Overwriting a file in Labview 8.2

[Nallez]

Hi!

I have been browsing tons of same kind of situations, which none point at LV 8.2
I cant seem to find any of those files that they say to use to solve this dilemma.
so, here i go:

I try to write a data array to file. it goes there ok.
When i try to write again, it appends it to the next free line and doesnt overwrite the old data.

What should i do?

Yours Truly,
Tomi Nurminen

[PelleS]

Hi Nallez,

Which function do you want to use? In which format do you want to save your data? Don't you want to append data after each loop or after each run of your vi?

Best regards,

[GerdW]

Hi Tomi,

there's a function called 'Set File position' (or similar, don't have LV8+ at hand). You can set the position of the next file access (read or write). So just set to 0 to overwrite the file.
Other option: delete the file before writing to it. (You can also check for presence and delete if necessary.)

[Nallez]

It's writing a string with tons of Comma Delimiters and EOL's depending on arraysize.

The reason i'm not using Write to spreadsheet file, is because it makes leftover Commas to those lines, which have fewer items than the arrays max size.

[PelleS]

You may want to refer to your file in slightly different manner in order to gain more control of the writing. Please see for example Write to text file.vi.

I've also made a screenshot of that example which I've modified.

Does it help?

[Nallez]

Yep i tried that allready, but it didnt fix the problem.

[Nallez]

problem found. thx all for help!