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ASP中取得图片宽度和高度的类（无组件）

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1^#

发表于 2009-3-16 18:06:00 | 只看该作者回帖奖励

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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=""" & ret(1) &""" height=""" & ret(2) &""""
      getimagesize=ret
End Function

Public Function imgW(IMGPath)
      Dim FSO,IMGFile,FileExt,Arr
      Set FSO = Server.CreateObject("Scripting.FileSystemObject")
      If (FSO.FileExists(IMGPath)) Then
         Set IMGFile = FSO.GetFile(IMGPath)
         FileExt=FSO.GetExtensionName(IMGPath)
         Select Case FileExt
            Case "gif","bmp","jpg","png":
            Arr=GetImageSize(IMGFile.Path)
            imgW = Arr(1)
         End Select
         Set IMGFile=Nothing
      Else
         imgW = 0
      End If
      Set FSO=Nothing
End Function

Public Function imgH(IMGPath)
      Dim FSO,IMGFile,FileExt,Arr
      Set FSO = server.CreateObject("Scripting.FileSystemObject")
      If (FSO.FileExists(IMGPath)) Then
         Set IMGFile = FSO.GetFile(IMGPath)
         FileExt=FSO.GetExtensionName(IMGPath)
         Select Case FileExt
            Case "gif","bmp","jpg","png":
            Arr=getImageSize(IMGFile.Path)
            imgH = Arr(2)
         End Select
         Set IMGFile=Nothing
      Else
         imgH = 0
      End If
      Set FSO=Nothing
End Function
End Class
IMGPath="Test.jpg"
Set PP = New ImgWHInfo
W = PP.imgW(Server.Mappath(IMGPath))
H = PP.imgH(Server.Mappath(IMGPath))
Set pp = Nothing

Response.Write("<img src='"&IMGPath&"' border=0><br>宽:"&W&";高:"&H)

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