Asp：按比例缩小图片（无组件）

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按比例缩小图片（无组件）

类别：Asp 点击：0 评论：0 推荐：

<%
Class possible
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
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

Function readX(pic_path)
   Set fso1 = server.CreateObject("Scripting.FileSystemObject")
   Set f1 = fso1.GetFile(pic_path)
   ext=fso1.GetExtensionName(pic_path)
   select case ext
     case "gif","bmp","jpg","png":
    arr=getImageSize(f1.path)
    Response.Write arr(1)
     case "swf"
    arr=pp.getimagesize(f1.path)
    Response.Write arr(1)
   end select
   Set f1=nothing
   Set fso1=nothing
End Function

Function readY(pic_path)
   Set fso1 = server.CreateObject("Scripting.FileSystemObject")
   Set f1 = fso1.GetFile(pic_path)
   ext=fso1.GetExtensionName(pic_path)
   select case ext
     case "gif","bmp","jpg","png":
    arr=getImageSize(f1.path)
    Response.Write arr(2)
     case "swf"
    arr=pp.getimagesize(f1.path)
    Response.Write arr(2)
   end select
   Set f1=nothing
   Set fso1=nothing
End Function
End Class
%>

例子：

<%
set pp=new possible
pp.readX("E:\work\bg.jpg")
pp.readY("E:\work\bg.jpg")
%>

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