反SPAM新思路—换Z-BLOG的验证码!

2019-01-13 19:40:43王振洲

        ' 执行干扰(dx,dy改作不同的方向标记用)
        If Abs(dx) > Abs(dy) Then dx = 1 Else dx = 0
        If dx = 1 Then
            If Int(Rnd*10) > 4 Then
                dy = 1
                way = -1
            Else
                dy = UnitHeight - 2
                way = 1
            End If
        Else
            If Int(Rnd*10) > 4 Then
                dy = 1
                way = -1
            Else
                dy = UnitWidth - 2
                way = 1
            End If
        End If
        For i=0 To deltaT
            For ii=ary(dx,i) To dy Step way
                Call pcd_setDot(ary(0,i)*dx+ii*(1-dx),ary(1,i)*(1-dx)+ii*(dx),str,pcd_getDot(ary(0,i)*dx+(ii+way)*(1-dx),ary(1,i)*(1-dx)+(ii+way)*(dx),str,UnitWidth),UnitWidth)
            Next
            '添补空白
            Call pcd_setDot(ary(0,i)*dx+(dy+way)*(1-dx),ary(1,i)*(1-dx)+(dy+way)*(dx),str,"1",UnitWidth)
        Next
    Next
    pcd_doubter = str
End Function

Rem 得到某点的字符
Function pcd_getDot(x,y,str,UnitWidth)
    pcd_getDot = Mid(str,x+1+y*UnitWidth,1)
End Function