在c#中打开串口时出错
因此,当我尝试使用 SerialPort.Open() 方法在 ac# 应用程序中打开 COM1 时,收到以下异常:
“ArgumentException: 给定的端口名称不以 COM/com 开头或无法解析为有效的串行端口但是
,如果我在设备管理器中禁用 Com1 端口,然后再启用,则一切正常。从那时起,就没有问题了。我可以运行应用程序并打开端口,不会失败。但如果我重置电脑,我会遇到同样的问题,直到我禁用然后启用。
当我启动计算机时,Com1 似乎没有打开。当 Com1 打开时,我尝试使用我的应用程序打开,但没有收到 ArgumentException。相反,我收到一个异常,即对该端口的访问被拒绝。
我只在 Windows 7 机器上尝试过此操作。我用的是VS2010。我尝试过.net 3.5 & 4.0。
因此,正如我所说,一旦我重置端口,该应用程序就可以正常工作。有什么想法吗?
代码(这是一个简单的测试应用程序):
public partial class Form1 : Form
{
SerialPort port = new SerialPort();
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string[] ports = SerialPort.GetPortNames();
foreach (string element in ports)
{
textBox1.Text = element + "\r\n";
}
}
private void button1_Click(object sender, EventArgs e)
{
port.PortName = "COM1";
port.BaudRate = 9600;
port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.Handshake = Handshake.None; // Handshake.RequestToSend;
port.ReadTimeout = 1000;
port.WriteTimeout = 500;
try
{
port.Open();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
button1.Text = port.IsOpen.ToString();
}
}
}
So I am receiving the following exception when I attempt to open COM1 in a c# application, using the SerialPort.Open() method:
"ArgumentException: The given port name does not start with COM/com or does not resolve to a valid serial port"
However, if I disable the Com1 port in Device Manager, then enable, everything works fine. From then on, no problems. I can run the app and open the port without fail. But if I reset the PC, I experience the same issue, until I disable then enable.
Com1 does not appear to be open when I start the computer. When Com1 is open, and I try to open with my app, I do not get an ArgumentException. Rather, i get an exception that access to that port is denied.
I have only attempted this with Windows 7 machines. I am using VS2010. I tried .net 3.5 & 4.0.
So, as I've said, the app works fine ONCE I reset the port. Any thoughts?
Code (This is a simple test app):
public partial class Form1 : Form
{
SerialPort port = new SerialPort();
public Form1()
{
InitializeComponent();
}
private void Form1_Load(object sender, EventArgs e)
{
string[] ports = SerialPort.GetPortNames();
foreach (string element in ports)
{
textBox1.Text = element + "\r\n";
}
}
private void button1_Click(object sender, EventArgs e)
{
port.PortName = "COM1";
port.BaudRate = 9600;
port.Parity = Parity.None;
port.DataBits = 8;
port.StopBits = StopBits.One;
port.Handshake = Handshake.None; // Handshake.RequestToSend;
port.ReadTimeout = 1000;
port.WriteTimeout = 500;
try
{
port.Open();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
button1.Text = port.IsOpen.ToString();
}
}
}
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我想通了。
由于某种原因,Adobe PDF 被分配给 COM1。如果我将 Adobe 迁移到 COM2,那么一切都很好。我想由于 Adobe 没有主动使用该端口,这就是为什么我没有收到“访问被拒绝”的消息。
我根本不知道为什么 Adobe PDF 需要串行端口。
感谢您的意见/投票。
I figured it out.
Adobe PDF, for some reason, is assigned to COM1. If I move Adobe to COM2, then all is well. I suppose since Adobe is not actively using the port, that is why I don't get "access denied."
I have no idea why Adobe PDF needs a serial port at all.
THanks for the views/votes.
我禁用了comport,然后再次启用!
然后将其重命名为例如COM6!一些COM6。一些步骤是:
控制面板=>设备管理器=>串行端口(COM ... =>高级设置=>
从组合框中更改端口名称,
并删除我的打印机设备中的硝基PDF
I disabled comport and then enabled again!!
And then renamed it to for example COM6! some COM6. Some of steps is :
Control Panel=>Device Manager=>Serial Ports(COM ... =>Advanced setting =>
Change port name from combo-box,
And delete nitro-PDF in my printers device