Limit digits on number entry

[LarsUlrich]

I am in the process of writing a driver for some hardware and I am not sure how to do something.

There is a timing parameter that can a adjust a couple of different things, and the format of the string commnd looks like RDVALXXXXYY.

The string is build with 3 user controls, one is a menu ring that picks the "RDVAL" out of a list, the next one is a number control that has to be 4 digits long (no more, no less) and the last one is another number control that needs to be 2 digits long, no more, no less.

I could just make instructions that describes the fact that the numbers have to be a certain length, but I need a way to require the numerical control to only accept a 4 digit number (and a 2 digit number in the other case).

[ben64 · Accepted solution]

Configure your numeric controls as follow:

  this max number is FFFF

Do something similar for the 2 digits input

Ben64

[LarsUlrich]

Thanks for the tip, will that prevent it from being more than 4 digits though?  That looks like it only prevents it from being under 4 digits.

[LarsUlrich]

woops my bad, the rest of your post must not have loaded when I posted a reply.

[ben64]

The max value is wrong in my post, here are the settings you should use.  Ben64

[LarsUlrich]

Hmmm, the max number has me a little confused.  If I don't want it to be more than 4 digits, shouldn't it be 9999?   Unless I am misunderstanding what the "max value" is...

[RavensFan]

Do you want a 4 digit decimal string or a 4 digit hexadecimal string?  All the earlier posts were working in hexadecimal.  The max 4digit value would be FFFF which is 65535.  For a max 4 digit value in decimal, then it would be 9999.