Add to start of existingfile by using entry for spreadsheet.vi?

I am trying to add at the beginning of a file using writing to the file of the spreadsheet with the position.vi set file. I'll be collecting digital data and then by calculating results calendar when you're done collecting. I do not have to pass all the digital data for the duration of the trial, but rather write it on occasion using writing to spreadsheet.vi. When you are finished add the results of timing at the beginning of the file. I can't make this work. Any suggestions? My first attempt was attached.

I ran into this too... the answer is, no, you can do so by using the "write to the spreadsheet" VI.  In fact, you cannot insert data into the beginning of a file at all without being cunning.

In my case, I wanted to add a header to my file after the data has been taken, because (due to the requirements of the customer), the header to contain both the start time AND duration of the end of the data.  Of course, I didn't end until after that time racing data were completed.  The end time must be on a separate line of the start time.

I found, after that some research on this forum (here), was that it was necessary for me to pre-allocate this line when I wrote my original (with some dummy data) header and then overwrite dummy at the end of the race by setting the mark file to 'start', then by writing a header of the same size , but with the correct data in it.  I could not simply insert it.

The link I've included gives as well a few other ideas for how you could do that, but you will probably need to write your own code to do.

Tags: NI Software

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