This code is taken from the CF docs for CF 9.
I am trying to update our old forms to use cfimage to verify. Once I can get
the image to work, I can update the forms. However the issue is I have to link
to the form on the action page. could this all me done in one page, or is there
a better way?
<!---captcha1--->
<!--- Set the length of the text string for the CAPTCHA image. --->
<cfset stringLength=6>
<!--- Specify the list of characters used for the random text string. The
following list
limits the confusion between upper- and lowercase letters as well as
between numbers and
letters. --->
<cfset
stringList="2,3,4,5,6,7,8,9,a,b,d,e,f,g,h,j,n,q,r,t,y,A,B,C,D,E,F,G,H,K,L,M,N,P,Q,R,S,
T,U,V,W,X,Y,Z">
<cfset rndString="">
<!--- Create a loop that builds the string from the random characters. --->
<cfloop from="1" to="#stringLength#" index="i">
<cfset rndNum=RandRange(1,listLen(stringList))>
<cfset rndString=rndString & listGetAt(stringList,rndNum)>
</cfloop>
<!--- Hash the random string. --->
<cfset rndHash=Hash(rndString)>
<!--- Create the user entry form. --->
<cfform action="captcha2.cfm" method="post">
<!--- Use the randomly generated text string for the CAPTCHA image. --->
<p><cfimage action="captcha" fontSize="16" fonts="Times New Roman" width="215"
height="50"
text="#rndString#"></p>
<p>Please type what you see: </p>
<p><cfinput type="text" name="userInput" required="yes">
<cfinput type="hidden" name="hashVal" value="#rndHash#">
<p><cfinput type="Submit" name ="OK" value="OK"></p>
</cfform>
<!--- captcha2--->
<!--- Verify whether the text entered by the user matches the CAPTCHA string.
--->
<cfif #form.hashval# eq Hash(#form.userInput#)>
<cfoutput>
you got it!
</cfoutput>
<cfelse>
<p>I'm sorry; please try again.</p>
<a href="captcha1.cfm">go back to form</a>
</cfif>
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