查看效果:asp生成数字图片验证码

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在这个代码中,用到了两个文件,一个是head.fix,body.Fix

调用代码:

<img src=numbercode.asp onclick="javascript:change();" alt="点击变化" id="codeimg">

<script language="javascript">

function change(){

document.getElementById("codeimg").src='numbercode.asp';

}

</script>

图片代码:

Option Explicit

Response.buffer=true

NumCode

Function NumCode()

Response.Expires = -1

Response.AddHeader "Pragma","no-cache"

Response.AddHeader "cache-ctrol","no-cache"

dim zNum,i,j

dim Ados,Ados1

Randomize timer

zNum = cint(8999*Rnd+1000)

Session("GetCode") = zNum

dim zimg(4),NStr

NStr=cstr(zNum)

For i=0 to 3

zimg(i)=cint(mid(NStr,i+1,1))

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("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("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

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