Convert a string to an array of character

[tbob]

I think I have an answer on speed issues. Martin's verion uses the String to Byte Array and Byte Array to String. These functions must go through every element of the array and do a conversion. Since there are two functions used, each element in the array must be accessed twice. Altenbach's version uses String to Byte Array, meaning each element is accessed once before the loop, then again when the loop is encountered. Again, each element is accessed twice. Shoneill's version accesss the elements once during the loop, and that is it. In my opinion, Shoneill's version should be faster, although Altenbach's version looks easier. Since Altenbach's version is the slowest by far, I would guess that the type cast function is not very fast.

[Tijarmin]

Since I don't have very long string to convert, I'll opt for Altenbach's version, just because it involves less steps.
Thank you for your tests Shane.

Martin

[altenbach]

Martin,

For anything short, I would probably use my version too. 😉

Arrays of strings a just not the greatest way to shuffle things around in the code (remember, strings are stored as pointer to a structure that contains a 4 byte length value followed by an 1D array of byte integers, see application note 154). So each 1 character strings in your array occupies many bytes of rather useless information in this case (e.g. the completely redundant information that each element is length=1). 😞

IF you need to do computations on strings one character at a time, it is much better to keep everything at U8. You can do all the same things that you would do with "lenght=1 strings", but everything will be much more efficient. I don't know the purpose of your code, but that's something to keep in mind. 🙂

[chips]

Hi

I need exactly whats been discussed here. but i am unable to download any of the attachments. Can someone help please

Thanks

sarkar

[RavensFan]

See Problem with Attachments

[mikeporter]

Why do you need an array of individual characters? Typically who think they need that are actually needing something else.

Mike...

PS: You did notice of course that you appended your question to the end of a 6-year-old thread. That is not a way to be noticed. You are very lucky that you are getting any responses.

[chips]

Thanks for your reply. Didn't want to populate the forum with repeated questions. 

I actually wanted to convert each characters of the string to ascii and pass it to uart. I have used String to byte array function for the same. Was wondering if there is a direct function.

Regards

sarkar

[mikeporter]

How is the UART connected to your computer? Are you taking about a serial port on your computer?

Mike...

[chips]

I am using a DB9 connector to pass serial data between two PCs.

[mikeporter]

Ah, well you are over-thinking the problem. LV is a much more sophisticate language that incorprates serial drivers that handle all the data serialization and IO for you. Check out the serial IO examples that ship with LV and see if they get you pointed in the right direction.

Mike...