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("COM1", 9600, Parity.None, 8, StopBits.One);
port.Open();



// port.Write("He");

port.Close();
port.Open();
port.ReadTo("e");
Console.WriteLine(port.ReadLine());


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

[joedeene]

Is it possible to have a serialdatareceived 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.WriteLine(port.ReadExisting()); and in my console window m nog getting any out put;

2)even if i used
port.DataReceived += new SerialDataReceivedEventHandler(port_DataReceived);


private void port_DataReceived(object sender, SerialDataReceivedEventArgs e)
{
// Show all the incoming data in the port's buffer
Console.WriteLine(port.ReadExisting());
}
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("string")

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???which 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

[Plater]

What is attached on the COM port of the server computer? Are you using the corrrect baud rate? Are you using the correct COM port?

I am confused, your original post says you are doing this in ASP.NET, but you say you are in a console window?

[ravimishra11]

What is attached on the COM port of the server computer? Are you using the corrrect baud rate? Are you using the correct COM port?

I am confused, your original post says you are doing this in ASP.NET, but you say you are in a console window?

yes i am doing in console application .

[ravimishra11]

It is in Asp.net Console application.

[joedeene]

It is in Asp.net Console application.

An Asp.Net Console Application?! I've never heard of such, even googled it and nothing comes up relevant, how did you come about creating such, like what is some code from your asp.net console app? because it could just be a console app. Can you see it in your browser? Or just in a black standard console window...?

joedeene

[Curtis Rutland]

It is in Asp.net Console application.

ASP.NET is for website programming. ASP stands for Active Server Pages. I think you might mean .NET Console Application.

ASP.NET Console makes no sense.