拒绝访问端口'COM5‘
拒绝访问端口'COM5‘
提问于 2012-09-30 07:42:46
在我的表单中运行下面的方法时，我得到了下面的错误消息Access to the port 'COM5' is denied.。我已尝试从设备管理器的端口设置中输入正确的波特率9600。我也尝试过通过Portmon访问这些设备，但有一个bug阻止了我的连接。有什么替代方案可以解决这个问题吗？
//Fields
List<string> myReceivedLines = new List<string>();
//subscriber method for the port.DataReceived Event
private void DataReceivedHandler(object sender, System.IO.Ports.SerialDataReceivedEventArgs e)
{
SerialPort sp = (SerialPort)sender;
while (sp.BytesToRead > 0)
{
try
{
myReceivedLines.Add(sp.ReadLine());
}
catch (TimeoutException)
{
break;
}
}
}
protected override void SolveInstance(IGH_DataAccess DA)
{
string selectedportname = default(string);
DA.GetData(1, ref selectedportname);
int selectedbaudrate = default(int);
DA.GetData(2, ref selectedbaudrate);
bool connecttodevice = default(bool);
DA.GetData(3, ref connecttodevice);
port.DtrEnable = true; //enables the Data Terminal Ready (DTR) signal during serial communication (Handshaking)
port.Open(); //Open the port
if (!(port.IsOpen == true)) port.Open();
if (connecttodevice == true)
{
port.DataReceived += new SerialDataReceivedEventHandler(DataReceivedHandler);
DA.SetDataList(0, myReceivedLines);
}回答 2
Stack Overflow用户
回答已采纳
发布于 2012-09-30 08:11:52
您需要将SerialPort的用法包装在using statement中或实现IDisposable
// Dispose() calls Dispose(true)
public void Dispose()
{
Dispose(true);
GC.SuppressFinalize(this);
}
// The bulk of the clean-up code is implemented in Dispose(bool)
protected virtual void Dispose(bool disposing)
{
if (disposing)
{
// free managed resources
if (_serialPort != null)
{
_serialPort.Dispose();
_serialPort = null;
}
}
// free native resources if there are any.
}Stack Overflow用户
发布于 2021-10-17 18:35:05
我遇到了串口监听器的问题，主进程卡住了-因为它是同步的。进程，通过创建线程和计时器得到了解决
try
{
if (_serialConnection.IsOpen) _serialConnection.Close();
_serialConnection.Open();
Thread newThread = new Thread((obj) =>
{
System.Timers.Timer timer = new System.Timers.Timer();
timer.Interval = 1000;
timer.Elapsed += (sender, e) =>
{
_slave.Listen();
};
timer.Enabled = true;
timer.Start();
});
newThread.IsBackground = true;
newThread.Start();
}
catch (Exception ex)
{
throw ex;
}页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/12657479
复制相关文章
相似问题
腾讯云开发者
Copyright © 2013 - 2026 Tencent Cloud. All Rights Reserved. 腾讯云 版权所有
深圳市腾讯计算机系统有限公司 ICP备案/许可证号：粤B2-20090059 
粤公网安备44030502008569号
腾讯云计算（北京）有限责任公司 京ICP证150476号 | 京ICP备11018762号