topic Re: To make a string control in alphanumeric mode in LabVIEW

To make a string control in alphanumeric mode

L4U — Mon, 16 Jul 2007 04:54:41 GMT

Hi,

I'm trying to make a string control for sending commands to an instruments.

The instruments takes only alphanumeric character, So i want to create a string

control which accept alphanumeric(A-Z, a-z, 0-9) values only. How its possible in

labview, someone please help me.

With Regards

Re: To make a string control in alphanumeric mode

TCPlomp — Mon, 16 Jul 2007 05:39:49 GMT

Register for a 'key down?' event for that string control, and discard it if it is an invalid char:

Be aware, that 'shift' and 'enter' are discarded as well, this can be toggled by the outher case structure.

Ton

Message Edited by TonP on 07-16-2007 07:40 AM

Re: To make a string control in alphanumeric mode

altenbach — Mon, 16 Jul 2007 06:48:06 GMT

Instead of the big, complicated inner case structure in TonP's example, simply use the "lexical class" primitive from the comparison palette.

For example you could discard everything except lexical class 4 and 5. Adjust as needed.

Re: To make a string control in alphanumeric mode

tst — Mon, 16 Jul 2007 10:02:01 GMT

You can always trust Altenbach to notice those little used primitives.

Re: To make a string control in alphanumeric mode

Yi Y — Mon, 16 Jul 2007 23:22:39 GMT

Brilliant as usual, Altenbach! Thank you!

Yi Y.
Applications Engineer
http://www.ni.com/support