No component generates verification code-GIF format

<%
Option explicit 'display Declaration

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' probability of occurrence of interference points
Count = 4' Character Count
Width = 80' Image Width
Height = 20' Image Height
Angle = 2' random angle variation
Offset = 20' offset random variation
Border = 1' border size
End sub

Public Function create ()

Const ccharsets = "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 Coordinate
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

'Terminal Coordinate
Vendx = (dotdata (pindex) (2 * I)-1) * vwidth/100

Vendy = (dotdata (pindex) (2 x I + 1)-1) * vheight/100

'Horizontal gap
Vdx = vendx-vstartx
'Vertical gap
Vdy = vendy-vstarty

'Skew Angle
If vdx = 0 then
Vangle = SGN (vdy) * 3.14/2
Else
Vangle = ATN (vdy/vdx)
End if

'Coordinate distance
If Sin (vangle) = 0 then
Vlength = vdx
Else
Vlength = vdy/sin (vangle)
End if

'Random rotation angular
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 info
Response. binarywrite chrb (ASC ("8") & chrb (ASC ("9") & chrb (ASC (""))
'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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