无组件生成验证码-GIF格式：

<%
Option Explicit '' 显示声明

Class Com_GifCode_Class
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
'' Author: Layen support@ssaw.net 84815733(QQ)
'' Thanks: Laomi, Laomiao, NetRube
'' 2006-01-02
''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''''
Public Noisy, Count, Width, Height, Angle, Offset, Border
Private Graph(), Margin(3)

Private Sub Class_Initialize()
    Randomize
    Noisy = 16 '' 干扰点出现的概率
    Count = 4 '' 字符数量
    Width = 80 '' 图片宽度
    Height = 20 '' 图片高度
    Angle = 2 '' 角度随机变化量
    Offset = 20 '' 偏移随机变化量
    Border = 1 '' 边框大小
End Sub

Public Function Create()
    Const cCharSet = "123456789"
    
    Dim i, x, y
    
    Dim vValidCode : vValidCode = ""
    Dim vIndex
    
    ReDim Graph(Width-1, Height-1)
    
    For i = 0 To Count - 1
        vIndex = Int(Rnd * Len(cCharSet))
        vValidCode = vValidCode + Mid(cCharSet, vIndex+1 , 1)
        SetDraw vIndex, i
    Next
    
    Create = vValidCode
End Function

Sub SetDot(pX, pY)
    If pX * (Width-pX-1) >= 0 And pY * (Height-pY-1) >= 0 Then
        Graph(pX, pY) = 1
    End If
End Sub

Public Sub SetDraw(pIndex, pNumber)
    '' 字符数据
    Dim DotData(8)
    DotData(0) = Array(30, 15, 50, 1, 50, 100)
    DotData(1) = Array(1 ,34 ,30 ,1 ,71, 1, 100, 34, 1, 100, 93, 100, 100, 86)
    DotData(2) = Array(1, 1, 100, 1, 42, 42, 100, 70, 50, 100, 1, 70)
    DotData(3) = Array(100, 73, 6, 73, 75, 6, 75, 100)
    DotData(4) = Array(100, 1, 1, 1, 1, 50, 50, 35, 100, 55, 100, 80, 50, 100, 1, 95)
    DotData(5) = Array(100, 20, 70, 1, 20, 1, 1, 30, 1, 80, 30, 100, 70, 100, 100, 80, 100, 60, 70, 50, 30, 50, 1, 60)
    DotData(6) = Array(6, 26, 6, 6, 100, 6, 53, 100)
    DotData(7) = Array(100, 30, 100, 20, 70, 1, 30, 1, 1, 20, 1, 30, 100, 70, 100, 80, 70, 100, 30, 100, 1, 80, 1, 70, 100, 30)
    DotData(8) = Array(1, 80, 30, 100, 80, 100, 100, 70, 100, 20, 70, 1, 30, 1, 1, 20, 1, 40, 30, 50, 70, 50, 100, 40)
    
    Dim vExtent : vExtent = Width / Count
    Margin(0) = Border + vExtent * (Rnd * Offset) / 100 + Margin(1)
    Margin(1) = vExtent * (pNumber + 1) - Border - vExtent * (Rnd * Offset) / 100
    Margin(2) = Border + Height * (Rnd * Offset) / 100
    Margin(3) = Height - Border - Height * (Rnd * Offset) / 100
    
    Dim vStartX, vEndX, vStartY, vEndY
    Dim vWidth, vHeight, vDX, vDY, vDeltaT
    
    Dim vAngle, vLength
    
    vWidth = Int(Margin(1) - Margin(0))
    
    vHeight = Int(Margin(3) - Margin(2))
    
    '' 起始坐标
    vStartX = Int((DotData(pIndex)(0)-1) * vWidth / 100)
    
    vStartY = Int((DotData(pIndex)(1)-1) * vHeight / 100)
    
    Dim i, j
    For i = 1 To UBound(DotData(pIndex), 1)/2
        If DotData(pIndex)(2*i-2) <> 0 And DotData(pIndex)(2*i) <> 0 Then
            '' 终点坐标
            vEndX = (DotData(pIndex)(2*i)-1) * vWidth / 100
            
            vEndY = (DotData(pIndex)(2*i+1)-1) * vHeight / 100
            
            '' 横向差距
            vDX = vEndX - vStartX
            '' 纵向差距
            vDY = vEndY - vStartY
            
            '' 倾斜角度
            If vDX = 0 Then
                vAngle = Sgn(vDY) * 3.14/2
            Else
                vAngle = Atn(vDY / vDX)
            End If
            
            '' 两坐标距离
            If Sin(vAngle) = 0 Then
                vLength = vDX
            Else
                vLength = vDY / Sin(vAngle)
            End If
            
            '' 随机转动角度
            vAngle = vAngle + (Rnd - 0.5) * 2 * Angle * 3.14 * 2 / 100
            
            vDX = Int(Cos(vAngle) * vLength)
            vDY = Int(Sin(vAngle) * vLength)
            
            If Abs(vDX) > Abs(vDY) Then vDeltaT = Abs(vDX) Else vDeltaT = Abs(vDY)
            
            For j = 1 To vDeltaT
                SetDot Margin(0) + vStartX + j * vDX / vDeltaT, Margin(2) + vStartY + j * vDY / vDeltaT
            Next
            
            vStartX = vStartX + vDX
            
            vStartY = vStartY + vDY
        End If
    Next
End Sub

Public Sub Output()
    Response.Expires = -9999
    Response.AddHeader "pragma", "no-cache"
    Response.AddHeader "cache-ctrol", "no-cache"
    Response.ContentType = "image/gif"
    
    '' 文件类型
    Response.BinaryWrite ChrB(Asc("G")) & ChrB(Asc("I")) & ChrB(Asc("F"))
    '' 版本信息
    Response.BinaryWrite ChrB(Asc("8")) & ChrB(Asc("9")) & ChrB(Asc("a"))
    '' 逻辑屏幕宽度
    Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
    '' 逻辑屏幕高度
    Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height \ 256) Mod 256)
    
    Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(0)
    '' 全局颜色列表
    Response.BinaryWrite ChrB(255) & ChrB(255) & ChrB(255)
    
    Response.BinaryWrite ChrB(0) & ChrB(85) & ChrB(255)
    
    '' 图象标识符
    Response.BinaryWrite ChrB(Asc(","))
    
    Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)
    '' 图象宽度
    Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
    '' 图象高度
    Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height \ 256) Mod 256)
    
    Response.BinaryWrite ChrB(0) & ChrB(7) & ChrB(255)
    
    Dim x, y, i : i = 0
    For y = 0 To Height - 1
        For x = 0 To Width - 1
            If Rnd < Noisy / 100 Then
                Response.BinaryWrite ChrB(1-Graph(x, y))
            Else
                If x * (x-Width) = 0 or y * (y-Height) = 0 Then
                    Response.BinaryWrite ChrB(Graph(x, y))
                Else
                    If Graph(x-1, y) = 1 or Graph(x, y) or Graph(x, y-1) = 1 Then
                        Response.BinaryWrite ChrB(1)
                    Else
                        Response.BinaryWrite ChrB(0)
                    End If
                End If
            End If
            If (y * Width + x + 1) Mod 126 = 0 Then
                Response.BinaryWrite ChrB(128)
                i = i + 1
            End If
            If (y * Width + x + i + 1) Mod 255 = 0 Then
                If (Width*Height - y * Width - x - 1) > 255 Then
                    Response.BinaryWrite ChrB(255)
                Else
                    Response.BinaryWrite ChrB(Width * Height Mod 255)
                End If
            End If
        Next
    Next
    Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(129) & ChrB(0) & ChrB(59)
End Sub

End Class

Dim mCode
Set mCode = New Com_GifCode_Class
Session("GetCode") = mCode.Create()
mCode.Output()
Set mCode = Nothing
%>

无组件生成验证码-BMP格式：

<%
Call Com_CreatValidCode("ValidCode")

Public Sub Com_CreatValidCode(pSN)

   '----------禁止缓存
   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 = 36 '---------文字数量，=10为只显示数字，=36为数字+字母
   Const cCode = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

   '-----------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(255) & ChrB(255) & ChrB(255) '------------蓝250，绿236，红211（浅蓝色）


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

   Dim vCode(4), vCodes
   For i = 0 To 3
       vCode(i) = Int(Rnd * cAmount)
       vCodes = vCodes & Mid(cCode, vCode(i) + 1, 1)
   Next

   Session(pSN) = vCodes   '--------记录入Session

   '-----------字符的数据
   Dim vNumberData(35)

   'Verdana Font
   vNumberData(0) = "1110000111110111101111011110111101111011110111101111011110111101111011110111101111100001111111111111"
   vNumberData(1) = "1111101111111000111111111011111111101111111110111111111011111111101111111110111111100000111111111111"
   vNumberData(2) = "1110000111110111101111011110111111111011111111011111110011111110111111110111111111000000111111111111"
   vNumberData(3) = "1110000111110111101111111110111111111011111100011111111110111111111011110111101111100001111111111111"
   vNumberData(4) = "1111110111111110011111110101111110110111110111011111000000011111110111111111011111111101111111111111"
   vNumberData(5) = "1110000011111011111111101111111110111111111000011111111110111111111011110111101111100001111111111111"
   vNumberData(6) = "1111000111111011111111011111111100000111110111101111011110111101111011110111101111100001111111111111"
   vNumberData(7) = "1100000011111111101111111101111111110111111110111111111011111111011111111101111111110111111111111111"
   vNumberData(8) = "1110000111110111101111011110111101111011111000011111011110111101111011110111101111100001111111111111"
   vNumberData(9) = "1110000111110111101111011110111101111011110111101111100000111111111011111111011111100011111111111111"

   'Other Font
   vNumberData(10) = "1111011111111101111111101011111110101111111010111111101011111100000111110111011111011101111000100011"
   vNumberData(11) = "1000000111110111101111011110111101110111110000111111011101111101111011110111101111011110111000000111"
   vNumberData(12) = "1110000011110111101110111110111011111111101111111110111111111011111111101111101111011101111110001111"
   vNumberData(13) = "1000001111110111011111011110111101111011110111101111011110111101111011110111101111011101111000001111"
   vNumberData(14) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011110111000000111"
   vNumberData(15) = "1000000111110111101111011011111101101111110000111111011011111101101111110111111111011111111000111111"
   vNumberData(16) = "1110000111110111011110111101111011111111101111111110111111111011100011101111011111011101111110001111"
   vNumberData(17) = "1000100011110111011111011101111101110111110000011111011101111101110111110111011111011101111000100011"
   vNumberData(18) = "1100000111111101111111110111111111011111111101111111110111111111011111111101111111110111111100000111"
   vNumberData(19) = "1110000011111110111111111011111111101111111110111111111011111111101111111110111110111011111000011111"
   vNumberData(20) = "1000100011110111011111011011111101011111110001111111010111111101101111110110111111011101111000100011"
   vNumberData(21) = "1000111111110111111111011111111101111111110111111111011111111101111111110111111111011110111000000011"
   vNumberData(22) = "1000100011110010011111001001111100100111110101011111010101111101010111110101011111010101111001010011"
   vNumberData(23) = "1000100011110011011111001101111101010111110101011111010101111101100111110110011111011001111000110111"
   vNumberData(24) = "1110001111110111011110111110111011111011101111101110111110111011111011101111101111011101111110001111"
   vNumberData(25) = "1000000111110111101111011110111101111011110000011111011111111101111111110111111111011111111000111111"
   vNumberData(26) = "1110001111110111011110111110111011111011101111101110111110111011111011101001101111011001111110001011"
   vNumberData(27) = "1000001111110111011111011101111101110111110000111111010111111101101111110110111111011101111000110011"
   vNumberData(28) = "1110000011110111101111011110111101111111111001111111111001111111111011110111101111011110111100000111"
   vNumberData(29) = "1000000011101101101111110111111111011111111101111111110111111111011111111101111111110111111110001111"
   vNumberData(30) = "1000100011110111011111011101111101110111110111011111011101111101110111110111011111011101111110001111"
   vNumberData(31) = "1000100011110111011111011101111101110111111010111111101011111110101111111010111111110111111111011111"
   vNumberData(32) = "1001010011110101011111010101111101010111110101011111001001111110101111111010111111101011111110101111"
   vNumberData(33) = "1000100011110111011111101011111110101111111101111111110111111110101111111010111111011101111000100011"
   vNumberData(34) = "1000100011110111011111011101111110101111111010111111110111111111011111111101111111110111111110001111"
   vNumberData(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   '----------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
                   Response.BinaryWrite vColorData(0)
              Else
                   Response.BinaryWrite vColorData(Mid(vNumberData(vCode(ii)), i * 10 + iii, 1))
              End If
           Next
       Next
   Next
End Sub
%>

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