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)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 & "

"
                  strTemp= strTemp & ""
          dim i1
         for i1=1 to 4
                   strTemp= strTemp & ""

                rsArticle.movenext
          if rsArticle.eof then
           strTemp= strTemp & "

"                    strTemp= strTemp & ""                  strTemp= strTemp & ""                              strTemp= strTemp & " "                                          strTemp= strTemp & ""           strTemp= strTemp & ""                    strTemp= strTemp & " "            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 & ""       else        if fileext="swf" then           strTemp= strTemp & ""        strTemp= strTemp &""        strTemp= strTemp &""        strTemp= strTemp &""        strTemp= strTemp &""        strTemp= strTemp &""        strTemp= strTemp &""        strTemp= strTemp &" "                     end if           end if                              strTemp= strTemp & " "                    strTemp= strTemp & "" & rsArticle("Title") & ""                    strTemp= strTemp & " "                    strTemp= strTemp & "

"  
           response.write strTemp
     exit do
          end if
         next

         rsArticle.moveprevious

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