Scan chain with variable elements of number?

Hi all

I wonder what would be a good way to parse a string containing a variable number of items to search for. I've seen comments of Roberto on the scan function that are very useful (link1, Link2).

The string type, I would be sweeping would be "5 2.6 4.7 5.01 7.1 4.03" with 5 specifying that will follow 5 double rooms, delimited by spaces.

Thanks in advance!

Scan of the CVI function is very powerful, with many options and features, but it has some limitations.

For example, the ability to scan several parameters in a table as Roberto watch is very slippery, but I can't find a way so he can tell me how many items have been scanned.  Scan returns the number of items formatted, but apparently, it counts a table as a single item.  You can check that by checking the return value of scanning in the message of Roberto.

I tend to fall back on many of the functions of the library of ANSI-C function strtok Norbert suggested.  You need more lines of code, because you load the element of a table at a time in a loop, but you can add more checking along the way of the errors.  You could do the same thing with the sweep, playback of a parameter at the same time and then jump the NumFmtdBytes() in the next reading.  But if I do not need the additional capacity a CVI library function, I use the ANSI C function.

It's just another way of seeing things.  strtok is not clearly better than Scan() in this case, it shows just another approach.  Each has its own advantages and disadvantages.

Take a look at the attached simple example.  It shows some of the audit that can be done, with examples of several types of possible errors of possible errors.

Tags: NI Software

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