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Class ImgWHInfo '获取图片宽度和高度的类，支持JPG，GIF，PNG，BMP
     Dim ASO
     Private Sub Class_Initialize
         Set ASO=Server.CreateObject("ADODB.Stream")
         ASO.Mode=3
         ASO.Type=1
         ASO.Open
     End Sub
     Private Sub Class_Terminate
         Err.Clear
         Set ASO=Nothing
     End Sub 

     Private Function Bin2Str(Bin)
         Dim I, Str
         For I=1 To LenB(Bin)
             clow=MidB(Bin,I,1)
             If ASCB(clow)<128 Then
                 Str = Str & Chr(ASCB(clow))
             Else
                 I=I+1
                 If I <= LenB(Bin) Then Str = Str & Chr(ASCW(MidB(Bin,I,1)&clow))
             End If
         Next
         Bin2Str = Str
     End Function
      
     Private Function Num2Str(Num,Base,Lens)
         Dim Ret
         Ret = ""
         While(Num>=Base)
             Ret = (Num Mod Base) & Ret
             Num = (Num - Num Mod Base)/Base
         Wend
         Num2Str = Right(String(Lens,"0") & Num & Ret,Lens)
     End Function
      
     Private Function Str2Num(Str,Base) 
         Dim Ret,I
         Ret = 0 
         For I=1 To Len(Str) 
             Ret = Ret *base + Cint(Mid(Str,I,1)) 
         Next 
         Str2Num=Ret 
     End Function 
      
     Private Function BinVal(Bin) 
         Dim Ret,I
         Ret = 0 
         For I = LenB(Bin) To 1 Step -1 
             Ret = Ret *256 + AscB(MidB(Bin,I,1)) 
         Next 
         BinVal=Ret 
     End Function 
      
     Private Function BinVal2(Bin) 
         Dim Ret,I
         Ret = 0 
         For I = 1 To LenB(Bin) 
             Ret = Ret *256 + AscB(MidB(Bin,I,1)) 
         Next 
         BinVal2=Ret 
     End Function 
      
     Private Function GetImageSize(filespec)
         Dim bFlag
         Dim Ret(3) 
         ASO.LoadFromFile(filespec) 
         bFlag=ASO.Read(3) 
         Select Case Hex(binVal(bFlag)) 
         Case "4E5089": 
             ASO.Read(15) 
             ret(0)="PNG" 
             ret(1)=BinVal2(ASO.Read(2)) 
             ASO.Read(2) 
             ret(2)=BinVal2(ASO.Read(2)) 
         Case "464947": 
             ASO.read(3) 
             ret(0)="gif" 
             ret(1)=BinVal(ASO.Read(2)) 
             ret(2)=BinVal(ASO.Read(2)) 
         Case "535746": 
             ASO.read(5) 
             binData=ASO.Read(1) 
             sConv=Num2Str(ascb(binData),2 ,8) 
             nBits=Str2Num(left(sConv,5),2) 
             sConv=mid(sConv,6) 
             While(len(sConv)<nBits*4) 
                 binData=ASO.Read(1) 
                 sConv=sConv&Num2Str(AscB(binData),2 ,8) 
             Wend 
             ret(0)="SWF" 
             ret(1)=Int(Abs(Str2Num(Mid(sConv,1*nBits+1,nBits),2)-Str2Num(Mid(sConv,0*nBits+1,nBits),2))/20) 
             ret(2)=Int(Abs(Str2Num(Mid(sConv,3*nBits+1,nBits),2)-Str2Num(Mid(sConv,2*nBits+1,nBits),2))/20) 
         Case "FFD8FF": 
             Do  
             Do: p1=binVal(ASO.Read(1)): Loop While p1=255 And Not ASO.EOS 
             If p1>191 And p1<196 Then Exit Do Else ASO.read(binval2(ASO.Read(2))-2) 
             Do:p1=binVal(ASO.Read(1)):Loop While p1<255 And Not ASO.EOS 
             Loop While True 
             ASO.Read(3) 
             ret(0)="JPG" 
             ret(2)=binval2(ASO.Read(2)) 
             ret(1)=binval2(ASO.Read(2)) 
         Case Else: 
             If left(Bin2Str(bFlag),2)="BM" Then 
                 ASO.Read(15) 
                 ret(0)="BMP" 
                 ret(1)=binval(ASO.Read(4)) 
                 ret(2)=binval(ASO.Read(4)) 
             Else 
                     ret(0)="" 
             End If 
         End Select 
         ret(3)="width=""" &am