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復制下面代碼，存為c_validcode.asp上傳到function下就可以了

復制代碼代碼如下:

<%@ CODEPAGE=65001 %>
<%
'///////////////////////////////////////////////////////////////////////////////
'//              Z-Blog
'// 作    者:    朱煊(zx.asd),sipo
'// 版權(quán)所有:    RainbowSoft Studio
'// 技術(shù)支持:    [email protected]
'// 單元名稱:    c_validcode.asp
'// 開始時間:    2007-4-4
'// 最后修改:    2007-4-4
'// 備    注:    www.dc9.cn
'///////////////////////////////////////////////////////////////////////////////
%>
<% Option Explicit %>
<% On Error Resume Next %>


<%
'.VerifyCode GetVerifyNumber, False
Class Com_GifCode_Class
Public Noisy, Count, Width, Height, Angle, Offset, Border
Private Graph(), Margin(3)
Private Sub Class_Initialize()
Randomize
Noisy = 7 ' 干擾點出現(xiàn)的概率
Count = 5  ' 字符數(shù)量
Width = 60 ' 圖片寬度
Height = 20 ' 圖片高度
Angle = 3  ' 角度隨機變化量
Offset = 10 ' 偏移隨機變化量
Border = 2 ' 邊框大小
End Sub
Public Function Create(str)
Dim i
Dim vIndex
ReDim Graph(Width-1, Height-1)
For i = 0 To Count - 1
  vIndex=CInt(Mid(str,i+1,1)-1)
  SetDraw vIndex, i
Next
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)
' 字符數(shù)據(jù)字典
If pIndex=-1 Then pIndex=9
Dim DotData(9)
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)
DotData(9) = Array(100, 20, 70, 1, 20, 1, 1, 30, 1, 80, 30, 100, 70, 100, 100, 80, 100, 60, 90, 20, 80,3)

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))
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
   vEndX = (DotData(pIndex)(2*i)-1) * vWidth / 100
   vEndY = (DotData(pIndex)(2*i+1)-1) * vHeight / 100
   vDX = vEndX - vStartX
   vDY = vEndY - vStartY
   If vDX = 0 Then
    vAngle = Sgn(vDY) * 3.14/2
   Else
    vAngle = Atn(vDY / vDX)
   End If
   If Sin(vAngle) = 0 Then
    vLength = vDX
   Else
    vLength = vDY / Sin(vAngle)
   End If
   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"
Response.BinaryWrite ChrB(Asc("G")) & ChrB(Asc("I")) & ChrB(Asc("F"))
Response.BinaryWrite ChrB(Asc("8")) & ChrB(Asc("9")) & ChrB(Asc("a"))
Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height \ 256) Mod 256)
Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(0)
Response.BinaryWrite ChrB(250) & ChrB(250) & ChrB(250)
Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0)
Response.BinaryWrite ChrB(Asc(","))
Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)
Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width \ 256) Mod 256)
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))
   ElseIf x * (x-Width) = 0 Or y * (y-Height) = 0 Then
    Response.BinaryWrite ChrB(Graph(x, y))
   ElseIf 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

   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
Dim code
Set mCode = New Com_GifCode_Class
mCode.Create(GetVerifyNumber)
mCode.Output()
Set mCode = Nothing
%>