网上有不少生成缩略图的ASP组件。若你的虚拟空间不支持注册新组件,可能会感觉自己的网站失色不少。心晴不才,结合网上资源写了个无组件生成缩略图程序,仅供参考。
还是先看看基础部分吧。首先,我们知道在页面中显示图片是如下代码:
<img src="pic.gif" border="0" width="300" height="260"> src是图片路径,border控制图片边缘宽度,width是图片的长度,height是图片的高度。缩略图的生成其实就是在原始尺寸上缩放。但一般为了尽量少失真,我们都会按比例缩放。于是,获取图片的长宽尺寸也就成了生成缩略图的重点。
下面便是编写无组件生成缩略图的步骤:
1.无组件获取图片大小
以前刚学ASP不久时看到过一篇利用ASCII码实现无组件获取图片尺寸的文章。后来试了试,发现在获取jpg类图片尺寸时总是不能正确显示,在网上查了查,居然有不少网站转载这个程序,但没有一家指出此程序的缺陷,也就更谈不上解决缺陷的办法了。后来又google了一下,终于找到了一篇介绍利用ADODB.stream获取图片尺寸的文章,按其介绍的方法,修改里面的代码试了试,效果真的还不错,现在将其拿出来与大家分享:
利用ADODB.stream获取图片尺寸的通用类
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<%
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'//////////// GPS:Get Picture Size //////////////
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'//////////////利用ADODB.stream获取图片尺寸//////////////
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'/////////Cited By Leon(心晴) 2005年8月11日//////////
5![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Class GPS
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Dim aso
8![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Private Sub Class_Initialize
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Set aso=CreateObject("Adodb.Stream")
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aso.Mode=3
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aso.Type=1
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aso.Open
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End Sub
15![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Private Sub Class_Terminate
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set aso=nothing
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End Sub
19![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Private Function Bin2Str(Bin)
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Dim I, Str
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For I=1 to LenB(Bin)
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clow=MidB(Bin,I,1)
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if AscB(clow)<128 then
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Str = Str & Chr(ASCB(clow))
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Else
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I=I+1
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if I <= LenB(Bin) then Str = Str & Chr(ASCW(MidB(Bin,I,1)&clow))
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end If
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Next
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Bin2Str = Str
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End Function
33![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Private Function Num2Str(num,base,lens)
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'GPS (2005-8-11)
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dim ret
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ret = ""
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while(num>=base)
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ret = (num mod base) & ret
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num = (num - num mod base)/base
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wend
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Num2Str = right(string(lens,"0") & num & ret,lens)
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End Function
44![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Private Function Str2Num(str,base)
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'GPS (2005-8-11)
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dim ret
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ret = 0
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for i=1 to len(str)
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ret = ret *base + cint(mid(str,i,1))
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next
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Str2Num=ret
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End Function
54![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Private Function BinVal(bin)
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'GPS (2002-8-11)
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dim ret
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ret = 0
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for i = lenb(bin) to 1 step -1
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ret = ret *256 + ascb(midb(bin,i,1))
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next
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BinVal=ret
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End Function
64![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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Private Function BinVal2(bin)
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'GPS (2002-8-11)
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dim ret
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ret = 0
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for i = 1 to lenb(bin)
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ret = ret *256 + ascb(midb(bin,i,1))
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next
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BinVal2=ret
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End Function
74![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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'///以下是调用代码///
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Function getImageSize(filespec)
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'GPS (2002-8-11)
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dim ret(3)
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aso.LoadFromFile(filespec)
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bFlag=aso.read(3)
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select case hex(binVal(bFlag))
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case "4E5089":
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aso.read(15)
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ret(0)="PNG"
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ret(1)=BinVal2(aso.read(2))
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aso.read(2)
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ret(2)=BinVal2(aso.read(2))
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case "464947":
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aso.read(3)
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ret(0)="GIF"
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ret(1)=BinVal(aso.read(2))
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ret(2)=BinVal(aso.read(2))
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case "535746":
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aso.read(5)
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binData=aso.Read(1)
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sConv=Num2Str(ascb(binData),2 ,8)
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nBits=Str2Num(left(sConv,5),2)
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sConv=mid(sConv,6)
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while(len(sConv)<nBits*4)
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binData=aso.Read(1)
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sConv=sConv&Num2Str(ascb(binData),2 ,8)
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wend
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ret(0)="SWF"
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ret(1)=int(abs(Str2Num(mid(sConv,1*nBits+1,nBits),2)-Str2Num(mid(sConv,0*nBits+1,nBits),2))/20)
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ret(2)=int(abs(Str2Num(mid(sConv,3*nBits+1,nBits),2)-Str2Num(mid(sConv,2*nBits+1,nBits),2))/20)
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case "FFD8FF":
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do
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do: p1=binVal(aso.Read(1)): loop while p1=255 and not aso.EOS
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if p1>191 and p1<196 then exit do else aso.read(binval2(aso.Read(2))-2)
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do:p1=binVal(aso.Read(1)):loop while p1<255 and not aso.EOS
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loop while true
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aso.Read(3)
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ret(0)="JPG"
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ret(2)=binval2(aso.Read(2))
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ret(1)=binval2(aso.Read(2))
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case else:
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if left(Bin2Str(bFlag),2)="BM" then
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aso.Read(15)
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ret(0)="BMP"
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ret(1)=binval(aso.Read(4))
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ret(2)=binval(aso.Read(4))
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else
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ret(0)=""
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end if
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end select
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ret(3)="width=""" & ret(1) &""" height="""
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& ret(2) &""""
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getimagesize=ret
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End Function
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End Class
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%>
132![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
将以上代码复制生成GPS.asp文件,这样无组件获取图片尺寸的通用类就OK了。![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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2.获取图片路径
由于不只一张图片,以及图片需分类存放,我们在数据库中设计了一个存放图片相对路径的字段ImgURL。我们把上传的图片都放在一个名为images的文件夹中(至于如何无组件上传图片心晴就不在多说了)。 现在我们先设计一个ShowImg.asp页面用来显示缩略图及相关信息。具体设计如下:
图片:
图片格式:
图片尺寸:
图片大小:
点击次数:
下面,我们获取图片的绝对路径。代码如下:
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<%
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'/////获取ShowImg.asp的绝对路径/////
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Dim curFile
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curFile=Server.mappath(Request.servervariables("PATH_INFO"))
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Dim curfilename,filename
6![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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'/////图片相对路径(存于数据库中)
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cufilename=rs("ImgURL")
9![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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'/////因为ShowImg.asp与images在同一目录,所以我们用instrrev获取images的路径/////
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filename=left(curFile,instrrev(curFile,"\"))&cufilename
12![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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'/////建立GPS类实体/////
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Dim GetPicSize
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Set GetPicSize=new GPS
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Set fs=Server.CreateObject("Scripting.FileSystemObject")
17![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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'/////获取图片类型/////
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Dim PicSuffixName
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PicSuffixName=fs.GetExtensionName(filename)
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Dim PD '//Picture Dimension
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Dim PWidth,PHeight
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Select Case PicSuffixName
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Case "gif","bmp","jpg","png":
25![](https://www.cnblogs.com/Images/OutliningIndicators/InBlock.gif)
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'/////调用GPS通用类中的GetImageSize函数获取图片尺寸/////
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PD=GetPicSize.GetImageSize(filename)
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PWidth=PD(1) '//获取图片宽度
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PHeight=PD(2) '//获取图片高度
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Case "swf"
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PD=GetPicSize.GetImageSize(filename)
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PWidth=PD(1) '//获取Flash宽度
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PHeight=PD(2) '//获取Flash高度
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Case Else
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End Select
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Set fs=Nothing
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Set GetPicSize=Nothing
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%>
39![](https://www.cnblogs.com/Images/OutliningIndicators/None.gif)
将上面的代码复制到<body>的上面就OK了!![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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当然,有人会说,获取路径不一定要用PATH_INFO,直接用server.mappath()不就可以了嘛,呵呵,萝卜青菜各有所爱,主要是我用PATH_INFO可以实现FSO的一些功能而用server.mappath()没有搞定,所以一直使用这个。
3.定义缩略图尺寸
这部分代码就是仁者见仁,智者见智了。首先,我们需要规定缩略图显示尺寸范围,譬如:300X260,代码可以这样写:
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<%
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Dim PXWidth,PXHeight
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Dim Pp '//Proportion
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If PWidth=0 Or PWidth="" Then
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PXWidth=0
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PXHeight=0
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Else
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Pp=FormatNumber(PWidth/PHeight,2) '//长宽比
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End If
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If PWidth>=PHeight Then
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If PWidth>=300 Then
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PXWidth=300
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PXHeight=FormatNumber(300/Pp,0)
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Else
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PXWidth=PWidth
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PXHeight=PHeight
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End If
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Else
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If PHeight>=260 Then
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PXHeight=260
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PXWidth=FormatNumber(260*Pp,0)
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Else
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PXWidth=PWidth
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PXHeight=PHeight
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End If
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End If
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%>
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将上面的代码紧接第二步写下即可。调用时代码如下:
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<img src=<%=curfilename%> border="0" width=<%=PXWidth%>
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height=<%=PXHeight%>>
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至于图片格式可以用得到,图片尺寸可以写成
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<%
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response.write PXWidth&"X"&PXHeight
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%>
图片大小可以用FSO.GetFileSize(filename)来实现,而点击次数可以简单地用SQL语句实现,具体编码就不再累述了。![](https://www.cnblogs.com/Images/OutliningIndicators/ExpandedBlockStart.gif)
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这样,一个无组件生成缩略图程序就写好了,可能有点拿来主义,不过只要大家能将方法掌握相信还是有很大提高的。