开发学院WEB开发ASP ASP中取得图片宽度和高度的类(无组件) 阅读

ASP中取得图片宽度和高度的类(无组件)

 2005-01-18 10:29:56 来源:WEB开发网   
核心提示:<%Class ImgWHInfo '获取图片宽度和高度的类,支持JPG,ASP中取得图片宽度和高度的类(无组件),GIF,PNG

<%
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)
%>

Tags:ASP 取得 图片

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