[转贴]取得上传图片大小

最新推荐文章于 2013-11-15 20:12:38 发布

转载最新推荐文章于 2013-11-15 20:12:38 发布 · 628 阅读

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此博客展示了一段代码，用于获取图片的宽度和高度。代码中定义了 imgInfo 类，包含多个私有函数用于二进制数据处理、数值转换等，还定义了公共函数 imgW 和 imgH 来获取图片的宽高，支持 GIF、BMP、JPG、PNG 等格式。

<%
imgpath="default_22.jpg"

set pp=new imgInfo
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

Class imgInfo
dim aso
Private Sub Class_Initialize
   set aso=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
   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
   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
   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 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(pic_path)
     Set fso1 = server.CreateObject("Scripting.FileSystemObject")
     If (fso1.FileExists(pic_path)) Then
   Set f1 = fso1.GetFile(pic_path)
   ext=fso1.GetExtensionName(pic_path)
   select case ext
    case "gif","bmp","jpg","png":
     arr=getImageSize(f1.path)
     imgW = arr(1)
   end select
   Set f1=nothing
else
      imgW = 0
End if
     Set fso1=nothing
End Function

Public Function imgH(pic_path)
     Set fso1 = server.CreateObject("Scripting.FileSystemObject")
If (fso1.FileExists(pic_path)) Then
   Set f1 = fso1.GetFile(pic_path)
   ext=fso1.GetExtensionName(pic_path)
   select case ext
    case "gif","bmp","jpg","png":
     arr=getImageSize(f1.path)
     imgH = arr(2)
   end select
   Set f1=nothing
else
imgH = 0
End if
     Set fso1=nothing
End Function
End Class