How to add new data and delete old data from a custom text file?

Hi guys!

Well, I'm in a bit of trouble.

I need to make a request to some GPS tools. Split data in indicators, generate coordinates (google maps format), and so it goes.

One of the functions of the systems is the calculation of oscillation of coordinates. The formula should be: latitude 1 - latitude 2 = latitude AND longitude 1 - 2 = swing longitude longitude oscillation.

Since I'm on two values, I thought: "Oh, if I connect these data in a file, I just pick up and do all the calculations part." Yes, this idea is adapted to my needs (even if it is not the best, the computer part solved my problem).

BUT I don't see a way to write the current value of the loop and erase the old results.

For example, suppose that loop 1 gave me 1.00000, 2,00000 coordinates and loop 2 gave me the coordinates 3.00000 and 4.00000. Right?

My log file is similar to: 1.00000,2.00000; 3.00000,4.00000;

Well, it works. However, we will look forward to loop 3: coordinates 5.00000,6.00000.

If the program connects to it, I would get the chain: 1.00000,2.00000; 5.00000,6.00000; When I really need 3.00000,4.00000; 5.00000,6.00000;.

For this reason, when I apply the calculation of oscillation, it will always take the most recent value and do all the calculations with the first result (from loop 1).

Well, I wonder that there is a way to add new data to a file and replace the old values, with simple code. If anyone knows how, please respond here!

Considerations:

(1) I want to do it as simple as possible. My code is kind of great, and it is not appropriate to insert structures or library now.

(2) maybe the explanation is not as simple as it is for me. Really, I couldn't find a better way to say what I need.

(3) if someone has doubts as to my doubts, please just comment and I'll try to be as specific as possible.

Thanks in advance!

I guess my question is why write a file just to delete.

If you pass an array of points from one iteration to another, you will have to take extra time to open the file, read the file, delete the old data, writing the new data, save the file, and then close the file.  It would be pretty much the same thing, but without having to go through the hard drive.

Just a thought.

Tags: NI Software

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