CODEWITHSUNDEEP
c#string
James Archer
James Archer

Reputation: 421

String manipulation of Serial Port data

I am working on creating a windows form application and I have come across a problem. I am reading data in from the serial port.

string RxString = serialPort1.ReadExisting();

This works fine but what I now want to do is extract values from my RxString and put them into their own string arrays.

This the RxString format: 

GPS:050.1347,N,00007.3612,WMAG:+231\r\n

it repeats itself as more data is added from the serial port the numbers change but stay the same length, and the + changes to -. I want to put the numbers between GPS: and ,N into one string array, the numbers between N, and ,W in another string array and finally the numbers between + and \r\n in a 3rd string array.

How would I go about doing this?

Upvotes: 1

Views: 1452

Answers (5)

d.moncada
d.moncada

Reputation: 17402

This is not the best solution since it uses "magic" numbers and substrings - but may work for your situation since you said the string length is always the same.

var serialPortInfo = "GPS:050.1347,N,00007.3612,WMAG:+231\r\n";

private List<string> value1 = new List<string>();
private List<string> value2 = new List<string>();
private List<string> value3 = new List<string>();

private void populateValues(string s)
{
    // this should give an array of the following: 
    // values[0] = "050.1347"
    // values[1] = "N"
    // values[2] = "00007.3612"
    // values[3] = "WMAG:+231"
    //
    var values = (s.Substring(4, (s.Length - 8))).Split(','); 

    // populate lists
    //
    value1.Add(values[0]);
    value2.Add(values[2]); 
    value3.Add(values[3].Substring(6, 3));
}

//usage
populateValues(serialPortInfo);

Upvotes: 0

Andre Calil
Andre Calil

Reputation: 7692

Ok, Regex solution:

        string pattern = @"^GPS:(?<gps>.{8}),N,(?<n>.{10}),WMAG:(\+|\-)(?<wmag>.{3})\\r\\n$";

        string gps = string.Empty;
        string n = string.Empty;
        string wmag = string.Empty;

        string input = @"GPS:050.1347,N,00007.3612,WMAG:+231\r\n";

        Regex regex = new Regex(pattern);

        if (regex.IsMatch(input))
        {
            Match match = regex.Match(input);

            foreach (Capture capture in match.Groups["gps"].Captures)
                gps = capture.Value;

            foreach (Capture capture in match.Groups["n"].Captures)
                n = capture.Value;

            foreach (Capture capture in match.Groups["wmag"].Captures)
                wmag = capture.Value;
        }

        Console.Write("GPS: ");
        Console.WriteLine(gps);

        Console.Write("N: ");
        Console.WriteLine(n);

        Console.Write("WMAG: ");
        Console.WriteLine(wmag);

        Console.ReadLine();

Upvotes: 3

Hossein Narimani Rad
Hossein Narimani Rad

Reputation: 32481

Try this:

string RxString = serialPort1.ReadExisting();

string latitude = RxString.Split(',')[0].Substring(4);
string longitude = RxString.Split(',')[2];
string mag = RxString.Split(',')[3].Substring(6).Trim();

Upvotes: 1

A K
A K

Reputation: 198

I'm sure there's some RegEx that could make this prettier, but I'm not great at regex so I'd checkout C#'s String.Split function. Substring would work if you know the numbers will be the same length, but if that's not a guarantee, Split would be your best bet. You could split each line on the comma, creating an array, then use Replace to remove the extra text (like GPS: and WMAG:), if you know that's going to be the same every time.

Upvotes: 0

Dude Pascalou
Dude Pascalou

Reputation: 3171

If the string is always the same length, the best way is to use substring() method.

Upvotes: 0

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