验证码图片

最新推荐文章于 2022-05-29 22:04:23 发布

转载最新推荐文章于 2022-05-29 22:04:23 发布 · 352 阅读

文章标签：

#file #timer

ASP 专栏收录该内容

16 篇文章

订阅专栏

本文介绍了一段使用ASP编写的验证码生成脚本。该脚本通过生成随机数并将其存储在会话变量中，然后将这些数字转换为位图图像以供用户验证。文章详细解释了生成随机字符串、创建位图图像文件头及信息头的过程，并通过随机选择的颜色和线条干扰来增加验证码的复杂性。

<%Option Explicit%>   <% Response.Expires = 0 Dim numRnd,strRnd,site_verCookies numRnd = (Fix(Timer) mod 9999) * 999 strRnd = Right("000" & numRnd,4) sys.setSession SESS_VERIFY_CODE,strRnd DisplayBMP strRnd '***************************************************************** ' 验证码显示函数 '***************************************************************** Sub DisplayBMP(RndNumberStr) 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 = 8 Const cAmount = 36 Const cCode = "0123456789" Dim vColorData(1) vColorData(0) = ChrB(0) & ChrB(0) & ChrB(0) vColorData(1) = ChrB(255) & ChrB(255) & ChrB(255) Dim vCode(4) For i = 0 To 3 vCode(i) = Mid(RndNumberStr,i + 1,1) Next Dim ND(35) ND(0) = "1110000111110111101111011110111101001011110100101111010010111101001011110111101111011110111110000111" ND(1) = "1111011111110001111111110111111111011111111101111111110111111111011111111101111111110111111100000111" ND(2) = "1110000111110111101111011110111111111011111111011111111011111111011111111011111111011110111100000011" ND(3) = "1110000111110111101111011110111111110111111100111111111101111111111011110111101111011110111110000111" ND(4) = "1111101111111110111111110011111110101111110110111111011011111100000011111110111111111011111111000011" ND(5) = "1100000011110111111111011111111101000111110011101111111110111111111011110111101111011110111110000111" ND(6) = "1111000111111011101111011111111101111111110100011111001110111101111011110111101111011110111110000111" ND(7) = "1100000011110111011111011101111111101111111110111111110111111111011111111101111111110111111111011111" ND(8) = "1110000111110111101111011110111101111011111000011111101101111101111011110111101111011110111110000111" ND(9) = "1110001111110111011111011110111101111011110111001111100010111111111011111111101111011101111110001111" ND(10) = "1111011111111101111111101011111110101111111010111111101011111100000111110111011111011101111000100011" ND(11) = "1000000111110111101111011110111101110111110000111111011101111101111011110111101111011110111000000111" ND(12) = "1110000011110111101110111110111011111111101111111110111111111011111111101111101111011101111110001111" ND(13) = "1000001111110111011111011110111101111011110111101111011110111101111011110111101111011101111000001111" ND(14) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011110111000000111" ND(15) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011111111000111111" ND(16) = "1110000111110111011110111101111011111111101111111110111111111011100011101111011111011101111110001111" ND(17) = "1000100011110111011111011101111101110111110000011111011101111101110111110111011111011101111000100011" ND(18) = "1100000111111101111111110111111111011111111101111111110111111111011111111101111111110111111100000111" ND(19) = "1110000011111110111111111011111111101111111110111111111011111111101111111110111110111011111000011111" ND(20) = "1000100011110111011111011011111101011111110001111111010111111101101111110110111111011101111000100011" ND(21) = "1000111111110111111111011111111101111111110111111111011111111101111111110111111111011110111000000011" ND(22) = "1000100011110010011111001001111100100111110101011111010101111101010111110101011111010101111001010011" ND(23) = "1000100011110011011111001101111101010111110101011111010101111101100111110110011111011001111000110111" ND(24) = "1110001111110111011110111110111011111011101111101110111110111011111011101111101111011101111110001111" ND(25) = "1000000111110111101111011110111101111011110000011111011111111101111111110111111111011111111000111111" ND(26) = "1110001111110111011110111110111011111011101111101110111110111011111011101001101111011001111110001011" ND(27) = "1000001111110111011111011101111101110111110000111111010111111101101111110110111111011101111000110011" ND(28) = "1110000011110111101111011110111101111111111001111111111001111111111011110111101111011110111100000111" ND(29) = "1000000011101101101111110111111111011111111101111111110111111111011111111101111111110111111110001111" ND(30) = "1000100011110111011111011101111101110111110111011111011101111101110111110111011111011101111110001111" ND(31) = "1000100011110111011111011101111101110111111010111111101011111110101111111010111111110111111111011111" ND(32) = "1001010011110101011111010101111101010111110101011111001001111110101111111010111111101011111110101111" ND(33) = "1000100011110111011111101011111110101111111101111111110111111110101111111010111111011101111000100011" ND(34) = "1000100011110111011111011101111110101111111010111111110111111111011111111101111111110111111110001111" ND(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 For ii = 0 To 3 For iii = 1 To 10 If Rnd * 99 + 1 < cOdds Then Response.BinaryWrite vColorData(0) Else Response.BinaryWrite vColorData(Mid(ND(vCode(ii)), i * 10 + iii, 1)) End If Next Next Next End Sub %>