on 4/6/02 10:01 pm, J. Landman Gay at [EMAIL PROTECTED] wrote: > There are some exceptions -- characters that cannot be typed and which a > user can't enter into the text. I usually use numToChar(8) as a > delimiter, because that's the Delete key -- and it is impossible for a > user to type a delete character into the text. Another one I like is > numToChar(3), which is the Enter key character, which also cannot be > placed into the text. I've had good success using both of these. Someone
Warning: "impossible to type" is something you can securely guarantee only if you don't allow pasting. Never worked out how exactly it happened, but over many years of using HyperCard in lots of projects, we did occasionally get problems which came down to users having entered text which accidentally included 127 (the other delete) - which similarly you'd think would be impossible to enter. Different clients, on different projects, using different stacks. My assumption is that they must have pasted text in containing the dodgy character - at which point the question of what they'd originally used to generate that text opens very wide. (My guess would be a dodgy version of Word, possibly on Windows.) I can only type a very limited set of characters into this email client - but I can paste every character from 0 to 255 inclusive. If you want to be really really really sure, you have to test input and be prepared to do something with it. (Of course I'm just being picky; it may not be worth going to this level for your particular app. Depends how badly it would mess you up if by some chance the user did accidentally insert the character.) This is also when a universally visible character comes in handy. The problem with some of the whackier ones including 0 and 127 is that in many fonts they don't show up - so the users can't see that they've entered it. Ben Rubinstein | Email: [EMAIL PROTECTED] Cognitive Applications Ltd | Phone: +44 (0)1273-821600 http://www.cogapp.com | Fax : +44 (0)1273-728866 _______________________________________________ use-revolution mailing list [EMAIL PROTECTED] http://lists.runrev.com/mailman/listinfo/use-revolution
