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使用Adodb.Stream下載文件(如下代碼)。

       Response.ContentType = "application/octet-stream"
       response.AddHeader "Content-Disposition","attachment;filename=" &  objRs("Attach_Name")& filetype
       Set Stream = Server.CreateObject("ADODB.Stream")

       Stream.type=1
       Stream.Open
       Stream.LoadFromFile server.mappath(objRs("Attach_path"))
       Response.BinaryWrite Stream.Read         
       Stream.Close
       Set Stream = Nothing

當下載文件小于4M時沒問題，大于4M時出錯，提示 ：

Response對象錯誤 'ASP 0251 : 80004005'     
    
超過響應緩沖區限制

問題出在IIS的配制中AspBufferingLimit只有4M，所以有如下幾種解決辦法：

1、修改IIS的配制

停止IIS服務，然后用記事本修改C:\WINDOWS\system32\inetsrv\MetaBase.xml   
  中的:   
   AspBufferingLimit="4194304"    //即默認4M   
  改為:   
   AspBufferingLimit="8388608"    //改為8M或更多，自己決定

2、如果不想修改IIS的默認配制就要修改代碼了。

     Response.Buffer=False   ‘將Response.Buffer設為否
     Response.ContentType = "application/octet-stream"
       response.AddHeader "Content-Disposition","attachment;filename=" &  objRs("Attach_Name")& filetype
       Set Stream = Server.CreateObject("ADODB.Stream")

       Stream.type=1
       Stream.Open
       Stream.LoadFromFile server.mappath(objRs("Attach_path"))
     offset = 0
     ChunkSize = 2048*1024        ‘ChunkSize小于IIS配制文件中的AspBufferingLimit項所設置的大小
     TotalSize = Stream.Size
     while offset < TotalSize
         if (TotalSize - offset < ChunkSize) then
             ChunkSize = TotalSize – offset
         end if
         strChunk = Stream.Read(ChunkSize)         
            Response.BinaryWrite strChunk       
          offset = offset + ChunkSize
     wend        
       Stream.Close

或者

Response.Buffer= true     ‘使用緩沖區
    Response.Clear                
   Response.ContentType = "application/octet-stream"
       response.AddHeader "Content-Disposition","attachment;filename=" &  objRs("Attach_Name")& filetype
       Set Stream = Server.CreateObject("ADODB.Stream")

       Stream.type=1
       Stream.Open
       Stream.LoadFromFile server.mappath(objRs("Attach_path"))
     offset = 0
     ChunkSize = 2048*1024
     TotalSize = Stream.Size
     while offset < TotalSize
         if (TotalSize - offset < ChunkSize) then
             ChunkSize = TotalSize – offset
         end if
         strChunk = Stream.Read(ChunkSize)         
            Response.BinaryWrite strChunk       
            response.flush                ‘這句很重要，它把緩沖區的數據據推出去
          offset = offset + ChunkSize
     wend        
       Stream.Close