如何在ASP Classic中验证Google Recaptcha 2.0服务器端？

时间：2018-04-05 20:40:52

标签： asp-classic recaptcha

我需要帮助才能实现Google Recaptcha 2.0的答案。

在发送表单后，我尝试了几种方法来恢复响应，但不是consigui得到答案为真。

按照我尝试的示例：

<%@LANGUAGE=VBSCRIPT%>
<%
    Option Explicit
%>
<html>
    <head>
        <script src="https://www.google.com/recaptcha/api.js" async defer></script>
    </head>

    <body>
<%
    If Request.ServerVariables("REQUEST_METHOD") = "POST" Then
        Dim recaptcha_secret, sendstring, objXML
        ' Secret key
        recaptcha_secret = "xxxxxxxxxxsec"

        sendstring = "https://www.google.com/recaptcha/api/siteverify?secret=" & recaptcha_secret & "&response=" & Request.form("g-recaptcha-response")

        Set objXML = Server.CreateObject("MSXML2.ServerXMLHTTP")
        objXML.Open "GET", sendstring, False

        objXML.Send

        Response.write "<br><h3>Response: " & objXML.responseText & "</h3><br>"



  Set objXML = Nothing

  END If

%>

        <form method="post" action="">
            <!-- Site key -->
            <div class="g-recaptcha" data-sitekey="xxxxxxxxxx"></div>
            <br />
            <input type="submit" value="Try">
        </form>
    </body>
</html>

如何实施检查Recaptcha是否已标记的方法？

3 个答案:

答案 0 :(得分：2)

经过这么多次搜索后我终于找到了它 首先我使用这个asp类https://github.com/zhennanzhuce/js/blob/master/js/ueditor/1.4.3/asp/ASPJson.class.asp 然后验证我使用此

的响应 
    result = (objXML.responseText)

    Set oJSON = New aspJSON
    oJSON.loadJSON(result)

    Set objXML = Nothing

    success = oJSON.data("success")
    if success = "True" then

        action = "go to next page"

    else

        action = ""


    end if

现在使用的代码是：

<%@LANGUAGE=VBSCRIPT%>
<%
Option Explicit
%>
<html>
 <head>
    <script src="https://www.google.com/recaptcha/api.js" async defer></script>
</head>

<body>
<!-- #include file="aspJSON.asp"-->

<%
If Request.ServerVariables("REQUEST_METHOD") = "POST" Then
    Dim recaptcha_secret, sendstring, objXML
    ' Secret key
    recaptcha_secret = "XXXCCCXXXX"

    sendstring = "https://www.google.com/recaptcha/api/siteverify?onload=onloadCallback&render=explicit&secret=" & recaptcha_secret & "&response=" & Request.form("g-recaptcha-response")

    Set objXML = Server.CreateObject("MSXML2.ServerXMLHTTP")
    objXML.Open "GET", sendstring, False

    objXML.Send
    dim result, oJSON, success, action, errorCapatcha, errorMsg 

    result = (objXML.responseText)

    Set oJSON = New aspJSON
    oJSON.loadJSON(result)

    Set objXML = Nothing

    success = oJSON.data("success")
    if success = "True" then

        action = "go to next page"

    else

        action = "do nothing"


    end if

 END If

%>

    <form method="post" action="">
        <!-- Site key -->
        <div class="g-recaptcha" data-sitekey="XXXXXXXXX"></div>
        <br />
        <input type="submit" value="Try">
    </form>
</body>

非常感谢Lankymart，Leonardo Duarte

答案 1 :(得分：0)

首先下载json.asp https://github.com/tugrul/aspjson

在页面中插入

<script language="javascript" runat="server" src="json2.asp"></script>

作为回报，这样做

If success(objXML.responseText) = True Then

Response.write "success"

Elseif success(objXML.responseText) = False Then

Response.write "failure"

End If

调用函数获取json 

Function success(result)

Set motor = JSON.parse(result)      

success = motor.success

Set motor = Nothing

End Function

答案 2 :(得分：0)

有一种更好的方法，可以单独为ASP验证码而不是google验证码。您不需要添加JSON函数。 这是代码：

在您的提交页面上，添加：

   Type the number bellow:<br>
   <input type=text name="captchacode" value="" size=5 maxlength=5><br/>
   <img id="imgCaptcha" src="captcha.asp" /><br />
   <a href="javascript:void(0)" onclick="RefreshImage('imgCaptcha')">Refresh</a><br/>
<script language="Javascript">
function RefreshImage(valImageId) {
    var objImage = document.images[valImageId];
    if (objImage == undefined) {
        return;
    }
    var now = new Date();
    objImage.src = objImage.src.split('?')[0] + '?x=' + now.toUTCString();
}
</script>

将下面的函数插入到您的asp文件中：

'*******************************************************
function TestCaptcha(byval valSession, byval valCaptcha)
'*******************************************************
dim tmpSession
valSession = Trim(valSession)
valCaptcha = Trim(valCaptcha)
if (valSession = vbNullString) or (valCaptcha = vbNullString) then
   TestCaptcha = false
else
   tmpSession = valSession
   valSession = Trim(Session(valSession))
   Session(tmpSession) = vbNullString
   if valSession = vbNullString then
      TestCaptcha = false
   else
      valCaptcha = Replace(valCaptcha,"i","I")
      if StrComp(valSession,valCaptcha,1) = 0 then
         TestCaptcha = true
      else
         TestCaptcha = false
      end if
   end if
end if
end function

将下面的代码保存到captcha.asp：

<%@LANGUAGE="VBSCRIPT"%>
<%
'ASP Security Image Generator v4.0 - 13/July/2008
'Generate images to make a CAPTCHA test
'© 2006-2007 Emir Tüzül. All rights reserved.
'http://www.tipstricks.org

'This program is free software; you can redistribute it and/or
'modify it under the terms of the Common Public License
'as published by the Open Source Initiative OSI; either version 1.0
'of the License, or any later version.

'This program is distributed in the hope that it will be useful,
'but WITHOUT ANY WARRANTY; without even the implied warranty of
'MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
'Common Public License for more details.

'*[null pixel]Numbers[repeat count], #[text]Numbers[repeat count], &[row reference]number[referenced row index]
'First row [font height, chars...]
'Following rows [char width, pixel maps...]
FontMap = Array(_
split("13,A,B,C,D,E,F,G,H,I,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z,0,1,2,3,4,5,6,7,8,9",",") ,_
split("14,*5#4*5,*4#6*4,&2,&2,*3#3*2#3*3,&5,*2#4*2#4*2,*2#3*4#3*2,*2#10*2,*1#12*1,*1#3*6#3*1,&11,#3*8#3",",") ,_
split("11,#8*3,#10*1,#3*4#3*1,&3,&3,&1,&2,#3*4#4,#3*5#3,&9,&8,&2,#9*2",",") ,_
split("11,*4#6*1,*2#9,*1#4*4#2,*1#3*6#1,#3*8,&5,&5,&5,&5,&4,&3,&2,&1",",") ,_
split("12,#8*4,#10*2,#3*4#4*1,#3*5#3*1,#3*6#3,&5,&5,&5,&5,&4,&3,&2,&1",",") ,_
split("9,#9,&1,#3*6,&3,&3,#8*1,&6,&3,&3,&3,&3,&1,&1",",") ,_
split("9,#9,&1,#3*6,&3,&3,&1,&1,&3,&3,&3,&3,&3,&3",",") ,_
split("13,*4#7,*2#11,*1#4*5#3,*1#3*8#1,#3,#3,#3*4#6,&7,#3*7#3,*1#3*6#3,*1#5*4#3,&2,&1",",") ,_
split("11,#3*5#3,&1,&1,&1,&1,#11,&6,&1,&1,&1,&1,&1,&1",",") ,_
split("7,#7,#7,*2#3,&3,&3,&3,&3,&3,&3,&3,&3,&1,&1",",") ,_
split("8,*2#6,&1,*5#3,&3,&3,&3,&3,&3,&3,&3,*4#4,#7,#6",",") ,_
split("12,#3*5#4,#3*4#4,#3*3#4,#3*2#4,#3*2#3,#3*1#3,#7,#8,&5,#3*3#3,#3*4#3,#3*5#3,&1",",") ,_
split("9,#3,#3,#3,#3,#3,#3,#3,#3,#3,#3,#3,#9,#9",",") ,_
split("13,#3*7#3,#4*5#4,&2,#5*3#5,&4,#6*1#6,#3*1#2*1#2*1#3,#3*1#5*1#3,#3*2#3*2#3,&9,#3*7#3,&11,&11",",") ,_
split("11,#4*4#3,#5*3#3,&2,#6*2#3,&4,#3*1#3*1#3,&6,#3*2#6,&8,#3*3#5,&10,#3*4#4,#3*5#3",",") ,_
split("13,*4#5,*2#9,*1#4*3#4,*1#3*5#3,#3*7#3,&5,&5,&5,&5,&4,&3,&2,&1",",") ,_
split("10,#8,#9,#3*3#4,#3*4#3,&4,&4,&3,&2,#7,#3,#3,#3,#3",",") ,_
split("13,*3#6,*2#8,*1#3*4#3,*1#2*6#2,#2*8#2,&5,&5,#2*4#1*3#2,#2*4#2*2#2,*1#2*4#4,&3,*2#10,*3#6*2#2",",") ,_
split("12,#8,#9,#3*4#3,&3,&3,#3*3#4,&2,&1,#3*2#4,#3*3#3,&3,#3*4#4,#3*5#4",",") ,_
split("11,*3#6,*1#9,#4*4#2,#3*6#1,#4,#8,&2,*3#8,*7#4,#1*7#3,#3*4#4,#10,*1#7",",") ,_
split("11,#11,&1,*4#3,&3,&3,&3,&3,&3,&3,&3,&3,&3,&3,&3",",") ,_
split("11,#3*5#3,&1,&1,&1,&1,&1,&1,&1,&1,&1,#4*3#4,*1#9,*3#5",",") ,_
split("14,#3*8#3,*1#3*6#3,&2,*1#3*5#4,*2#3*4#3,&5,*3#3*2#3,&7,&7,*4#6,&10,&10,*5#4",",") ,_
split("17,#3*4#3*4#3,&1,#3*3#5*3#3,*1#3*2#2*1#2*2#3,&4,*1#3*1#3*1#3*1#3,&6,*1#3*1#2*3#2*1#3,&8,*2#5*3#5,&10,*2#4*5#4,&12",",") ,_
split("14,#4*6#4,*1#4*4#4,*2#4*2#4,*3#3*2#3,*3#8,*4#6,*5#4,&6,&5,&4,&3,&2,&1",",") ,_
split("13,#4*5#4,*1#3*5#3,*2#3*3#3,*2#4*1#4,*3#3*1#3,*3#7,*4#5,*5#3,&8,&8,&8,&8,&8",",") ,_
split("10,#10,&1,*6#4,*5#4,*5#3,*4#3,*3#4,*3#3,*2#3,*1#4,#4,&1,&1",",") ,_
split("10,*3#4*3,*1#8*1,*1#3*2#3*1,#3*4#3,&4,&4,&4,&4,&4,&4,&3,&2,&1",",") ,_
split("9,*3#3*3,&1,#6*3,&3,*3#3*3,&5,&5,&5,&5,&5,&5,#9,&12",",") ,_
split("10,*1#6*3,#8*2,#2*3#4*1,#1*5#3*1,*6#3*1,&5,*5#3*2,*4#4*2,*3#4*3,*2#4*4,*1#4*5,#10,&12",",") ,_
split("11,*1#8*2,#10*1,#3*5#3,#1*7#3,*7#3*1,*3#6*2,*3#7*1,*7#4,*8#3,&4,#3*4#4,&2,*1#7*3",",") ,_
split("12,*6#4*2,*5#5*2,&2,*4#2*1#3*2,*3#3*1#3*2,*2#3*2#3*2,*1#3*3#3*2,#3*4#3*2,#12,&9,*7#3*2,&11,&11",",") ,_
split("11,*1#10,&1,*1#3*7,&3,*1#8*2,*1#9*1,*7#4,*8#3,&8,#1*7#3,#3*4#3*1,#10*1,*1#7*3",",") ,_
split("11,*4#6*1,*2#8*1,*1#4*6,*1#3*7,#3*1#5*2,#10*1,#3*4#4,#3*5#3,&8,&8,*1#3*3#3*1,*1#9*1,*3#5*3",",") ,_
split("11,#11,&1,*7#4,*7#3*1,*6#4*1,*6#3*2,*5#3*3,*4#4*3,*4#3*4,*3#4*4,*3#3*5,*2#3*6,*1#4*6",",") ,_
split("11,*2#7*2,*1#9*1,#3*4#4,#3*5#3,#4*3#3*1,*1#8*2,&1,*1#3*1#5*1,&4,&4,#4*3#4,&2,*2#6*3",",") ,_
split("11,*3#5*3,*1#9*1,*1#3*3#3*1,#3*5#3,&4,&4,#4*4#3,*1#10,*2#5*1#3,*7#3*1,*6#4*1,*1#8*2,*1#6*4",",") _
)'Previous row must end with _

'#Begin ColorMap
const BmpColorMap = "dffeff000c851700eceeee006c363600da644a00"

ColorMap = Array(_
split("00,01,01,03",",") ,_
split("02,03,03,01",",") ,_
split("00,04,04,02",",") _
)'End ColorMap

'#Auto calculated variables
dim ImageWidth, ImageHeight, arrTextWidth(), TextHeight, LeftMargin, arrTopMargin(), CursorPos
dim BmpEndLine, BColor, TColor, NColor
dim i, j, k, x, y

'#Editable consts and variables
dim Bitmap(40,200) '[Height,Width]
const CodeLength = 5 'Secure code length (Max:8)
const CodeType = 0 '0[Random numbers], 1[Random chars and numbers], 2[Fake word]
const CharTracking = 35 'Set the tracking between two characters
const RndTopMargin = true 'Randomize top margin every character
const NoiseEffect = 0 '0[none], 1[sketch], 2[random foreground lines], 3[random background lines], 4[1 and 3 (Recommed maximum NoiseLine=4)]
const NoiseLine = 3 'Low values make easy OCR, high values decrease readability
const MinLineLength = 6 'Minimum noise line length
const SessionName = "ASPCAPTCHA" 'Where store your secure code

'#Subroutines and functions
'*****************************
function CreateGUID(valLength)
'*****************************
if CodeType = 1 then
   strValid = "A0B1C2D3E4F5G6H7I8J9K8L7M6N5O4P3Q2R1S0T1U2V3W4X5Y6Z7"
else
   strValid = "0516273849"
end if
tmpGUID = vbNullString
tmpChr = vbNullString
Randomize(Timer)
for cGUID=1 to valLength
    do
      tmpChr = Mid(strValid, Int(Rnd(1) * Len(strValid)) + 1, 1)
    loop while CStr(tmpChr) = CStr(Right(tmpGUID,1))
    tmpGUID = tmpGUID & tmpChr
Next
CreateGUID = tmpGUID
end function

'***************************
function FakeWord(valLength)
'***************************
arrChars = Array("AEIOU", "BCDFGHJKLMNPQRSTVWXYZ")
cVowel = 0
cConsonant = 0
tmpWord = vbNullString
Randomize(Timer)
for cWord=1 to valLength
    if (cWord=2) or ((valLength > 1) and (cWord = valLength)) then
        ixChars = 1-ixChars
    elseif (cVowel < 2) and (cConsonant < 2) then
        ixChars = Int(Rnd(1) * 2)
    elseif (cVowel < 2) then
        ixChars = 0
    elseif (cConsonant < 2) then
        ixChars = 1
    end if
    Pattern = arrChars(ixChars)
    tmpWord = tmpWord & Mid(Pattern, Int(Rnd(1) * Len(Pattern)) + 1, 1)
    if ixChars = 0 then
        cVowel = cVowel + 1
        cConsonant = 0
    else
        cVowel = 0
        cConsonant = cConsonant + 1
    end if
next
FakeWord = tmpWord
end function

'**********************************
function RndInterval(valMin,valMax)
'**********************************
Randomize(Timer)
RndInterval = Int(((valMax - valMin + 1) * Rnd()) + valMin)
end function

'**************************
function GetCharMap(valChr)
'**************************
dim i, j
j = 0
for i=1 to UBound(FontMap(0))
    if CStr(FontMap(0)(i)) = CStr(valChr) then
       j = i
      exit for
    end if
next
if j > 0 then
   GetCharMap = FontMap(j)
else
   GetCharMap = Array(0)
end if
end function

'************************************************
sub WriteCanvas(byval valChr, byval valTopMargin)
'************************************************
dim i, j, k, curPos, tmpChr, arrChrMap, strPixMap, drawPixel, pixRepeat

'find char map
arrChrMap = GetCharMap(valChr)
if UBound(arrChrMap) < 1 then
   exit sub
end if
for i=1 to UBound(arrChrMap)
   'get pixel map active line
    strPixMap = arrChrMap(i)
    if Left(strPixMap,1) = "&" then
       j = Mid(strPixMap,2)
       if (IsNumeric(j) = true) then
          strPixMap = arrChrMap(CInt(j))
       else
          strPixMap = vbNullString
       end if
    end if
    strPixMap = Trim(strPixMap)

    'drawing pixel
    curPos = CursorPos
    drawPixel = false
    pixRepeat = vbNullString
    for j=1 to Len(strPixMap)
        tmpChr = Mid(strPixMap,j,1)
        if (IsNumeric(tmpChr) = true) and (j < Len(strPixMap)) then
           pixRepeat = pixRepeat & tmpChr
        else
           'end pixel map?
           if IsNumeric(tmpChr) = true then
              pixRepeat = pixRepeat & tmpChr
           end if
           'draw pixel
           if (drawPixel = true) and (IsNumeric(pixRepeat) = true) then
              for k=1 to CInt(pixRepeat)
                  curPos = curPos + 1
                  Bitmap((valTopMargin + i),curPos) = TColor
              next
           elseif IsNumeric(pixRepeat) = true then
              curPos = curPos + CInt(pixRepeat)
           end if

           'what is new command?
           if tmpChr = "#" then
              drawPixel = true
           else
              drawPixel = false
           end if
           pixRepeat = vbNullString
        end if
    next
next
end sub

'*******************************
sub PrepareBitmap(valSecureCode)
'*******************************
dim i, j
'image dimensions
ImageWidth = UBound(Bitmap,2)
ImageHeight = UBound(Bitmap,1)

'char and text width
redim arrTextWidth(CodeLength)
arrTextWidth(0) = 0
for i=1 to CodeLength
    arrTextWidth(i) = CInt(GetCharMap(Mid(secureCode,i,1))(0))
    arrTextWidth(0) = arrTextWidth(0) + arrTextWidth(i)
next
arrTextWidth(0) = arrTextWidth(0) + ((CodeLength - 1) * CharTracking)

'text height
TextHeight = CInt(FontMap(0)(0))

'left margin
LeftMargin = Round((ImageWidth - arrTextWidth(0)) / 2)

'top margin
redim arrTopMargin(CodeLength)
arrTopMargin(0) = Round((ImageHeight - TextHeight) / 2)
if RndTopMargin = true then
    for i=1 to CodeLength
        arrTopMargin(i) = RndInterval(Int(arrTopMargin(0) / 2),(arrTopMargin(0) + Round(arrTopMargin(0) / 2)))
    next
else
    for i=1 to CodeLength
        arrTopMargin(i) = arrTopMargin(0)
    next
end if

'color selection
i = RndInterval(0,UBound(ColorMap))
BColor = ColorMap(i)(0)
NColor = ColorMap(i)(1)
TColor = ColorMap(i)(2)

'Apply background effect
if NoiseEffect = 3 then
    AddNoise()
end if

'write text
for i=1 to CodeLength
    'calculate cursor pos
    CursorPos = 0
    for j=(i-1) to 1 step -1
        CursorPos = CursorPos + arrTextWidth(j) + CharTracking
    next
    CursorPos = LeftMargin + CursorPos

    'write active char
    WriteCanvas Mid(secureCode,i,1),arrTopMargin(i)
next
end sub

'***********************************
sub DrawLine(x0, y0, x1, y1, valClr)
'***********************************
'Reference from Donald Hearn and M. Pauline Baker, Computer Graphics C Version
dim m, b, dx, dy
if (NoiseEffect = 4) and (Bitmap(y0,x0) = TColor) then
    clrNoise = vbNullString
else
    clrNoise = valClr
end if
Bitmap(y0,x0) = clrNoise

dx = x1 - x0
dy = y1 - y0
if Abs(dx) > Abs(dy) then
    m = (dy / dx)
    b = y0 - (m * x0)
    if dx < 0 then
        dx = -1
    else
        dx = 1
    end if

    do while x0 <> x1
        x0 = x0 + dx
        if (NoiseEffect = 4) and (Bitmap(Round((m * x0) + b),x0) = TColor) then
            clrNoise = vbNullString
        else
            clrNoise = valClr
        end if
        Bitmap(Round((m * x0) + b),x0) = clrNoise
    loop
elseif dy <> 0 then
    m = (dx / dy)
    b = x0 - (m * y0)

    if dy < 0 then
        dy = -1
    else
        dy = 1
    end if

    do while y0 <> y1
        y0 = y0 + dy

        if (NoiseEffect = 4) and (Bitmap(y0,Round((m * y0) + b)) = TColor) then
            clrNoise = vbNullString
        else
            clrNoise = valClr
        end if
        Bitmap(y0,Round((m * y0) + b)) = clrNoise
    loop
end if
end sub

'*************
sub AddNoise()
'*************
dim median, i, j, x0, y0, x1, y1, dx, dy, dxy

if NoiseEffect = 1 then
    clrNoise = vbNullString
else
    clrNoise = NColor
end if

for i=1 to NoiseLine
    x0 = RndInterval(1,ImageWidth)
    y0 = RndInterval(1,ImageHeight)
    x1 = RndInterval(1,ImageWidth)
    y1 = RndInterval(1,ImageHeight)

    'Check minimum line length
    dx = Abs(x1 - x0)
    dy = Abs(y1 - y0)
    median = Round(Sqr((dx * dx) + (dy * dy))/2)
    if median < MinLineLength then
        dxy = MinLineLength - median

        if x1 < x0 then
            dx = -1
        else
            dx = 1
        end if

        if y1 < y0 then
            dy = -1
        else
            dy = 1
        end if

        for j=1 to dxy
            if ((x1 + dx) < 1) or ((x1 + dx) > ImageWidth) or ((y1 + dy) < 1) or ((y1 + dy) > ImageHeight) then
                exit for
            end if
            x1 = x1 + dx
            y1 = y1 + dy
        next
    end if

    'Draw noise line
    DrawLine x0,y0,x1,y1,clrNoise
next
end sub

'*****************************************************************
function FormatHex(byval valHex,byval fixByte,fixDrctn,valReverse)
'*****************************************************************
fixByte = fixByte * 2
tmpLen = Len(valHex)
if fixByte > tmpLen then
    tmpFixHex = String((fixByte - tmpLen),"0")
    if fixDrctn = 1 then
        valHex = valHex & tmpFixHex
    else
        valHex = tmpFixHex & valHex
    end if
end if

if valReverse = true then
    tmpHex = vbNullString
    for cFrmtHex=1 to Len(valHex) step 2
        tmpHex = Mid(valHex,cFrmtHex,2) & tmpHex
    next
    FormatHex = tmpHex
else
    FormatHex = CStr(valHex)
end if
end function

'******************
sub SendHex(valHex)
'******************
for cHex = 1 to Len(valHex) step 2
    Response.BinaryWrite ChrB(CByte("&H" & Mid(valHex,cHex,2)))
next
end sub

'***************
sub SendBitmap()
'***************
if (ImageWidth mod 4) <> 0 then
    BmpEndLine = String((4-(ImageWidth mod 4))*2,"0")
else
    BmpEndLine = vbNullString
end if
BmpInfoHeader = Array("28000000","00000000","00000000","0100","0800","00000000","00000000","120B0000","120B0000","00000000","00000000")
BmpInfoHeader(1) = FormatHex(Hex(ImageWidth),4,0,true)
BmpInfoHeader(2) = FormatHex(Hex(ImageHeight),4,0,true)
BmpInfoHeader(6) = FormatHex(Hex((ImageHeight * ImageWidth) + (ImageHeight * (Len(BmpEndLine) / 2))),4,0,true)
BmpInfoHeader(9) = FormatHex(Hex(Len(BmpColorMap)/8),4,0,true)
BmpInfoHeader(10) = BmpInfoHeader(9)
BmpHeader = Array("424D","00000000","0000","0000","00000000")
BmpHeader(1) = FormatHex(Hex((Len(Join(BmpHeader,"")) / 2) + (Len(Join(BmpInfoHeader,"")) / 2) + (Len(BmpColorMap) / 2) + (ImageHeight * ImageWidth) + (ImageHeight * (Len(BmpEndLine) / 2))),4,0,true)
BmpHeader(4) = FormatHex(Hex((Len(Join(BmpHeader,"")) / 2) + (Len(Join(BmpInfoHeader,"")) / 2) + (Len(BmpColorMap) / 2)),4,0,true)

Response.Clear
Response.Buffer = True
Response.ContentType = "image/bmp"
Response.AddHeader "Content-Disposition", "inline; filename=captcha.bmp"
Response.CacheControl = "no-cache"
Response.AddHeader "Pragma", "no-cache"
Response.Expires = -1

SendHex(Join(BmpHeader,""))
SendHex(Join(BmpInfoHeader,""))
SendHex(BmpColorMap)
for y=ImageHeight to 1 step -1
    for x=1 to ImageWidth
        tmpHex = Bitmap(y,x)
        if tmpHex = vbNullString then
            SendHex(BColor)
        else
            SendHex(tmpHex)
        end if
    next
    SendHex(BmpEndLine)
next
Response.Flush
end sub

'#Generate captcha
if CodeType < 2 then
    secureCode = CreateGUID(CodeLength)
else
    secureCode = FakeWord(CodeLength)
end if
Session(SessionName) = secureCode
PrepareBitmap(secureCode)
if (NoiseEffect > 0) and (NoiseEffect <> 3) then
    AddNoise()
end if
SendBitmap()
%>

在处理之前，请验证验证码：

<%
if not TestCaptcha("ASPCAPTCHA", request("captchacode")) then
   response.write "Captcha error!"
   response.end
end if
response.write "Captcha OK"
'... process...

%>
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