我有一个RFID设备通过端口COM1连接到我的笔记本电脑(确认正确,我使用设备管理器).但是,当我用C#语言运行这些代码时.它给了我一个异常访问端口"COM1"被拒绝.有人可以帮我解决这个问题吗?以下是我的代码.
using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Net; using System.Net.Sockets; using System.IO.Ports; using System.Threading; namespace Testing1 { public class Testing1 { public static SerialPort iSerialPort = new SerialPort(); static int Main() { string strException = string.Empty; string strComPort = "COM1"; int nBaudrate=Convert.ToInt32(9600); int nRet = OpenCom(strComPort, nBaudrate, out strException); if (nRet != 0) { string strLog = "Connect reader failed, due to: " + strException; Console.WriteLine(strLog); //return; } else { string strLog = "Reader connected " + strComPort + "@" + nBaudrate.ToString(); Console.WriteLine(strLog); } Console.WriteLine("Press any key to exit."); Console.ReadKey(); iSerialPort.Close(); return 0; } public static int OpenCom(string strPort, int nBaudrate, out string strException) { strException = string.Empty; if (iSerialPort.IsOpen) { iSerialPort.Close(); } try { iSerialPort.PortName = strPort; iSerialPort.BaudRate = nBaudrate; iSerialPort.ReadTimeout = 200; iSerialPort.DataBits = 8; iSerialPort.Parity = Parity.None; iSerialPort.StopBits = StopBits.One; iSerialPort.Open(); } catch (System.Exception ex) { strException = ex.Message; return -1; } return 0; } } }
Ove.. 8
当某些其他程序正在访问COM1端口时,可能会发生此异常.你还有其他使用RFID设备的程序吗?
您可以使用Portmon检查哪些程序使用哪些端口.