How to read two files (one is updating every second, the other is constant) simoltaneously

Dear All,
I will appreciate if somebody help me.
I want to read two files, one is temperature wich is updating every second, and the other is hysteresis energy which has specific rows and is constant.
I got a program in discussion forum which read a file as it is updating. I checked this program in my case and it works.
Then I added reading hysteresis energy file to the existing file. But while i am running the program, the hysteresis energy file is read with all rows.
But the aim is that everytime which temperature updates, I need to read just one row of the hysteresis energy file.
so, in this way in every second i have a new temperature data and one row of the other file.
I tried to used "for loop" inside the program, but it did not work, becuase reading temperature will be stopped untill for loop ends.
I attached the program.
Could somebody help me how to read just one row of hysteresis energy file everytime temperature updates?
Solved!
Go to Solution.
Attachments:
Readfiles.vi ‏23 KB

I do not understand relationship between your two files.
You have another VI or app that is writing data to both files and when new temperature data added you wish just to read the new data and then read one new line of the hysteresis file?????
But is one is constant, why do you need to keep reading it?
Anyway…
The “Read From Spreadsheet File.vi” preformed an Open and a Close for each time it is called (if you will open the VI up and drill down and you will see). So that resets the file pointer back to the beginning and there for will read in the whole file from the first to the last each time if you do not set the start of read offset or number of rows.
Now the Read from Binary File does not reset the file pointer and leaves the file pointer just past the last byte read so it will start with any new bytes automaicly only giving you the new data.
I do not think you need to do the math with the Previous EOF=0 and the File size to get what I think you are trying to do.
Plus use shift reg for the Data string instead of local var
Set the mechinacl action of the stop botton to Latched
So you do not need to init the two controls
Also, I do not get the End of file encountered error (4) from the Read from Binary file if I attempt to read past. It just returns and empty string.
Omar
Attachments:
Readfiles.vi ‏22 KB

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