摘要:
无组件生成验证码:GIF格式的asp代码:第一版使用了数字+字母,但是第二版的安全性已经大大提高,已经不需要再使用字母,因为数字“0”和字母“o”容易混杂,所以也把数字“0”取消了,总之一句话,一切为了用户。关键字:
验证码 GIF 正文:
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
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' Author: Layen support@ssaw.net 84815733(QQ)
' Thanks: Laomi, Laomiao, NetRube
' 2006-01-02
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