<%
Call Com_CreatValidCode(Request.QueryString("tel"))

Public Sub Com_CreatValidCode(pTel)

     '----------禁止缓存
     Response.Expires = 0
     Response.AddHeader "Pragma","no-cache"
     Response.AddHeader "cache-ctrol","no-cache"
     Response.ContentType = "Image/BMP"

     Randomize

     Dim i, ii, iii ,rndColor,strLen,sql,rs

     Const cOdds = 5 '------------杂点出现的机率
     Const str="0123456789-"
     strLen = len(pTel)
     rndColor = ChrB(cint(rnd*255)) & ChrB(cint(rnd*255)) & ChrB(cint(rnd*255))

     '-----------颜色的数据(字符，背景)
     Dim vColorData(1)

     'vColorData(0) = ChrB(0) & ChrB(0) & ChrB(0)     '----蓝0，绿0，红0（黑色）
     'vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255) '----蓝250，绿236，红211（浅蓝色）

     'vColorData(0) = ChrB(197) & ChrB(106) & ChrB(49)     '---- 蓝0，绿0，红0（黑色）
     'vColorData(1) = ChrB(238) & ChrB(210) & ChrB(193) '-----蓝250，绿236，红211（浅蓝色）

     vColorData(0) = ChrB(0) & ChrB(0) & ChrB(0)     '---------蓝0，绿0，红0（黑色）
     vColorData(1) = ChrB(205) & ChrB(237) & ChrB(245) '------------蓝250，绿236，红211（浅蓝色）

     '--------------------随机产生字符
     Randomize

     Dim vCode()
     redim vCode(strLen-1)
     For i = 0 To strLen-1
         vCode(i) =instr(1,str,mid(pTel,i+1,1),1)-1
     Next

     '-----------字符的数据
     Dim vNumberData(11)

     'Verdana Font
     vNumberData(0) = "11111111111000111101110111011101110111011101110111011101110111011110001111111111"
     vNumberData(1) = "11111111111101111110011111110111111101111111011111110111111101111110001111111111"
     vNumberData(2) = "11111111111000111101110111011101111110111111011111101111110111111100000111111111"
     vNumberData(3) = "11111111111000111101110111111101111100111111110111111101110111011110001111111111"
     vNumberData(4) = "11111111111110111111001111101011111010111101101111100001111110111111100111111111"
     vNumberData(5) = "11111111110000011101111111011111110000111111110111111101110111011110001111111111"
     vNumberData(6) = "11111111111000111101101111011111110000111101110111011101110111011110001111111111"
     vNumberData(7) = "11111111110000011101101111111011111101111111011111110111111101111111011111111111"
     vNumberData(8) = "11111111111000111101110111011101111000111101110111011101110111011110001111111111"
     vNumberData(9) = "11111111111000111101110111011101110111011110000111111101111011011110000111111111"
     vNumberData(10) = "11111111111111111111111111111111111111111100000111111111111111111111111111111111"
     vNumberData(11) = "11111111111111111111111111111111111111111111111111111111111111111111111111111111"

     '-----------------输出图像文件头 <br>
     Response.BinaryWrite ChrB(66) & ChrB(77) &chrb(((strLen*8*10*3+54) mod 256)) & chrb(((strLen*8*10*3+54)\ 256)mod 256) & ChrB((((strLen*8*10*3+54)\ 256)\256)mod 256) & ChrB(((((strLen*8*10*3+54)\ 256)\256)\256)mod 256) & 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(strLen*8) & 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((strLen*8*10*3)mod 256)&ChrB(((strLen*8*10*3)\256)mod 256)&ChrB((((strLen*8*10*3)\256)\256)mod 256)&ChrB(((((strLen*8*10*3)\256)\256)\256)mod 256)&_
     ChrB(196) & ChrB(14) & ChrB(0) & ChrB(0) & ChrB(196) & ChrB(14)&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 strLen-1     '-------历经所有字
             For iii = 1 To 8 '--------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 rndColor
                Else
                     Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 8 + iii, 1))
                End If
             Next
         Next
     Next
End Sub
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