记得“想当年”某天上午在这里路过，看到一位朋友贴的自己写的验证码程序，虽然他的程序是黑白有杂点，但其实很容易被破解的，但却有不少人喜欢着。。。没办法，当天下午研究了一翻 BMP 图片，然后就写出了这些代码，只是当初没有公布，眼看今天这么多坏人乱在很多论坛上注册用户来发广告，所以才贴出来共享一下。

本验证码生成程序特点如下：

一、彩色；

二、BMP 图像色深为 16 位，生成的图片体积更小；(4位长的验证码只有几百字节)

三、长度可自定义；(1位至25位可固定设置，也可以自己改成动态)

四、背景杂色深度可自定义；

具体请看代码

注：代码中并没有针对动网的 设置验证码 Session 的地方。想用的朋友自己根据需要改一下，位置就在代码中出现  Session("Num") 的那一行，改成自己需要的名称就可以了。这个验证码也可以用在任何需要验证码的地方。不用在动网论坛也可。

下面是代码部分：

<--r>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) & C