用ASP实现对MP3曲目信息的操作

作者：Hily 原始链接：http://hily.me/blog/2004/08/asp-mp3-id3/
版权声明：可以转载，转载时务必以超链接形式标明文章原始出处和作者信息及版权声明

先简单说一下MP3的ID3 标记，因为主要是操作这个玩意。

MP3最开始的时候没有我们今天看到的那样，有歌手、年代，专集等等信息。只有一些简单的参数如yes/no来表示是不是privated或者copyrighted等信息，这样对MP3的相关工作带来了很多不便，1996年的时候有个老外提出来在每个MP3后面追加一段数据，用以存放上述的那些信息，后来就发展成为id3 v1 据我所知的现在已经到1.1了，具体的还是自己去查一下吧。

用metadata来引入DLL

<!--METADATA TYPE="typelib"
      UUID="00000205-0000-0010-8000-00AA006D2EA4"
     NAME="ADODB Type Library"
-->

<%
  Function ConvertBin(Binary)
  'This function converts a binary byte into an ASCII byte.
    for i = 1 to LenB(Binary)
      strChar = chr(AscB(MidB(Binary,i,1)))
      ConvertBin = ConvertBin & strChar
    Next
  End Function

dim objStream
  dim strTag, strSongName, strArtist, strAlbum, strYear, _
      strComment, strGenre, strFile

'Specify the folder to iterate through, displaying all the MP3s
  Const folder = "C:mp3s"

'Grab the folder information

Dim objFSO, objFolder, objFile
  Set objFSO = Server.CreateObject("Scripting.FileSYstemObject")
  Set objFolder = objFSO.GetFolder(folder)

'Create the Stream object
  set objStream = Server.CreateObject("ADODB.Stream")
  objStream.Type = adTypeBinary

'Loop through the files in the folder
  For Each objFile in objFolder.Files
    'Open the stream
    objStream.Open
    objStream.LoadFromFile objFile.Path

'Read the last 128 bytes
    objStream.Position =  objStream.size - 128

'Read the ID3 v1 tag info
    strTag = ConvertBin(objStream.Read(3))
    if ucase(strTag) = "TAG" then
      strSongName = ConvertBin(objStream.Read(30))
      strArtist = ConvertBin(objStream.Read(30))
      strAlbum = ConvertBin(objStream.Read(30))
      strYear = ConvertBin(objStream.Read(4))
      strComment = ConvertBin(objStream.Read(30))
    end if

'Display the results
    response.write "<table><tr><td colspan=2><h3>" & _
                   "ID3 Tag info for:</td></tr><tr>" & _
                   "<td colspan=2>" & objFile.Name & "</td></tr>"
    response.write "<tr><td><b>Artist: </b></td>" & _
                   "<td>" & strArtist & "</td></tr>"
    response.write "<tr><td><b>Track: </b></td>" & _
                   "<td>" & strSongName  & "</td></tr>"
    response.write "<tr><td><b>Album: </b></td>" & _
                   <td>" & strAlbum & "</td></tr>"
    response.write "<tr><td><b>Year: </b></td>" & _
                   "<td>" & strYear & "</td></tr>"
    response.write "<tr><td><b>Comment: </b>" & _
                   "</td><td>" & strComment & "</td></tr>"
    response.write "</table>"

objStream.Close

Response.Write "<p><hr><p>"
  Next

Set objStream = Nothing    'Clean up...
%>
 

修改了一下：

<!--METADATA TYPE="typelib"
UUID="00000205-0000-0010-8000-00AA006D2EA4"
NAME="ADODB Type Library"
-->

<%
Response.Buffer = false
Function ConvertBin(Binary)
'This function converts a binary byte into an ASCII byte.
for i = 1 to LenB(Binary)
strChar = chr(AscB(MidB(Binary,i,1)))
ConvertBin = ConvertBin & strChar
Next
End Function

dim objStream
dim strTag, strSongName, strArtist, strAlbum, strYear, _
strComment, strGenre, strFile

'Specify the folder to iterate through, displaying all the MP3s
Const folder = "F:\MUSIC"

'Grab the folder information

Dim objFSO, objFolder, objFile
Set objFSO = Server.CreateObject("Scripting.FileSYstemObject")
Set objFolder = objFSO.GetFolder(folder)

'Create the Stream object
set objStream = Server.CreateObject("ADODB.Stream")
objStream.Type = adTypeBinary

'Loop through the files in the folder
For Each objFile in objFolder.Files
if lcase(objFSO.GetExtensionName(objFile)) = "mp3" then
Response.Write objFile.Type
'Open the stream
objStream.Open
objStream.LoadFromFile objFile.Path

'Read the last 128 bytes
objStream.Position = objStream.Size - 128

'Read the ID3 v1 tag info
strTag = ConvertBin(objStream.Read(3))
if ucase(strTag) = "TAG" then
strSongName = ConvertBin(objStream.Read(30))
strArtist = ConvertBin(objStream.Read(30))
strAlbum = ConvertBin(objStream.Read(30))
strYear = ConvertBin(objStream.Read(4))
strComment = ConvertBin(objStream.Read(30))
end if

'Display the results
response.write "<table><tr><td colspan=2><h3>" & _
"ID3 Tag info for:</td></tr><tr>" & _
"<td colspan=2>" & objFile.Name & "</td></tr>"
response.write "<tr><td><b>Artist: </b></td>" & _
"<td>" & strArtist & "</td></tr>"
response.write "<tr><td><b>Track: </b></td>" & _
"<td>" & strSongName & "</td></tr>"
response.write "<tr><td><b>Album: </b></td>" & _
"<td>" & strAlbum & "</td></tr>"
response.write "<tr><td><b>Year: </b></td>" & _
"<td>" & strYear & "</td></tr>"
response.write "<tr><td><b>Comment: </b>" & _
"</td><td>" & strComment & "</td></tr>"
response.write "</table>"

objStream.Close

Response.Write "<p><hr><p>"

end if
Next

Set objStream = Nothing 'Clean up...
%>

-- EOF --