<%
Option Explicit
Response.buffer=true
Response.Expires = -1
Response.ExpiresAbsolute = Now() - 1
Response.Addheader "cache-control","no-cache"
Response.AddHeader "Pragma","no-cache"
Response.ContentType = "Image/BMP"
Call Com_CreatValidCode()
Sub Com_CreatValidCode()
Randomize
Dim i, ii, iii
Const cOdds = 1 ' 杂点出现的机率
Const cAmount = 10 ' 文字数量
Const cCode = "0123456789"
' 颜色的数据(字符,背景)
Dim vColorData(1)
vColorData(0) = ChrB(0) &; ChrB(0) &; ChrB(2) ' 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
Session("Verifycode") = vCodes '记录入Session
' 字符的数据
Dim vNumberData(9)
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"
' 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
If Mid(vNumberData(vCode(ii)), i * 10 + iii, 1) Then
Response.BinaryWrite vColorData(0)
Else
Response.BinaryWrite vColorData(1)
End If
Else
Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1))
End If
Next
Next
Next
End Sub
%>