确定（启用USB）消费者显示器的COM端口

Question

我已将客户显示器与POS应用程序连接起来。我正在使用串行端口类在客户显示器上显示消息。要发送消息，我需要使用com端口了解此USB显示器正在使用。我搜索允许有很多例子，让所有的comump壶，但我能够找到任何帮助，以获得微小的COM端口号，例如COM93，COM01或COM2。

我试过下面的程序，我也试过微软程序的WMI代码的创建者。

//获取串口名称列表。 string [] ports = SerialPort.GetPortNames（）;

Console.WriteLine("The following serial ports were found:"); 

    // Display each port name to the console. 
    foreach (string port in ports) 
    { 
     Console.WriteLine(port); 
    } 

Console.ReadLine(); 





     SerialPort sp = new SerialPort(); 
     sp.PortName = "COM93";------------- How i can find this no automatic 
     sp.BaudRate = 9600; 
     sp.Parity = Parity.None; 
     sp.DataBits = 8; 
     sp.StopBits = StopBits.One; 
     sp.Open(); 
     sp.Write("\f"); 
     sp.WriteLine("***Velkommen***"); 
     sp.Close(); 
     sp.Dispose(); 
     sp = null; 

我曾尝试以下解决方案为好，用这个也为了这个，我得到Access denied，所以我需要编辑registory给我点瓦纳做我想做的解决方案编程

ManagementObjectSearcher搜索权= new ManagementObjectSearcher（“root \ WMI”，“SELECT * FROM MSSerial_PortName”）;

Answer 1

public string Get_RegistryInfo(string VID, string PID) 
     { 
      try 
      { 
       RegistryKey rk1 = Registry.LocalMachine; 
       // HKEY_LOCAL_MACHINE 
       RegistryKey rk2 = rk1.OpenSubKey("HARDWARE\\\\DEVICEMAP\\\\SERIALCOMM"); 
       // HKEY_LOCAL_MACHINE\HARDWARE\\\\DEVICEMAP\\\\SERIALCOMM 
       VendorID = VID; 
       ProduktID = PID; 
       string pattern = string.Format("^VID_{0}.PID_{1}", VID, PID); 
       Regex _rx = new Regex(pattern, RegexOptions.IgnoreCase); 
       string rk2_SubKeyNames = null; 
       foreach (string rk2_SubKeyNames_loopVariable in rk2.GetValueNames()) 
       { 
        rk2_SubKeyNames = rk2_SubKeyNames_loopVariable; 
        if (rk2_SubKeyNames == "\\Device\\ProlificSerial0") 
        { 
         COM_Port = rk2.GetValue(rk2_SubKeyNames).ToString();       
        } 
       } 
       return COM_Port; 
      } 
      catch(Exception ex) 
      { 
       MessageBox.Show(ex.Message); 
       return COM_Port; 
      } 

     }