Help creating a string of byte data

[russelldav]

I have some data in my VI in numeric form that I need to convert into a string in order to send it across my network by UDP.

Can someone show me how to do this?

I tried (see attached) but I'm loosing precision in the conversion to a string.

I need to stick to the following specs for my parameters

Parameter	Units	Type	Size (bytes)
Index	none	Integer	4
Lat	Radians	Double	8
Long	Radians	Double	8
Altitude	m	Float	4
Heading	Radians	Float	4
Pitch	Radians	Float	4
Roll	Radians	Float	4
			4

Thanks

[RavensFan]

Try the typecast function to do the conversion to a string.

[russelldav]

Thanks!

[Dennis_Knutson]

And, it doesn't look like you are following the format you provided. It would seem you are converting everything to an array of U16s (two bytes).

[russelldav]

One quick query...

I tried the type cast and it seems to convert the number to a string ok, but not as I expected.

For example (see attached), when I set the "Entity Index" to 97 I would expect to see the ascii chacater that represents the binary 1100001 i.e. "a". but instead I get "BÂ"??

I always need my string length for each paramater to be either 4 or 8 bytes long, as described in the spec above.

[Dennis_Knutson]

Well, now instead of U16 for everything, you've changed to SGL and DBL. SGL are 32 bit numbers (4 bytes) and DBL are 64 bit (8 bytes). You need to use the correct data types to begin with or use the convert functions before using the typecast.

[russelldav]

Of course, sorry! Silly (embarassing) mistake

[altenbach]

OK, here's the easy way (LabVIEW 8.0):

Sender: Make a cluster of your data, cast it to a string.
Receiver: cast it back to a cluster of the same type.

Couldn't be simpler! 😄 You don't even need to worry about sizes, etc.

Message Edited by altenbach on 04-12-2008 09:04 AM