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ASP生成动态验证码  

2009-03-10 10:18:00|  分类: 默认分类 |  标签: |举报 |字号 订阅

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<%
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()     ' 将验证码存到Session中
     mCode.Output()     ' 输出数据
     Set mCode = Nothing
%>

<%
If IsEmpty(Session("GetCode")) or Session("GetCode") <> UCase(Request.Form("Form_Code")) Then
     Response.Write "验证码输入错误"
     Response.End
Else
     Session("GetCode") = Empty     ' 清空Session
     Response.Write "验证码输入正确"
     Response.End
End If
%>
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