Hello All,

I am working with a program the reads data from a file and plots it to a graph in real time. My stream is coming from a microcontroller output and I am building an interface to display the data. I am using stream reader in my routine, but I have a problem.

What I want to do is to get one line, plot it, and the get the next line inside a method. Can you please direct me as to what to use to do this. I am new to C# and I think stream reader is the best way to do this. I just need a way of being able to read new points as they come.

Thanks'

private void timer1_Tick( object sender, EventArgs e )

if ( curve == null )
return;

 IPointListEdit list = curve.Points as IPointListEdit;

 if (list == null)
   return;

double time = (Environment.TickCount - tickStart) / 1000.0;
try
 {
 //PROBLEM (NEED TO READ ONE LINE THIS TIME AND THE NEXT LINE IN THE NEXT CALL
StreamReader sr = new StreamReader("TestFile.txt");
String line;     
line = sr.ReadLine();
 double value = double.Parse(line);
 list.Add(time, value);
    }
 }
 catch (Exception err)
  {
  MessageBox.Show(err.Message);
}
          
//graphing code
}

Declare a global integer variable index=0
in timer tick write this code

/*Your code */
index++;
int i=0;
String line; 

try
 {
 //PROBLEM (NEED TO READ ONE LINE THIS TIME AND THE NEXT LINE IN THE NEXT CALL
StreamReader sr = new StreamReader("TestFile.txt");
while ((line = sr.ReadLine()) != null && i<= index)
{
if(i==index)
{
double value = double.Parse(line);
list.Add(time, value);
}
else i++;
    }
sr.Close();
 }
 catch (Exception err)
  {
  MessageBox.Show(err.Message);
}

Use this Code this will help you

This will read lines and get new ones that are added to the file as they are added. You'll have to come up with a way to end the loop though :)

FileStream ins = File.Open(@"d:\test.txt", FileMode.Open, FileAccess.Read, FileShare.ReadWrite);
StreamReader sr = new StreamReader(ins);
String line;

while (true) {
                
    if (sr.EndOfStream == false) {
        line = sr.ReadLine();
        if (!String.IsNullOrEmpty(line)) {
            Console.WriteLine(line);
        }
    }
}

Depending on the speed of the writes to the file, you may have issues with partial lines. Flush after every write.