writing unique record to file

[tomsch1]

is there a simple way to only record unique records??

i have a master list of items and only want to append new items to the list.

[BJD1613]

If you mean a complex datatype when you say unique record you can use the datalog file type (.dat) to write a cluster of info to a file. THis will be stored as records in a binary format. Try looking at the datalog file type examples in LV. Hope this helps.

[andre@carya]

Hello,

The way would do it is ...

Read the file, check if the records exixts, if not append it to the end.

André
"tomsch1" schreef in bericht
news:5065000000080000009FBE0000-1075935269000@exchange.ni.com...
> is there a simple way to only record unique records??
>
> i have a master list of items and only want to append new items to the
> list.

[tomsch1]

it doesn't seem that simple as i can't get it to work.

i am forced into loading the file into an array, and then check multiple strings to see if they exist.

i am obviosly not seeing something

an example of reading a log file and writing to an existing log file only the unique lines may assist me in understanding what i'm doing wrong

[Chris_de]

Hi tomsch1,

look at the example, i hope it does the thing you want to do.

Chris

[matthias.richwin]

Hi,

try the Configuration File vi's (a subpalette of File I/O). They support a "unique key" / value structure as in typical windows .ini files. You would only have to convert your data into a string which can be saved as the value in the file. The data can also be saved in different sections, thus keeping different sets of key/value pairs in the same file.

Matthias