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      • asp.net教程之用ASP取出HTML里面的圖片地址的函數

      • 2017-06-11 20:19 來源:未知
      用ASP取出HTML里面的圖片地址的函數主要原理就是用正則判斷的屬性。這在采集程序中將非常有用。

        函數如下:

      以下是引用片段:
      Function ShowPic(str)  
        Set objRegExp = New Regexp'設置配置對象   
        objRegExp.IgnoreCase = True'忽略大小寫   
        objRegExp.Global = True'設置為全文搜索   
        objRegExp.Pattern = "<img.+?>"  
        '為了確保能準確地取出圖片地址所以分為兩層配置:首先找到里面的<img>標簽,然后再取出里面的圖片地址后面的getimgs函數就是實現后一個功能的。   
      strs=trim(str)   
      Set Matches =objRegExp.Execute(strs)'開始執行配置   
      For Each Match in Matches   
      RetStr = RetStr &getimgs( Match.Value )'執行第二輪的匹配   
      Next   
      ShowPic = RetStr  
      End Function  
      Function getimgs(str)   
      getimgs=""   
      Set objRegExp1 = New Regexp   
      objRegExp1.IgnoreCase = True   
      objRegExp1.Global = True   
      objRegExp1.Pattern = "http://.+?"""'取出里面的地址   
      set mm=objRegExp1.Execute(str)   
      For Each Match1 in mm   
      getimgs=getimgs&left(Match1.Value,len(Match1.Value)-1)&"||"'把里面的地址串起來備用   
      next   
      End Function   
      '取得圖片內容  
      function getHTTPPage(url)   
      on error resume next   
      dim http   
      set http=server.createobject("MSXML2.XMLHTTP")'使用xmlhttp的方法來獲得圖片的內容   
      Http.open "GET",url,false   
      Http.send()   
      if Http.readystate<>4 then   
      exit function   
      end if   
      getHTTPPage=Http.responseBody   
      set http=nothing   
      if err.number<>0 then err.Clear   
      end function   
      '保存圖片  
      function saveimage(from,tofile)   
      dim geturl,objStream,imgs   
      geturl=trim(from)   
      imgs=gethttppage(geturl)'取得圖片的具休內容的過程   
      Set objStream = Server.CreateObject("ADODB.Stream")'建立ADODB.Stream對象,必須要ADO 2.5以上版本   
      objStream.Type =1'以二進制模式打開   
      objStream.Open   
      objstream.write imgs'將字符串內容寫入緩沖   
      objstream.SaveToFile server.mappath(tofile),2'-將緩沖的內容寫入文件   
      objstream.Close()'關閉對象   
      set objstream=nothing   
      end function   
      '調用實例  
      Dim strpic,i,fname  
      strpic = ShowPic("<DIV align=center><IMG src=""圖片地址"" border=0></DIV>")  
      strpic = Split(strpic,"||")  
      If UBound(strpic) > 0 Then   
      For i = 0 To UBound(strpic) - 1  
      '保存圖片  
      fname=cstr(i&mid(strpic(i),instrrev(strpic(i),".")))   
      saveimage(strpic(i),fname)  
      Next  
      Else  
      End If  
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