's because ID3 stores this data as a single ASCII character. To match up the actual number with its corresponding description--say contained in a combobox--the procedure converts the ASCII to a number, and then looks up that number in thecombobox.

[lcm]

謝謝，garfield 大大，我已將修改成下列程式。

procedure GetMp3Id3Tag
PARAMETERS mp3filename
fd=FOPEN(mp3Filename)
FSEEK(fd,-128, 2)
cString = FREAD(fd, 128)
FCLOSE(fd)
mp3Tag=SUBSTR(cString,1,3)
mp3title=SUBSTR(cString,4,30)
mp3artist=SUBSTR(cString,34,30)
mp3album=SUBSTR(cString,64,30 )
mp3year=SUBSTR(cString,94,4)
mp3comment =SUBSTR(cString,98,30)
mp3genre=SUBSTR(cString,128,1)