Method Similar to Readline () for Windows Form?

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Method Similar to Readline () for Windows Form?

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#1 by (1 votes)

1

I want to pass a small program that I have created in Console which takes the string that a USB device sends and sends it via TCP to an IP and a specific port. Right now I pass the received chain to a string and treat it a posteriori but ... What function / method do I have to use to capture what I receive via USB?

It is not clear to me what would be the best way to do it ... I have the following ...

    private void btnConectar_Click(object sender, EventArgs e)
         {
                ActualizarStatus();
             try
            {
                envio.Connect(IPAddress.Parse(tbIP.Text), tbPuerto));
                ActualizarStatus();
                btnConectar.Enabled = false;

                while (true)
                {
                    Enviar(cadena);                
                }
            catch (Exception error)
            {
                 ActualizarStatus(error.Message);
            }


    public void Enviar(string cadena)
         {
             ActualizarStatus();
             /////////////////////////////////////
             byte[] mensaje = Encoding.Default.GetBytes(cadena);
             try
                {
                    int bytesSent = envio.Send(mensaje);
                    ActualizarStatus();
                }
                catch (Exception error)
                {
                    ActualizarStatus(error.Message);
                }
          }

If you notice, being inside the method Enviar() I need to stay waiting on the line where I have the ////////////////// to the USB buffer is filled, Once you have as you say the car return, I would continue with the following line, which prepares me the string cadena to send it right after. The problem I have is that I do not know how to do it in a way that is not a fudge. The truth is that in console with a simple Console.ReadLine () solved everything ...

P.D: I have omitted part of the code because it is irrelevant so that it is not heavy.

Thanks

c#

asked by Edulon 11.10.2017 в 12:44

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1 answer

Enter values within Variable python Error in Xamarin Forms Timeout exceeded getting exception details

score 1 · Accepted Answer

I do not have a barcode reader right now, but basically they are exactly like a keyboard. What I would do is the following:

In the form, put the property KeyPreview to true

In the event handler KeyPress we are adding the characters to a variable of type string .

The end of the bar code must be detected. This is normally configurable in the reader, but it is usually a carriage return. At the moment that the carriage return is detected, you should call the function that treats the barcode.

string cadena = "";

private void Form1_KeyPress(object sender, KeyPressEventArgs e)
{
    if (char.IsLetter(e.KeyChar) || char.IsDigit(e.KeyChar))
    {
        cadena += e.KeyChar;
    }
    else
    {
        if (e.KeyChar == (char)13)
        {
            Enviar(cadena); //Como se llame tu método de procesado
            cadena = "";
        }
    }

}