如何写ASP代码检验验证码？

Question

用户注册的时候要求输入随机显示的验证码，这些该怎么用ASP来写？

Answer 1

新建个Code.asp，内容为 <% Option Explicit Response.buffer=true NumCode Function NumCode() Response.Expires = -1 Response.AddHeader "Pragma"�6�5"no-cache" Response.AddHeader "cache-ctrol"�6�5"no-cache" dim zNum�6�5i�6�5j dim Ados�6�5Ados1 Randomize timer zNum = cint(8999*Rnd+1000) Session("GetCode") = zNum dim zimg(4)�6�5NStr NStr=cstr(zNum) For i=0 to 3 zimg(i)=cint(mid(NStr�6�5i+1�6�51)) Next dim Pos set Ados=Server.CreateObject("Adodb.Stream") Ados.Mode=3 Ados.Type=1 Ados.Open set Ados1=Server.CreateObject("Adodb.Stream") Ados1.Mode=3 Ados1.Type=1 Ados1.Open Ados.LoadFromFile(Server.mappath("images/body.Fix")) Ados1.write Ados.read(1280) for i=0 to 3 Ados.Position=(9-zimg(i))*320 Ados1.Position=i*320 Ados1.write ados.read(320) next Ados.LoadFromFile(Server.mappath("images/head.fix")) Pos=lenb(Ados.read()) Ados.Position=Pos for i=0 to 9 step 1 for j=0 to 3 Ados1.Position=i*32+j*320 Ados.Position=Pos+30*j+i*120 Ados.write ados1.read(30) next next Response.ContentType = "image/BMP" Ados.Position=0 Response.BinaryWrite Ados.read() Ados.Close:set Ados=nothing Ados1.Close:set Ados1=nothing End Function %> 再需要输出验证码的地方写 <img src=Code.asp>