topic Re: single ASCII char to byte in LabVIEW

single ASCII char to byte

jspaarg — Wed, 19 Jul 2006 12:48:50 GMT

Is there a straight-forward way to convert a single ASCII char to a byte.

I know that I can convert a string to an array of bytes.

In text-based code, I would simply AND the char with 0x0f, but the booleans do not allow string inputs.

I am sure that this has been asked before, but I just spent about ten minutes and couldn't find a directly related thread.

Any ideas are appreciated.

Re: single ASCII char to byte

becktho — Wed, 19 Jul 2006 13:09:03 GMT

This should work.

Re: single ASCII char to byte

jspaarg — Wed, 19 Jul 2006 13:25:47 GMT

Thanks for the try, but I am still in the dark ages of 7.1.

I should probably mention that on all future posts.

The way that I do it right now is just use the string conversion of decimal string to number for just one character.

Is that the best way?

Perhaps it is my old "cycle counting dinosaur" mentality, but that just seems inefficient for a single byte.

Thanks again.

Re: single ASCII char to byte

becktho — Wed, 19 Jul 2006 13:29:52 GMT

No problem - so a picture should help you..

Message Edited by becktho on 07-19-2006 03:30 PM

Re: single ASCII char to byte

jspaarg — Wed, 19 Jul 2006 13:56:59 GMT

When I run the cast with a string constant of "5", the output is 53.

When I run a string conversion, I get 5.

They both consistently take about 120 ms for 1,000,000 conversions.

Any idea why the incorrect value?

Re: single ASCII char to byte

jspaarg — Wed, 19 Jul 2006 14:01:02 GMT

Duh

The cast is to the numeric value (0x35, 35d) not the value represented by the ASCII char.

I guess I will stick with the string conversion.

Thanks

Re: single ASCII char to byte

becktho — Wed, 19 Jul 2006 14:01:39 GMT

The cast operation provided above gives you the ascii-code of the character. So "53" for string 5 is correct (char 5 = 0x35 = 53d).

The conversion just converts the string to a number. This means instead of a string you now have a numeric value with the same value.

Re: single ASCII char to byte

becktho — Wed, 19 Jul 2006 14:03:54 GMT

Sorry - I misunderstood your first post obviously. If you just want a numeric value instead of a string, the conversion function is the way to go. There is not really an alternative to that.