LanapBotDetect::TextStyleEnum Reference

documentation > asp captcha> api reference

LanapBotDetect::TextStyleEnum contains all valid values of the LanapBotDetect control's TextStyle property. It represents the distortion algorithm used for rendering of CAPTCHA images.

TextStyleEnum Members
TextStyleEnum Default
TextStyleEnum Usage
TextStyleEnum Notes
TextStyleEnum Screenshots

Members

[VB]
Public Enum CodeTypeEnum
  Chess = 0
  Distortion = 1
  Jail = 2
  Negative = 3
  Snow = 4
  Split = 5
  Wave = 6
  WantedCircular = 7
  Stitch = 8
  Chess3D = 9
  Circles = 10
  Corrosion = 11
  Chipped = 12
  Flash = 13
  Mass = 14
  Rough = 15
  BlackOverlap = 16
  Overlap = 17
  Overlap2 = 18
  Halo = 19
  ThickThinLines = 20
  ThickThinLines2 = 21
  SunRays = 22
  SunRays2 = 23
  Darts = 24
  FingerPrints = 25
  CrossShadow = 26
  CrossShadow2 = 27
  Lego = 28
  Strippy = 29
  ThinWavyLetters = 30
  Chalkboard = 31
  WavyColorLetters = 32
  AncientMosaic = 33
  Vertigo = 34
  WavyChess = 35
  MeltingHeat = 36
  SunAndWarmAir = 37
  Graffiti = 38
  Graffiti2 = 39
  Cut = 40
  SpiderWeb = 41
  Collage = 42
  InBandages = 43
  Ghostly = 44
  PaintMess = 45
  CaughtInTheNet = 46
  CaughtInTheNet2 = 47
  Bullets = 48
  Bullets2 = 49
End Enum

[C++]
typedef enum TextStyleEnum
{
  Chess = 0,
  Distortion = 1,
  Jail = 2,
  Negative = 3,
  Snow = 4,
  Split = 5,
  Wave = 6,
  WantedCircular = 7,
  Stitch = 8,
  Chess3D = 9,
  Circles = 10,
  Corrosion = 11,
  Chipped = 12,
  Flash = 13,
  Mass = 14,
  Rough = 15,
  BlackOverlap = 16,
  Overlap = 17,
  Overlap2 = 18,
  Halo = 19,
  ThickThinLines = 20,
  ThickThinLines2 = 21,
  SunRays = 22,
  SunRays2 = 23,
  Darts = 24,
  FingerPrints = 25,
  CrossShadow = 26,
  CrossShadow2 = 27,
  Lego = 28,
  Strippy = 29,
  ThinWavyLetters = 30,
  Chalkboard = 31,
  WavyColorLetters = 32,
  AncientMosaic = 33,
  Vertigo = 34,
  WavyChess = 35,
  MeltingHeat = 36,
  SunAndWarmAir = 37,
  Graffiti = 38,
  Graffiti2 = 39,
  Cut = 40,
  SpiderWeb = 41,
  Collage = 42,
  InBandages = 43,
  Ghostly = 44,
  PaintMess = 45,
  CaughtInTheNet = 46,
  CaughtInTheNet2 = 47,
  Bullets = 48,
  Bullets2 = 49
} TextStyleEnum;

[back to top]

Default value

If the TextStyle property is not set, 31 (Chalkboard) is used by default.

[back to top]

Usage

[ASP]

' Assume we are using the LanapBotDetectHandler.asp helper

' Example 1: simple assignment
<img src=
  "LanapBotDetectHandler.asp?Command=CreateImage&TextStyle=4" 
  alt="CAPTCHA image" />
	
' Example 2: randomization
<%
Function RandomFromRange(lowerLimit, upperLimit)
  Dim num
  Randomize
  num = CInt((upperlimit - lowerlimit)*Rnd() + lowerlimit) 
  RandomFromRange = num
End Function

Function RandomFromValues(values)
  Dim num
  Randomize
  num = RandomFromRange(0, UBound(values))
  RandomFromValues = values(num)
End Function

Dim algorithms(5)
algorithms(0) = 28
algorithms(1) = 36
algorithms(2) = 44
algorithms(3) = 25
algorithms(4) = 39
algorithms(5) = 48

Dim style 
style = RandomFromValues(algorithms)
%>

<img src=
  "LanapBotDetectHandler.asp?Command=
  CreateImage&TextStyle=<%=style%>" alt="CAPTCHA image" />

Direct access examples:

[VB]
Set objCaptcha = CreateObject("LanapBotDetect")
objCaptcha.TextStyle = 4

[PHP]
$objCaptcha = new COM('LanapBotDetect');
$objCaptcha->TextStyle = 4;

[Ruby]
require 'win32ole'
objCaptcha = WIN32OLE.new('LanapBotDetect')
objCaptcha.TextStyle = 4

[back to top]

Notes

While some CAPTCHA algorithms always uppercase the random code drawn in the image and some always lowercase it, CAPTCHA validation is always case-insensitive.

You might communicate this fact to your users by automatically uppercasing (or lowercasing) the input as they type. This can be achieved with JavaScript, and can prevent any confusion on the part of the user about how exactly they need to type the CAPTCHA code.

[back to top]