Heh heh.... That reminds me of Taz's P.A.S.S.W.O.R.D generator that got posted a while
back.... (except yours really works)
Getting back on to the random string thing...
If you use a random string for an activiation key make sure you either make sure that
the string hasn't been used before or ensure that there is a unique identifier that
goes with the activation key.
Depending on whether you care how long the activation code is and if you're providing
a URL in an email for the user to click on, you could always just use CreateUUID()
Having said that, if you decide to go this way, run a quick bit of code to make sure
that CreateUUID isn't generating sequential numbers. In older versions of CF on some
operating systems CreateUUID generated sequential numbers. (Don't ask me which cos I
can't remember ;o) )
This would make a bit of a security flaw in terms of activiation codes, because an
unscrupulous "user" could guess other people's activation codes.
<cfloop from="1" to="20" index="i">
<cfoutput>#CreateUUID()#</cfoutput>
</cfloop>
Will give you 20 UUIDs and you'll immediately be able to see if they are generated
sequentially or not.
Regards
Stephen
---- Message from "Steve Martin" <[EMAIL PROTECTED]> at 14:40:47 2003-07-17 ------
>And here's another one that I prepared earlier:
>
><cfscript>
>
>function getRandChar() {
> // Set the lower & upper ASCII limits
> low = 48;
> high = 122;
> randCharAsc = randrange(low,high);
> // constrain to alphanumerics by excluding certain ranges
> if ((randCharAsc gte 58 and randCharAsc lte 64) or (randCharAsc gte 91 and
> randCharAsc lte 96))
> // Hey look kids, recursion
> randChar = getRandChar();
> else
> randChar = Chr(randCharAsc);
> return randChar;
>}
>
>function randPassword( length ) {
> pwd = "";
> for(i=1;i lte length;i=i+1) {
> pwd = pwd & getRandChar();
> }
> return pwd;
>}
>
></cfscript>
>
><cfoutput>#randPassword(6)#</cfoutput>
>
>Steve
>
>> -----Original Message-----
>> From: Kevin Faulkner [mailto:[EMAIL PROTECTED]
>> Sent: 17 July 2003 14:35
>> To: '[EMAIL PROTECTED]'
>> Subject: RE: [ cf-dev ] Creating a random string
>>
>>
>> here you go; just specify what you want in the string. It
>> helps prevent
>> confusion between i and I and 1 for example....
>>
>> <CFSET uniqueKey="">
>> <CFSET keyLength=10>
>> <CFSET theString="234567890ABCDEFGHJKLMNOPQRSTUVWXYZ">
>>
>> <CFLOOP from="1" to="#keyLength#" index="loop">
>> <CFSET uniqueKey = #uniqueKey# &
>> #MID(theString,RANDRANGE(1,LEN(theString)),1)#>
>> </CFLOOP>
>>
>> <CFOUTPUT>
>> #uniqueKey#
>> </CFOUTPUT>
>>
>>
>> -----Original Message-----
>> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]
>> Sent: 17 July 2003 14:30
>> To: [EMAIL PROTECTED]
>> Subject: [ cf-dev ] Creating a random string
>>
>>
>> Does anyone have any code to hand that will create a random
>> string for the
>> use as an activation code which will be emailed to users when
>> they sign up
>> to my web site.
>>
>> Cheers,
>>
>> Chris
>>
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