ASP常见问题及解答(6)

1.防止用户直接访问页面（防止自制表单提交，直接通过链接访问）
function checkPrePage()
url=request.ServerVariables("HTTP_REFERER")
url=trim(replace(url,"http://",""))
url=trim(left(url,len(request.ServerVariables("SERVER_NAME"))))
if url<>trim(request.ServerVariables("server_name")) then
response.Write("请通过正当的方法访问本网站")
response.End()
end if
end function
2.通过一下的两个函数可以实现图片，文字的同时提交处理。
Function BinaryToString(str)
strto = ""
for i=1 to lenb(str)
if AscB(MidB(str, i, 1)) > 127 then
strto = strto & chr(Ascb(MidB(str, i, 1))*256+Ascb(MidB(str, i+1, 1)))
i = i + 1
else
strto = strto & Chr(AscB(MidB(str, i, 1)))
end if
next
BinaryToString=strto
End Function
function gainformdata(n)
dim formsize,formdata,divider,datastart,dataend
redim mydata(n-1)
formsize = Request.TotalBytes
formdata = Request.BinaryRead(formsize)
for i=1 to n
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-2
mydata(i-1) = midB(formdata,datastart,dataend)
formdata=rightB(formdata,clng(formsize-instrB(datastart+1,formdata,divider))+1)
formsize=lenB(formdata)
next
gainformdata=mydata
end function
Demo：
a.htm：
<form name="form1" method="post" action="b.asp" enctype="multipart/form-data">
<textarea name="txt"></textarea>
<input type="file" name="file">
<input type="submit" name="Submit" value="提交">
</form>
b.asp:
'链接数据库
data=gainfromdata(2)

补充：asp教程,技巧与性能优化