【www.gdgbn.com--php常用代码】

asp教程 生成验证码实例代码

call com_creatvalidcode("validcode")
sub com_creatvalidcode(ps教程n)
    " 禁止缓存
  response.expires = -1
  response.expiresabsolute = now() - 1 
  response.cachecontrol = "no-cache"
     "response.expires = -9999
     "response.addheader "pragma","no-cache"
    " response.addheader "cache-ctrol","no-cache"
     response.contenttype = "image/bmp"
     randomize
     dim i, ii, iii
     const codds = 0 " 杂点出现的机率
     const camount = 9 " 文字数量,34是数字加英文
     const ccode = "123456789abcdefghijklmnpqrstuvwxyz"
  "const ccode = "123456789abcdefghijklmnopqrstuvwxyz"
     " 颜色的数据(字符，背景)
     dim vcolordata(1)
     "vcolordata(0) = chrb(255) & chrb(0) & chrb(0)  " 蓝0，绿0，红0（黑色）
     "vcolordata(1) = chrb(211) & chrb(255) & chrb(255) " 蓝250，绿236，红211（浅蓝色）
     vcolordata(0) = chrb(51) & chrb(51) & chrb(51)  " 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）
     " 随机产生字符
     dim vcode(4), vcodes
     for i = 0 to 3
           vcode(i) = int(rnd * camount)
           vcodes = vcodes & mid(ccode, vcode(i) + 1, 1)
     next
     " 字符的数据
     dim vnumberdata(33)
     "0 vnumberdata(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111"
     vnumberdata(0) = "1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111"
     vnumberdata(1) = "1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011"
     vnumberdata(2) = "1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111"
     vnumberdata(3) = "1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011"
     vnumberdata(4) = "1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111"
     vnumberdata(5) = "1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111"
     vnumberdata(6) = "1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111"
     vnumberdata(7) = "1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111"
     vnumberdata(8) = "1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111"
     vnumberdata(9) = "1111011111111101111111101011111110101111111010111111101011111100000111110111011111011101111000100011"
     vnumberdata(10) = "1000000111110111101111011110111101110111110000111111011101111101111011110111101111011110111000000111"
     vnumberdata(11) = "1110000011110111101110111110111011111111101111111110111111111011111111101111101111011101111110001111"
     vnumberdata(12) = "1000001111110111011111011110111101111011110111101111011110111101111011110111101111011101111000001111"
     vnumberdata(13) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011110111000000111"
     vnumberdata(14) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011111111000111111"
     vnumberdata(15) = "1110000111110111011110111101111011111111101111111110111111111011100011101111011111011101111110001111"
     vnumberdata(16) = "1000100011110111011111011101111101110111110000011111011101111101110111110111011111011101111000100011"
     vnumberdata(17) = "1100000111111101111111110111111111011111111101111111110111111111011111111101111111110111111100000111"
     vnumberdata(18) = "1110000011111110111111111011111111101111111110111111111011111111101111111110111110111011111000011111"
     vnumberdata(19) = "1000100011110111011111011011111101011111110001111111010111111101101111110110111111011101111000100011"
     vnumberdata(20) = "1000111111110111111111011111111101111111110111111111011111111101111111110111111111011110111000000011"
     vnumberdata(21) = "1000100011110010011111001001111100100111110101011111010101111101010111110101011111010101111001010011"
     vnumberdata(22) = "1000100011110011011111001101111101010111110101011111010101111101100111110110011111011001111000110111"
     "o vnumberdata(24) = "1110001111110111011110111110111011111011101111101110111110111011111011101111101111011101111110001111"
     vnumberdata(23) = "1000000111110111101111011110111101111011110000011111011111111101111111110111111111011111111000111111"
     vnumberdata(24) = "1110001111110111011110111110111011111011101111101110111110111011111011101001101111011001111110001011"
     vnumberdata(25) = "1000001111110111011111011101111101110111110000111111010111111101101111110110111111011101111000110011"
     vnumberdata(26) = "1110000011110111101111011110111101111111111001111111111001111111111011110111101111011110111100000111"
     vnumberdata(27) = "1000000011101101101111110111111111011111111101111111110111111111011111111101111111110111111110001111"
     vnumberdata(28) = "1000100011110111011111011101111101110111110111011111011101111101110111110111011111011101111110001111"
     vnumberdata(29) = "1000100011110111011111011101111101110111111010111111101011111110101111111010111111110111111111011111"
     vnumberdata(30) = "1001010011110101011111010101111101010111110101011111001001111110101111111010111111101011111110101111"
     vnumberdata(31) = "1000100011110111011111101011111110101111111101111111110111111110101111111010111111011101111000100011"
     vnumberdata(32) = "1000100011110111011111011101111110101111111010111111110111111111011111111101111111110111111110001111"
     vnumberdata(33) = "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 * 999 + 1 < codds then " 随机生成杂点,数字越大,数量越小
                             response.binarywrite vcolordata(0)
                       else
                             response.binarywrite vcolordata(mid(vnumberdata(vcode(ii)), i * 10 + iii, 1))
                       end if
                 next
           next
     next
     session(psn) = vcodes  "记录入session
end sub

本文来源：http://www.gdgbn.com/jiaocheng/29726/