PARSING

[darnell]

HI is any suggestion or any site on parsing tex files.

Im just trying to parse

 CHILLER 22

[menchar]

For reading text files I usually use the regular expression functions in CVI.

You can use RE's to search the text file for items of interest.  The NI RE implementation is not particularly good - it won't parse past a linefeed as I recall.

You may be able to find an RE library in C on the web that does a better job than CVI.

Menchar

[darnell]

What are RE's?

[RobertoBozzolo]

RE = Regular Expression. The CVI instrument for using regula expressions can be found in toolslib\toolbox folder (regexpr.fp).

[darnell]

is there an example in cvi to loop at , where in the are are opening text files and parsing them.

or if you have an example can you send it to me.

i just need some where to start. 

[Al_S]

If your parsing needs are that simple, you can just use the ANSI C sscanf() function.  sscanf() returns the number of items found, so you can use that return value for a simple error check.

char command[256];

int parameter, items;

char cmd_line[] = "CHILLER 22";  // real program will get this string from somewhere else

// read the command, expecting 2 items 

items = sscanf(cmd_line, "%s%d", command, &parameter);

if (items != 2)

  printf("Syntax error in line %s\n", cmd_line);

Your last question on reading from a file is starting to duplicate your post here: http://forums.ni.com/ni/board/message?board.id=180&message.id=42661&jump=true

Message Edited by Al S on 08-26-2009 02:06 PM

[darnell]

thats what im doing uing it for a real world code. because im going to call the text file in to a text executive to lunch my gui.

[dummy_decoy]

i would eventually suggest to first define exactly what the syntax of your file will be. then document this syntax: do a search for BNF and try to express your syntax using this notation. during this process, you may encounter some problems which will force you to refine your syntax. once this is done, it is very easy to convert your BNF syntax into a parser, using either RE or a hand written parser or any other tool (there exists some parser generator software which output C code for a BNF input syntax).

[darnell]

WHAT IS RE AND HOW DO YOU GET TO IT

[darnell]

ok i got the program to work, where it will interpret the text file. now my question is how can i get the that text file associate with the ini file.

because what is going to happen i have program that has a gui and it speaks to a device. what i want to do is have that text file lauching the same gui i have.

because the engineer wants to be able to edit the temperature from the text file. so how can i make that happen. what will be my starting point.

im going to post my project soyou can see what im talking about