ASP implements component-free generation of verification codes in GIF format. Friends who need asp verification codes can refer to it. Copy the code code as follows:
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Option Explicit ' Display declaration
Class Com_GifCode_Class
'''''''''''''''''''''''''''''''''''''''
' Author: Layen [email protected] 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 ' Probability of interference point occurrence
Count = 4 'Number of characters
Width = 80 'image width
Height = 20 'image height
Angle = 2 ' Random change in angle
Offset = 20 ' Offset random variation
Border = 1 'Border size
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)
'Character data
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))
'Start coordinates
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
'End point coordinates
vEndX = (DotData(pIndex)(2*i)-1) * vWidth / 100
vEndY = (DotData(pIndex)(2*i+1)-1) * vHeight / 100
'Horizontal gap
vDX = vEndX - vStartX
'Vertical gap
vDY = vEndY - vStartY
'Tilt angle
If vDX = 0 Then
vAngle = Sgn(vDY) * 3.14/2
Else
vAngle = Atn(vDY / vDX)
End If
'Distance between two coordinates
If Sin(vAngle) = 0 Then
vLength = vDX
Else
vLength = vDY / Sin(vAngle)
End If
' Random rotation angle
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
'File type
Response.BinaryWrite ChrB(Asc(G)) & ChrB(Asc(I)) & ChrB(Asc(F))
'Version information
Response.BinaryWrite ChrB(Asc(8)) & ChrB(Asc(9)) & ChrB(Asc(a))
'Logical screen width
Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width / 256) Mod 256)
'Logical screen height
Response.BinaryWrite ChrB(Height Mod 256) & ChrB((Height / 256) Mod 256)
Response.BinaryWrite ChrB(128) & ChrB(0) & ChrB(0)
'Global color list
Response.BinaryWrite ChrB(255) & ChrB(255) & ChrB(255)
Response.BinaryWrite ChrB(0) & ChrB(85) & ChrB(255)
'Image identifier
Response.BinaryWrite ChrB(Asc(,))
Response.BinaryWrite ChrB(0) & ChrB(0) & ChrB(0) & ChrB(0)
'Image width
Response.BinaryWrite ChrB(Width Mod 256) & ChrB((Width / 256) Mod 256)
'Image height
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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