如何在命令行的 telnet 窗口上读取输入和写入输出？

Question

我想在我的设备扫描条形码时从命令行接收输入，并将条形码相关信息提供给 telnet 窗口上的命令行，我们从“telnet 192.168.xx 23”和之后通过 cmd.exe 登录 telnet 服务器开始在 cmd 中输入此命令，然后登录 succsessfull telnet 窗口打开并且我的机器连接到设备，现在我必须从此窗口读取条形码字符串并显示与该字符串相关的输出。请告诉我如何做到这一点？

这是我的代码，只需手动输入输入字符串，然后按回车即可输出。

namespace ConsoleApplication2
{
    class Program
    {
    private static System.Timers.Timer aTimer;
    string path = @"C:\Users\Priya\Desktop\Project\barcode.txt";

    SqlConnection con = new SqlConnection(System.Configuration.ConfigurationManager.ConnectionStrings["SaiNathHospital"].ToString());

    public void getConsoleInput()
    {
        try
        {
            FileInfo fi = new FileInfo(path);

            for (int i = 0; i <= 0; i++)
            {
                Console.WriteLine("");
                using (StreamWriter sw = new StreamWriter(path))
                {
                    sw.WriteLine(Console.ReadLine());
                    sw.Close();
                }
            }
        }
        catch (Exception e)
        {
            Console.WriteLine(e.Message);
        }
    }

    public void getConsoleInputAtRuntime()
    {

    }

    public void ReadWriteIntoFile()
    {
        try
        {
            string filename = @"C:\Users\Priya\Desktop\Project\Data.txt";
            StringBuilder sb = new StringBuilder();

            StreamReader sr = new StreamReader(path);
            string s = sr.ReadLine();
            sr.Close();

            DataExport("Select * from PATIENT_TABLE where [BARCODE] = '" + s + "'", filename);
        }
        catch { }
    }

    public void DataExport(string SelectQuery, string filename)
    {
        try
        {
            using (var dt = new DataTable())
            {
                using (var da = new SqlDataAdapter(SelectQuery, con))
                {
                    da.Fill(dt);
                    var rows =
                        from dr in dt.Rows.Cast<DataRow>()
                        select String.Join(
                            ",",
                            from dc in dt.Columns.Cast<DataColumn>()
                            let t1 = Convert.IsDBNull(dr[dc]) ? "" : dr[dc].ToString()
                            let t2 = t1.Contains(",") ? String.Format("\"{0}\"", t1) : t1
                            select t2);

                    using (var sw = new StreamWriter(filename))
                    {
                        // sw.WriteLine(header);
                        foreach (var row in rows)
                        {
                            sw.WriteLine(row);
                        }
                        sw.Close();
                    }
                }
            }
        }
        catch (Exception e) { Console.WriteLine(e.Message); }
    }

    public void WriteFileOutput()
    {
        string path = @"C:\Users\Priya\Desktop\Project\Data.txt";
        if (File.Exists(path))
        {
            string[] lines = File.ReadAllLines(path);

            foreach (string line in lines)
            {
                Console.WriteLine(line);
            }
        }
        Console.ReadLine();
    }

    public void  timer()
        {
            aTimer = new System.Timers.Timer();

            aTimer.Elapsed += new ElapsedEventHandler(OnTimedEvent);
            aTimer.Interval = 10000;
            aTimer.Enabled = true;

            Console.WriteLine("Press the Enter key to exit the program.\n");
            Console.ReadLine();
        }

    private static void OnTimedEvent(object source, ElapsedEventArgs e)
        {
            //System.Windows.Forms.SendKeys.Send("{ENTER}");
            Console.WriteLine("5 seconds Elapsed at {0} ", e.SignalTime); // for your reference to check every five seconds
        }

    public static void Main(string[] args)
    {             
      Program p = new Program();     
      p.getConsoleInput();
      p.ReadWriteIntoFile();
      p.WriteFileOutput();
    }   
}

}

Answer 1

普里扬卡，欢迎来到 SO。我对此采取的方法是以编程方式发出 telnet 并等待来自 telnet 的响应。现在既然，你正在登录 ConsoleApplication2 不知道会话。

所以，这是解决方案的高级方法

1. 启动您的 ConsoleApplication2 应用程序
2. 使用 Telnet 库打开与设备的连接
3. 使用同一个库从 Telnet 读取扫描响应
4. 对响应执行数据库操作。

如果您有 Telnet 库，问题会变得更简单。但是，SO 中有一个类似的问题，这里推荐了一个库 - Executing commands by using Telnet in C#

希望这会有所帮助！