ASP 实现图片等比例缩放 函数 imgInfo

'==========================
'Define Class imgInfo
'==========================
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
'========================
'end of class
'========================

sub ArticleContent(intTitleLen)
      dim i,strTemp,w,f 'add w.h
      i=0
set    pp=new    imgInfo    'add get pic 's width and length
do while not rsArticle.eof
    strTemp=""  
    strTemp= strTemp & "<table width=100% border=0 cellspacing=3 cellpadding=0>"
                  strTemp= strTemp & "<tr>"
          dim i1
         for i1=1 to 4
                   strTemp= strTemp & "<td width=25% valign=bottom><table width=100% border=0 cellspacing=0 cellpadding=0>"
                   strTemp= strTemp & "<tr>"
      
          strTemp= strTemp & "<td><div align=center><a href=ProductShow.asp?ArticleID=" & rsArticle("articleid") & ">"
    
      fileExt=lcase(getFileExtName(rsArticle("DefaultPicUrl")))
      if fileext="jpg" or fileext="bmp" or fileext="png" or fileext="gif" then
          
       w = 125 /(pp.imgW(server.mappath(rsArticle("DefaultPicUrl"))))     图片的高宽比
       f = (pp.imgH(server.mappath(rsArticle("DefaultPicUrl")))) * w         得到高度
     
     
                   strTemp= strTemp & "<img border=0 src=" & rsArticle("DefaultPicUrl") & " alt="&rsArticle("bigclassname")&"&#10"&rsArticle("title")&" height="& f &" width=125 >"
      else
       if fileext="swf" then
          strTemp= strTemp & "<object    classid='clsid:D27CDB6E-AE6D-11cf-96B8-444553540000'    codebase='http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=5,0,0,0' width='105' height='84'>"
       strTemp= strTemp &"<param name=movie value='"&rsArticle("DefaultPicUrl")&"'>"
       strTemp= strTemp &"<param name=quality value=high>"
       strTemp= strTemp &"<param name='Play' value='-1'>"
       strTemp= strTemp &"<param name='Loop' value='0'>"
       strTemp= strTemp &"<param name='Menu' value='-1'>"
       strTemp= strTemp &"<param name='wmode' value='transparent'>"
       strTemp= strTemp &"<embed src='"&rsArticle("DefaultPicUrl")&"' width='105' height='84' pluginspage='http://www.macromedia.com/shockwave/download/index.cgi?P1_Prod_Version=ShockwaveFlash' type='application/x-shockwave-flash'></embed> </object>"            
        end if
          end if    
     
                   strTemp= strTemp & "</a></div></td>"
       

                     strTemp= strTemp & "<tr>"
      
              
                   strTemp= strTemp & "<td align=center>"
                   strTemp= strTemp & "<a href=ProductShow.asp?ArticleID=" & rsArticle("articleid") & ">" & rsArticle("Title") & ""
                   strTemp= strTemp & "</a></td>"
          strTemp= strTemp & "</tr>"
                   strTemp= strTemp & "</table>"
                   strTemp= strTemp & "</td>"

                rsArticle.movenext
          if rsArticle.eof then
           strTemp= strTemp & "</tr></table>"  
           response.write strTemp
     exit do
          end if
         next

         rsArticle.moveprevious

         strTemp= strTemp & "</tr></table>"  
         response.write strTemp
         rsArticle.movenext
         i=i+1
         if i>=(MaxPerPage/4) then exit do
loop
end sub