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查看效果:asp生成图片验证码

调用代码和刷新验证码代码

<a href="javascript:f()"><img src="yzm.asp" name="yzm" id="yzm" alt="点击更换"></a>

<script>

function f()

{document.getElementById("yzm").src="yzm.asp";}

</script>

图片验证码代码:

<%

Option Explicit

Response.Expires = 0

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

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

Response.ContentType = "Image/BMP"

Randomize Timer

Dim Text_Data(9),Text_Len,Int_Temp(),I,j,k,Int_Temp2

''***** 参数配置区 *****

Text_Len = 4 ''验证码长度(支持1-25位)

''**********************

ReDim Int_Temp( Text_Len - 1 )

Text_Data(0) = "00000000000001111000001100110000110111000011011100001100110000111011000011101100001100110000011110000000000000"

Text_Data(1) = "00000000000000011000000011100000111110000000011000000001100000000110000000011000000001100000000110000000000000"

Text_Data(2) = "00000000000001111000001100110000110011000000001100000001100000001100000001100000001100000000111111000000000000"

Text_Data(3) = "00000000000001111000001100110000110011000000001100000011100000000011000011001100001100110000011110000000000000"

Text_Data(4) = "00000000000001100000000110000000011011000001101100000110110000110011000011111110000000110000000011000000000000"

Text_Data(5) = "00000000000011111100001100000000110000000011000000001111100000000011000000001100000001100000111100000000000000"

Text_Data(6) = "00000000000000111000000011000000011000000011111000001100110000110011000011001100001100110000011110000000000000"

Text_Data(7) = "00000000000011111100000000110000000110000000011000000011000000001100000001100000000110000000011000000000000000"

Text_Data(8) = "00000000000001111000001100110000110011000011101100000111100000110111000011001100001100110000011110000000000000"

Text_Data(9) = "00000000000001111000001100110000110011000011001100001100110000011111000000011000000011000000011100000000000000"

''下面随机生成各位验证码

Session("Num") = ""

For I = 0 To Text_Len - 1

Int_Temp(I) = Int(Rnd * 10)

Session("Num") = Session("Num") + Mid("0123456789",Int_Temp(I)+1,1)

Next

''下面输出文件头部分

Int_Temp2 = (Text_Len - 1) \ 4 * 220 + ((Text_Len - 1) / 4 - (Text_Len - 1) \ 4 * 4) * 44

Response.BinaryWrite ChrB(&H42) & ChrB(&H4D)

Response.BinaryWrite ChrB(((Int_Temp2 + 206) / 256 - (Int_Temp2 + 206) \ 256) * 256) & ChrB((Int_Temp2 + 206) \ 256) ''特殊位

Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H76) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H28) & ChrB(0) & ChrB(0) & ChrB(0)

Response.BinaryWrite ChrB(Text_Len * 10) ''特殊位

Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HB) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H1) & ChrB(0) & ChrB(&H4) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)

Response.BinaryWrite ChrB(((Int_Temp2 + 88) / 256 - (Int_Temp2 + 88) \ 256) * 256) & ChrB((Int_Temp2 + 88) \ 256) ''特殊位

Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(16) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(16) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(&H80) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(0) & ChrB(&H80) & ChrB(0)

Response.BinaryWrite ChrB(&H80) & ChrB(&H80) & ChrB(0) & ChrB(0) & ChrB(&H80) & ChrB(&H80) & ChrB(&H80) & ChrB(0) & ChrB(&HC0) & ChrB(&HC0) & ChrB(&HC0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(&HFF) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(&HFF) & ChrB(0) & ChrB(&HFF) & ChrB(&HFF) & ChrB(0) & ChrB(0) & ChrB(&HFF) & ChrB(&HFF) & ChrB(&HFF) & ChrB(0)

''下面输出图片数据

For i = 10 to 0 Step -1

For j = 0 to Text_Len - 1

For k = 1 to 9 Step 2

If Mid(Text_Data(Int_Temp(j)) , i * 10 + k , 1) = "0" Then Int_Temp2 = Get_BackColor() * 16 Else Int_Temp2 = Get_ForeColor() * 16

If Mid(Text_Data(Int_Temp(j)) , i * 10 + k + 1 , 1) = "0" Then Int_Temp2 = Int_Temp2 + Get_BackColor() Else Int_Temp2 = Int_Temp2 + Get_ForeColor()

Response.BinaryWrite ChrB(Int_Temp2)

Next

Next

Int_Temp2 = (Text_Len / 4 - Text_Len \ 4) * 4

Select Case Int_Temp2

Case 1

Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0)

Case 2

Response.BinaryWrite ChrB(0) & ChrB(0)

Case 3

Response.BinaryWrite ChrB(0)

End Select

Next

Function Get_BackColor()

''得到一个背景色

If Int(Rnd * 30) = 0 Then ''注：此处的 Rnd * 30 是决定背景杂色的多少，值越大，则杂色越少，图片越容易看清楚

Get_BackColor = CInt(Mid("00021209",Int(Rnd * 4) * 2 + 1,2))

Else

Get_BackColor = CInt(Mid("081515151515",Int(Rnd * 6) * 2 + 1,2))

End If

End Function

Function Get_ForeColor()

''得到一个前景色

Get_ForeColor = CInt(Mid("00021209",Int(Rnd * 4) * 2 + 1,2))

End Function

%>

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