Doing the same thing for every line in a text file

Question

I am making an console application for a 3D CAD program called Soplid Edge. With this application i let Visul Basic draw curves and lines in Solid Edge. To make the curves i calculate points, what get stored into an array, with an 4th degree equation. Now the problem. I read my data from a text file. But this text file has srveral lines for different curves. And my code read trough them all and takes the last line what has data in it. My question: How can i let my piece of code read the first line, calculate the points, make the curve and then does the same thing with the next line with data.

Here is my code that i want to get repeated for every line in my text file:

    'Dmax(Array)
    Dim listofdata As New ArrayList
    For x = (0.2 * QT) To ((QFACTOR + 0.1) * QT) Step (0.1 * QT)
        listofdata.Add(x)
        y = (((x ^ 4) * C1) + ((x ^ 3) * C2) + ((x ^ 2) * C3) + (x * C4) + C5)
        listofdata.Add(y)
    Next
    Dim dataArray() As Double
    dataArray = DirectCast(listofdata.ToArray(GetType(Double)), Double())

            ' Creating a Curve2d object by using the above defined points
    objCurves.AddByPoints(PointCount:=14, Points:=dataArray)

And this is how i read my file:

Console.Write("Path to file:")
Dim strFileName As String
strFileName = Console.ReadLine
Dim objFS As New FileStream(strFileName, FileMode.Open, FileAccess.Read)
Dim objSR As New StreamReader(objFS)

score 0 · Accepted Answer · answered Nov 27 '12 at 09:14

0

With .Net Framework 4.x you can use ReadLines
http://msdn.microsoft.com/en-us/library/dd383503.aspx

    For Each line In IO.File.ReadLines(filename)
        ' do something with the string
    Next

ReadLines is an IEnumerable of String, which means that it will read one line after the other. If you use a version where this is not available, you simply replace it with ReadAllLines. ReadAllLines will read all lines at once into an array and then you are iterating over this array. If your file is small there is not much difference between both versions, but if you work with larger files, the first one has a smaller memory footprint and processing starts after reading the first and not when all lines have been read.

answered Nov 27 '12 at 09:14

igrimpe

1,775
11
12

Okay thank you! I am working with visual basic 2003, but i am gonna try to ghet IT to instal a 2010 express edition. I will see what will works best. – Nov 27 '12 at 09:19
Okay, i talked to IT and they can't install an newer version or an express version. And i looked up Readalllines it says it is supported from .NET 2.0 and mine .NET is 1.1. Any ideas how i can do this in .NET 1.1 ? – Nov 28 '12 at 07:34
1

1.1 ... VERY old ;) Check the StreamReader and `.ReadLine`. Sample from MSDN here: http://msdn.microsoft.com/en-us/library/db5x7c0d(v=vs.71).aspx – igrimpe Nov 28 '12 at 08:05

Doing the same thing for every line in a text file

1 Answers1