C#获取当前连接设备串口号

方案一： string[] ports = SerialPort.GetPortNames();
会把鼠标键盘等其他不想获取到的串口也一并获取到
方案二：调用API，获取设备管理器下串口序列名称，可以自定义筛选。但是存在BUG，列如某个产品在设备管理器中连接后为STMicroelectronics Virtual COM Port，正常是STMicroelectronics Virtual COM Port（COMX）.出现这种情况这种方法就不行了
ManagementObjectSearcher searcher = new ManagementObjectSearcher(“select * from Win32_SerialPort Where Name like ‘%STMicroelectronics Virtual COM Port%’”);
var hardInfos = searcher.Get();
foreach (var hardInfo in hardInfos)
{
if (hardInfo.Properties[“Name”] != null)
{
if (strs.IndexOf(“STMicroelectronics Virtual COM Port”) > -1)
{
break;
}
strs = strs + hardInfo.Properties[“Name”].Value.ToString();
}
}
this.cobPorts.Items.Clear();
if (!string.IsNullOrEmpty(strs))
{
if (strs.IndexOf(“STMicroelectronics Virtual COM Port”) > -1)
{
string s = strs.Replace(“STMicroelectronics Virtual COM Port”, “”).Replace("(", “”).Replace(")", “”).Replace(" ", “”);
this.cobPorts.Items.Add(s);
if (cobPorts.Items.Count > 0)
{
this.cobPorts.SelectedIndex = 0;
}
}
}
方案三： 使用 SerialPort.GetPortNames()得到全部串口名称，并且逐个通信，通信OK则留下。也是我最终采取的方案
string[] ports = SerialPort.GetPortNames();
cobPorts.Items.Clear();
cobPorts.Text = null;
if (ports != null)
{
foreach (String sPort in ports)
{
if (sPort != null)
{
SerialPort spx = new SerialPort(sPort);
spx.Open();
bool com = false;
if (spx.IsOpen)
{
com = Communication(spx);
if (com == true)
{

                            cobPorts.Items.Add(sPort);
                        }
                    }
                    spx.Close();
                    
                }

            }
        }
        if (cobPorts.Items.Count > 0)
        {
            // cobPorts.SelectedIndex = cobPorts.Items.IndexOf(Properties.Settings.Default.BluePort);
            cobPorts.SelectedIndex = 0;
        }

private bool Communication(SerialPort sPort)
{
try
{
sPort.BaudRate = 256000;
sPort.Parity = Parity.None;
sPort.DataBits = 8;
sPort.StopBits = StopBits.One;
sPort.Handshake = Handshake.RequestToSend;

            sPort.ReceivedBytesThreshold = 1;
            Byte[] sendBuffer = new Byte[] { 0xFA, 0xF5, 0x7, 0x4, 0x1, 0xD8, 0x3C };
           // fm.slp.DiscardInBuffer();
            // slp.DiscardOutBuffer();
            int checkSum;
            checkSum = fm.short_Data2CRC16(sendBuffer, sendBuffer.Count() - 2);
            sendBuffer[5] = (Byte)(checkSum >> 8);
            sendBuffer[6] = (Byte)(checkSum & 0xFF);
            sPort.Write(sendBuffer, 0, sendBuffer.Count());
            byte[] rbuf;
                do
             {
            rbuf = new byte[sPort.BytesToRead];
            // Console.WriteLine(rbuf.Length);           
            sPort.DiscardOutBuffer();
              } while (rbuf.Length == 0);  //此处循环 否则slp.BytesToRead有时获取到的值是0   调试的时刻有看到有值 ，获取出来为0，原因不明，循环一下就可以获取到了

            sPort.Read(rbuf, 0, sPort.BytesToRead);
            string str = "";
            str = System.Text.Encoding.Default.GetString(rbuf);
            if (str != "")
            {
                return true;
            }
            else
            {
                return false;
            }
        }
        catch (Exception ex)
        {
            return false;
        }
    }