How to convert and send joined or hexdecimal commands in C #

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I have a dot matrix printer to print and I need to send a cut command to the printer from a form (Windows Forms):

  • Through an interface I select the name of the printer.
  • I have a textbox which I input command in decimal to cut paper. For example: 27,109.0

    • The problem is that said command (27,109,0) and it was converted into hexadecimal like this: \ x1b \ x6D \ x0 through a function, but the problem is that it only works from code, I explain:

    Function Functional Print: 

        public void Imprimir()
    {
        string texto = "Prueba de impresion";
        texto += "\x1b\x6D\x0"; // funciona si solo excribo asi en una variable
        Imprimir(nombre_impresora, texto);
    }

    and when I try to call the conversion function the converted value comes out like this: \\ x1b \\ x6D \\ x0 with double bar. 

    public void Imprimir()
    {
        string texto = "Prueba de impresion";
        texto += ValorHexadecimal("27,191,0"); // retorna \x1b\x6D\x0
        Imprimir(nombre_impresora, texto);
    }

    does not work since it has a double bar

    conversion to hexadecimal function: 

    public static string ValorHexadecimal(string valor)
    {
        string hex = "";
        string[] valores = valor.Split(new string[] { "," }, System.StringSplitOptions.RemoveEmptyEntries);
        foreach (string c in valores)
        {
             System.Convert.ToString(int.Parse(c), 16).ToUpper();
             hex += @"\x"+ System.Convert.ToString(int.Parse(c), 16).ToUpper();;
        }

        return hex;
    }

    Now how to send decimal values read from a text to a port in hex or unicode:

    P.D. 1: Equivalences of VALUES:

    Decimal | Unicode | Hexadecimal

    27,109.0 | \ u001bm \ 0 | \ x1B \ x6D \ x00

    P.D. 2: The Print function is of the RawPrinterHelper class and works

        
    asked by Raúl 19.10.2018 в 22:37
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    1 answer

    0

    I'm going to split the answer into parts.

  • The function you have makes a textual representation of the hexadecimal value, but it does not return a hexadecimal as such. (if that existed).

  • What you need is a string that contains the characters represented by those values.

    For the latter, you can form an array of bytes and then code them in a character string, using ASCII or another encoder. In the case of ASCII, let's assume that you already have an array of bytes with the values {27,109,0} , the encoding It would be something like: 

    Byte[] buf = new byte[] {27, 109, 0};
string comando = System.Text.Encoding.ASCII.GetString(buf);
Imprimir(nombre_impresora, comando);

    The string comando has the characters represented by the decimal values 27, 109 and 0, which is what is sent to print.

    • What you would have left is to make a small routine that returns an array of bytes based on the text with decimals entered by the user.

        
    answered by 19.10.2018 в 23:00
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