怎样生成带有随机杂点的ASP数字以及字母验证码

 

一般来说生成方式比较多，一般有数字字母形式、纯数字形式、纯字母形式等等，之前有朋友咨询过关于如何生产带有随机杂点的验证码？

  今天知码网就为大家分享一下，如何使用ASP的方式生产数字字母的随机杂点验证码。

<%

Option Explicit

Response.Buffer = True

Response.Expires = -1

session.TimeOut=60

Call Com_CreatValidCode("Validatecode")

Sub Com_CreatValidCode(pSN)

' 禁止缓存

Response.Expires = -9999

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

Response.AddHeader "Cache-Control","no-cache"

Response.ContentType = "Image/BMP"

Randomize

Dim i, ii, iii

Const cOdds = 0 ' 杂点出现的机率

' 颜色的数据(字符，背景)

Dim vColorData(1)

vColorData(0) = ChrB(204) & ChrB(0) & ChrB(0)  ' 蓝204，绿0，红0（蓝色）

vColorData(1) = ChrB(252) & ChrB(232) & ChrB(221) ' 蓝252，绿232，红221（浅蓝色）

' 随机产生字符

Const cAmount = 36 ' 文字数量

Const cCode = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

Dim vCode(4), vCodes

For i = 0 To 3

  vCode(i) = Int(Rnd * cAmount)

  vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1)

Next

Session(pSN) = vCodes  '记录入Session

' 字符的数据

Dim vNumberData(35)

vNumberData(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111"

vNumberData(1) ="1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111"

vNumberData(2) ="1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011"

vNumberData(3) ="1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111"

vNumberData(4) ="1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011"

vNumberData(5) ="1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111"

vNumberData(6) ="1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111"

vNumberData(7) ="1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111"

vNumberData(8) ="1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111"

vNumberData(9) ="1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111"

vNumberData(10) ="1111011111111101111111101011111110101111111010111111101011111100000111110111011111011101111000100011"

vNumberData(11) = "1000000111110111101111011110111101110111110000111111011101111101111011110111101111011110111000000111"

vNumberData(12) ="1110000011110111101110111110111011111111101111111110111111111011111111101111101111011101111110001111"

vNumberData(13) = "1000001111110111011111011110111101111011110111101111011110111101111011110111101111011101111000001111"

vNumberData(14) ="1000000111110111101111011011111101101111110000111111011011111101101111110111111111011110111000000111"

vNumberData(15) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011111111000111111"

vNumberData(16) ="1110000111110111011110111101111011111111101111111110111111111011100011101111011111011101111110001111"

vNumberData(17) = "1000100011110111011111011101111101110111110000011111011101111101110111110111011111011101111000100011"

vNumberData(18) ="1100000111111101111111110111111111011111111101111111110111111111011111111101111111110111111100000111"

vNumberData(19) ="1110000011111110111111111011111111101111111110111111111011111111101111111110111110111011111000011111"

vNumberData(20) ="1000100011110111011111011011111101011111110001111111010111111101101111110110111111011101111000100011"

vNumberData(21) ="1000111111110111111111011111111101111111110111111111011111111101111111110111111111011110111000000011"

vNumberData(22) ="1000100011110010011111001001111100100111110101011111010101111101010111110101011111010101111001010011"

vNumberData(23) ="1000100011110011011111001101111101010111110101011111010101111101100111110110011111011001111000110111"

vNumberData(24) ="1110001111110111011110111110111011111011101111101110111110111011111011101111101111011101111110001111"

vNumberData(25) ="1000000111110111101111011110111101111011110000011111011111111101111111110111111111011111111000111111"

vNumberData(26) ="1110001111110111011110111110111011111011101111101110111110111011111011101001101111011001111110001011"

vNumberData(27) ="1000001111110111011111011101111101110111110000111111010111111101101111110110111111011101111000110011"

vNumberData(28) ="1110000011110111101111011110111101111111111001111111111001111111111011110111101111011110111100000111"

vNumberData(29) ="1000000011101101101111110111111111011111111101111111110111111111011111111101111111110111111110001111"

vNumberData(30) = "1000100011110111011111011101111101110111110111011111011101111101110111110111011111011101111110001111"

vNumberData(31) ="1000100011110111011111011101111101110111111010111111101011111110101111111010111111110111111111011111"

vNumberData(32) = "1001010011110101011111010101111101010111110101011111001001111110101111111010111111101011111110101111"

vNumberData(33) ="1000100011110111011111101011111110101111111101111111110111111110101111111010111111011101111000100011"

vNumberData(34) = "1000100011110111011111011101111110101111111010111111110111111111011111111101111111110111111110001111"

vNumberData(35) ="1100000011110111011111111101111111101111111110111111110111111111011111111011111111101110111100000011"

' 输出图像文件头

Response.BinaryWrite ChrB(66) & ChrB(77) & ChrB(230) & ChrB(4)& ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &_

  ChrB(0) & ChrB(0) & ChrB(54) & ChrB(0) & ChrB(0) &ChrB(0) & ChrB(40) & ChrB(0) &_

  ChrB(0) & ChrB(0) & ChrB(40) & ChrB(0) & ChrB(0) &ChrB(0) & ChrB(10) & ChrB(0) &_

  ChrB(0) & ChrB(0) & ChrB(1) & ChrB(0)

' 输出图像信息头

Response.BinaryWrite ChrB(24) & ChrB(0) & ChrB(0) & ChrB(0) &ChrB(0) & ChrB(0) & ChrB(176) & ChrB(4) &_

  ChrB(0) & ChrB(0) & ChrB(18) & ChrB(11) & ChrB(0) &ChrB(0) & ChrB(18) & ChrB(11) &_

  ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0) &ChrB(0) & ChrB(0) & ChrB(0) &_

  ChrB(0) & ChrB(0)

For i = 9 To 0 Step -1  ' 历经所有行

  For ii = 0 To 3  ' 历经所有字

   For iii = 1 To 10 ' 历经所有像素

    ' 逐行、逐字、逐像素地输出图像数据

    If Rnd * 99 + 1 < cOdds Then ' 随机生成杂点

     Response.BinaryWrite vColorData(0)

    Else

     Response.BinaryWritevColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1))

    End If

   Next

  Next

Next

End Sub

%>

  以上便是使用ASP方式生成带有随机杂点的数字字母验证码的方式。

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  通过我们可以完成数万数十万量验证码的快速识别，保证质量，提高营销速度！