Question by EnderDragoon · Mar 19, 2015 at 12:16 PM · c#text file

Read last line of .txt file to float variables

I have a program that outputs a stream of variables in a txt file. I need to build an interface in Unity. Most other stuff I have well sorted out but breaking apart a large txt file in C# I haven't messed with. Most methods record the entire body of text to a variable, stream or array but I only need the last few lines. The text looks like t$$anonymous$$s:

  54.41316 |      54.90971 |      60.67264 |      60.67264 |      62.61755 |      69.82083 |      69.82083 |
  54.39159 |      54.88930 |      60.65312 |      60.65312 |      62.59273 |      69.79837 |      69.79837 |
  54.37241 |      54.86911 |      60.63384 |      60.63384 |      62.

You can see the last few numbers are missing on the last line because if the file is opened at an

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Eluate · Mar 19, 2015 at 10:15 AM 0

@EnderDragoon this may not be the most efficient way into what you are trying to achieve. Why not use JSON?

EnderDragoon · Mar 19, 2015 at 10:28 PM 0

Not familiar with JSON. I'll start reading about it. Does it have the capacity to do this? What's happening is X-Plane 10 outputs a Data.txt file that's updated several times per second with flight data. I'm attempting to build aircraft gauges (airspeed, altimeter, turn coordinator, etc) that read the txt file for the telemetry to animate the gauges. I can also output the data in a UDP stream to an IP address (which can be local host) but I have very little experience with network coding and interpreting a UDP stream.

Eluate · Mar 20, 2015 at 05:34 AM 0

If you are using a JSONObject library, you can access the JSONObject like an array, for example jsonObject[1].

spiceboy9994 · Mar 21, 2015 at 12:22 AM 0

In my experience Json objects are used for that exactly, for OBJECT representation. In your case, if you don't have any security restrictions, your txt file is just fine. However, I don't get the part where you mention "the last few lines"? you can get the last x numbers if you parse the file within a stream and by simple split, you can get the array:

 var var fileStream = new StreamReader("FILEPATH");
 string x = fileStream.ReadToEnd(); // suposing its the object with your file
 string[] fileLines = x.Split('|');
 //Now that you have the array you can access the data by index

 //Or you can find an especific object using linq if you need
 
 var matchingLines = fileLines.ToList().Where(l=> l.Contains("60.")).ToList();

Regards

BTW, you don't need the spacing on the txt (in case that it's something you control). You can have all the data trimmed, just ensure you have a delimitator.

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Read last line of .txt file to float variables

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