Read/ write string to com port

[ravimishra11]

Hi friends,

I have written code in asp.net to read or write string in com port(COM1).But when i run the program i am not getting any output .Below is my code .How can i check the string which i have send in com port is available in com port for read.

private SerialPort port = new SerialPort("COM 1", 9600, Parity.None, 8, StopBits.One);
port.Open();



// port.Write("He" );

port.Close();
port.Open();
port.ReadTo("e" );
Console.WriteLi ne(port.ReadLin e());


please reply as soon as possible....... ............... ...Thanx in advance for reply...

[joedeene]

Is it possible to have a serialdatarecei ved args, with the handles in asp.net? If so, try that, maybe its not receiving it yet. You can always look up examples on google.


ex of the data received handler:

Private Sub port_DataReceived(ByVal sender As Object, ByVal e As _
       System.IO.Ports.SerialDataReceivedEventArgs) Handles port.DataReceived
 
       End If
    End Sub

joedeene

[Plater]

How do you know it is not working?
You know that code will be run on the server's COM port and not on the computer viewing the webpage right?

[ravimishra11]

because after port.write statement i have written

Console.WriteLi ne(port.ReadExi sting()); and in my console window m nog getting any out put;

2)even if i used
port.DataReceiv ed += new SerialDataRecei vedEventHandler (port_DataRecei ved);


private void port_DataReceiv ed(object sender, SerialDataRecei vedEventArgs e)
{
// Show all the incoming data in the port's buffer
Console.WriteLi ne(port.ReadExi sting());
}
this handle does not fire;


Thanx for reply .if you can provide more solution i am waiting to ur suggestion.

[Plater]

In your example code you call a Close() and then an Open(), why? The data could come in durring that time and you would never see it?
Are you making sure there is no flowcontrol enabled for the port (or enabled if you need to use it)

[ravimishra11]

Because first open port and i am writing the string to send to port like
port.write("str ing")

after writing string i am closing port as suggested somewhere in google.

then i am opening the port and reading the data.

actually i followed this link here is code for that:
http://msmvps.com/blogs/coad/archive.../23/39466.aspx

[Plater]

Well that is a bad practice, and nowhere in the article's sample code did I see where it said to close and then open.
You should close the object when you are done with it, if it is not open, how do you expect to receive data?

[ravimishra11]

Can u give me any solution???whic h is good

[Plater]

Well for testing purposes, try this:

private SerialPort port = new SerialPort("COM1", 9600, Parity.None, 8, StopBits.One);
 
port.Open();
port.Write("He");
string firstread=port.ReadTo("e");
System.Threading.Thread.Sleep(100);//pause for 1/10 a second
Console.WriteLine(port.ReadLine());
port.Close();
 

[ravimishra11]

Hi,
I did same as u send but still in console window i am not able to see any thing.
is there any other thing,that i need to set in computer