做文件下载时如果文件过大就出错

[hansonboy]

我做了个下载文件的程序, 一般下载一些小文件都没问题, 但如果文件大过几M(我试过8M就不行了),下载下来的什么都没有了, 为什么呢?

[hansonboy]

用ＨＴＴＰ好像很多下载不了的

[hansonboy]

谢谢jspadmin，已经搞好了，　虽然不是用你的方法，但看到你段代码注释的地方说
''While Not Stream.EOS
''Response.BinaryWrite Stream.Read(1024 * 64)分64块,下载,这个去掉就可以下多大都可以,加上好像不能超过5M.
''Wend
我用这段来输出就正常了，　呵呵，　想不到吧　，　你说会出错的地方确没错，　我刚试过下载４５Ｍ的都没错了

[hansonboy]

下载下来的文件都是O字节

[KimSoft]

楼主说清楚呢？采用什么样的下载方式

[hansonboy]

function downloadFile(aFile)
aFileMap = Server.MapPath(aFile)

Response.Buffer = True
Response.Clear

Set aStream = Server.CreateObject("ADODB.Stream")
aStream.Open
aStream.Type = 1
on error resume next

Set fso = Server.CreateObject("Scripting.FileSystemObject")
if not fso.FileExists(aFileMap) then
Response.Write "错误：文件不存在！"
Response.End
end if

Set f = fso.GetFile(aFileMap)
iFileLen = f.size


aStream.LoadFromFile(aFileMap)
if err then
Response.Write "错误：" & err.Description
Response.End
end if

Response.AddHeader "Content-Disposition", "attachment; filename=" & f.name
Response.AddHeader "Content-Length", iFileLen
Response.CharSet = "UTF-8"
Response.ContentType = "application/ms-download"


Response.BinaryWrite aStream.Read
Response.Flush

aStream.Close
Set aStream = Nothing

Set f = Nothing
Set fso = Nothing
End Function

[hansonboy]

上面是下载的代码

[jspadmin]

用流的方式下载比较大的文件好象是有问题
建议用http直接下载。下面代码给你试试看，好用不好用
你只要传递这个参数FileName = Request.QueryString("FileName")进来就OK了。
路径下面你可以设置，也可以自己传进来。
<%
From_url = Cstr(Request.ServerVariables("HTTP_REFERER"))
Serv_url = Cstr(Request.ServerVariables("SERVER_NAME"))
if mid(From_url,8,len(Serv_url)) <> Serv_url then
response.write "非法链接！" '防止盗链
response.end
end if

Function GetFileName(longname)'/folder1/folder2/file.asp=>file.asp
while instr(longname,"/")
longname = right(longname,len(longname)-1)
wend
GetFileName = longname
End Function

Dim Stream
Dim Contents
Dim FileName
Dim TrueFileName
Dim FileExt
Const adTypeBinary = 1
FileName = Request.QueryString("FileName")
if FileName = "" Then
Response.Write "无效文件名！"
Response.End
End if
FileExt = Mid(FileName, InStrRev(FileName, ".") + 1)
Select Case UCase(FileExt)
Case "ASP", "ASA", "ASPX", "ASAX", "MDB"
Response.Write "非法操作！"
Response.End
End Select
Response.Clear
if lcase(right(FileName,3))="gif" or lcase(right(FileName,3))="jpg" or lcase(right(FileName,3))="png" then
Response.ContentType = "image/*" '对图像文件不出现下载对话框
else
Response.ContentType = "application/ms-download"
end if
Response.AddHeader "content-disposition", "attachment; filename=" & GetFileName(Request.QueryString("FileName"))
Set Stream = server.CreateObject("ADODB.Stream")
Stream.Type = adTypeBinary
Stream.Open
''if lcase(right(FileName,3))="rar" then '设置pdf类型文件目录
TrueFileName = "../admin/upsoft/"& FileName
''end if
Stream.LoadFromFile Server.MapPath(TrueFileName)
''While Not Stream.EOS
''Response.BinaryWrite Stream.Read(1024 * 64)分64块,下载,这个去掉就可以下多大都可以,加上好像不能超过5M.
''Wend
Stream.Close
Set Stream = Nothing
Response.Flush
Response.End
%>
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[hansonboy]

一定要用ＨＴＴＰ呀？