向数据库上传图片时，出现调用leftB函数出错，请问是什么问题呢？
upload.asp <!--#include file="conn.asp"--><% formsize=request.totalbytes
formdata=request.binaryread(formsize)
bncrlf=chrB(13)&chrB(10)
divider=leftB(formdata,clng(instrb(formdata,bncrlf))-1)
datastart=instrb(formdata,bncrlf&bncrlf)+4
dataend=instrb(datastart+1,formdata,divider)-datastart
mydata=midb(formdata,datastart,dataend)
set rs=server.createobject("ADODB.recordset")
rs.open "SELECT * FROM imgurl",conn,3,3
rs.addnew
rs("img").AppendChunk myData
rs.update
rs.close
set rs=nothing
set conn=nothing
response.redirect "index.asp" %>
提示无法调用函数leftb,请问错在哪里了呢?
