C# 连接或断开时检测USB到RS232转换器
我费了好大劲才找到系统上USB到RS232转换器的com端口号。在目前的系统中,我有15个我现在需要做的是检测连接或断开连接的时间,以便更新我的表。我可以找出如何检测USB存储设备,但同样的方法不适用于USB到RS232转换器。有人知道我怎么能发现这个吗 下面是我用来计算转换器使用的com端口的代码片段C# 连接或断开时检测USB到RS232转换器,c#,serial-port,usb,wmi,C#,Serial Port,Usb,Wmi,我费了好大劲才找到系统上USB到RS232转换器的com端口号。在目前的系统中,我有15个我现在需要做的是检测连接或断开连接的时间,以便更新我的表。我可以找出如何检测USB存储设备,但同样的方法不适用于USB到RS232转换器。有人知道我怎么能发现这个吗 下面是我用来计算转换器使用的com端口的代码片段 private void btn_tst2_Click(object sender, EventArgs e) { ManagementObjectSearcher
private void btn_tst2_Click(object sender, EventArgs e)
{
ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2",
"SELECT * FROM Win32_PnPEntity WHERE ClassGuid=\"{4d36e978-e325-11ce-bfc1-08002be10318}\"");
foreach (ManagementObject queryObj in searcher.Get())
{
rtxbx_output.AppendText(queryObj["Name"].ToString() +"\r");
}
}
您可以创建某种类型的线程或任务来查询从方法
System.IO.Ports.SerialPort.GetPortNames()
返回的数组:当此数组更改或添加新元素时,表示新的串行端口已连接到系统
当然,它将返回系统上的每个串行端口,但是您可以选择其中哪些是带有代码片段的USB-RS232转换器。您可以使用
MSSerial\u PortName
请查找代码片段
注意:这不是工作代码,您必须根据需要进行更改
private void btn_tst2_Click(object sender, EventArgs e)
{
// connection to WMI rather than cimv2 namespace
ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\WMI",
"select * from MSSerial_PortName");
foreach (ManagementObject queryObj in searcher.Get())
{
queryObj["Active"]; // status
queryObj["InstanceName"];
queryObj["PortName"]; // port number
}
}
在经历了许多挫折之后,我终于想出了如何实现我所需要的。我会把答案贴出来,以防它给未来困在同一地区的任何人一个指针。我在代码中包含注释。最后我得到的是一个所有Com端口的列表,当一个端口离开或加入时,它会被刷新。在您的电脑上可以找到文件dbt.h 要使下面的代码正常工作,只需使用一个富文本框和两个按钮创建一个解决方案
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Management; //used to perform WMI queries
using System.Threading;
using System.Runtime.InteropServices; // needed for marshalling
namespace MissionControl
{
public partial class Control : Form
{
public Control()
{
InitializeComponent();
}
// WndProc = Window Procedures: Every window has an associated window procedure — a function that processes all messages sent
// or posted to all windows of the class. All aspects of a window's appearance and behavior depend on the window procedure's
// response to these messages. see https://msdn.microsoft.com/en-us/library/ms632593%28v=vs.85%29.aspx
protected override void WndProc(ref Message m)
{
//you may find these definitions in dbt.h
const int WM_DEVICECHANGE = 0x0219; // in dbt.h, BroadcastSpecialMessage constants.
const int DBT_DEVICEARRIVAL = 0x8000; // system detected a device arrived see dbt.h
const int DBT_DEVICEREMOVECOMPLETE = 0x8004; //system detected a device removal see dbt.h
const int DBT_DEVTYP_PORT = 0x00000003; // serial, parallel in dbt.h
switch (m.Msg)
{
case WM_DEVICECHANGE:
switch (m.WParam.ToInt32())
{
case DBT_DEVICEARRIVAL:
{
// Get the DBT_DEVTYP* as defined in dbt.h
// We are looking for DBT_DEVTYP_PORT value = 3 which is Serial port
int devTypeA = Marshal.ReadInt32(m.LParam, 4);
if (devTypeA == DBT_DEVTYP_PORT)
{
rchtxbx_output.SelectedText = string.Empty;
rchtxbx_output.SelectionFont = new Font(rchtxbx_output.SelectionFont, FontStyle.Bold);
rchtxbx_output.SelectionColor = Color.Lime;
rchtxbx_output.AppendText("\rSerial Port Connected\r\rList of Current Ports\r");
}
else
{
// We should never get in here but just in case do somethign rather than fall over
rchtxbx_output.SelectedText = string.Empty;
rchtxbx_output.SelectionFont = new Font(rchtxbx_output.SelectionFont, FontStyle.Bold);
rchtxbx_output.SelectionColor = Color.Red;
rchtxbx_output.AppendText("Non-Serial Port Connected\r");
}
//To prevent cross threading we will start the function call in its own thread
// Create the thread object, passing in GetPortNum
//ThreadA is the arrival thread (just connected)
Thread ThreadA = new Thread(new ThreadStart(GetPortNum));
// Start the thread via a ThreadStart delegate
ThreadA.Start();
}
break;
case DBT_DEVICEREMOVECOMPLETE:
{
// Get the DBT_DEVTYP* as defined in dbt.h
// We are looking for DBT_DEVTYP_PORT value = 3 which is Serial port
int devTypeD = Marshal.ReadInt32(m.LParam, 4);
if (devTypeD == DBT_DEVTYP_PORT)
{
rchtxbx_output.SelectedText = string.Empty;
rchtxbx_output.SelectionFont = new Font(rchtxbx_output.SelectionFont, FontStyle.Bold);
rchtxbx_output.SelectionColor = Color.Lime;
rchtxbx_output.AppendText("\rSerial Port Disconnected\r\rList of Current Ports\r");
}
else
{
// We should never get in here but just in case do something rather than fall over
rchtxbx_output.SelectedText = string.Empty;
rchtxbx_output.SelectionFont = new Font(rchtxbx_output.SelectionFont, FontStyle.Bold);
rchtxbx_output.SelectionColor = Color.Red;
rchtxbx_output.AppendText("Non-Serial Port Disconneted\r");
}
//To prevent cross threading we will start the function call in its own thread
// Create the thread object, passing in GetPortNum
//ThreadD is the departure thread (disconnected)
Thread ThreadD = new Thread(new ThreadStart(GetPortNum));
// Start the thread via a ThreadStart delegate
ThreadD.Start();
}
break;
}
break;
}
//we detect the media arrival event
base.WndProc(ref m);
}
private void btn_close_Click(object sender, EventArgs e)
{
this.Close();
}
private void btn_clr_Click(object sender, EventArgs e)
{
rchtxbx_output.Clear();
}
private void GetPortNum()
{
//Windows Management Instrumentation (WMI) consists of a set of extensions to the Windows Driver Model that provides an
//operating system interface through which instrumented components provide information and notification.
// To work out the WMI to use, get the tool https://www.microsoft.com/en-us/download/details.aspx?id=8572
//GUID (or UUID) is an acronym for 'Globally Unique Identifier' (or 'Universally Unique Identifier'). It is a 128-bit
//integer number used to identify resources. The term GUID is generally used by developers working with Microsoft
//technologies, while UUID is used everywhere else.
// Get the list of ClassGUID from https://msdn.microsoft.com/en-us/library/windows/hardware/ff553426%28v=vs.85%29.aspx
string comportnum = "";
int textStart = 0;
char[] textEnd = { ')' };
ManagementObjectSearcher searcher = new ManagementObjectSearcher("root\\CIMV2",
"SELECT * FROM Win32_PnPEntity WHERE ClassGuid=\"{4d36e978-e325-11ce-bfc1-08002be10318}\"");
foreach (ManagementObject queryObj in searcher.Get())
{
comportnum = queryObj["Name"].ToString(); // Get the name of the comm port
//Format the string to extract the comport number only
textStart = comportnum.IndexOf("(COM");
comportnum = comportnum.Remove(0, textStart + 4).TrimEnd(textEnd);
//To prevent cross threading use Invoke. We are writing to a control created in another thread.
rchtxbx_output.Invoke(new EventHandler(delegate
{
rchtxbx_output.SelectedText = string.Empty;
rchtxbx_output.SelectionFont = new Font(rchtxbx_output.SelectionFont, FontStyle.Bold);
rchtxbx_output.SelectionColor = Color.Lime; //set font colour
rchtxbx_output.AppendText("Comm Port = " + comportnum + "\r"); //add some text
rchtxbx_output.ScrollToCaret(); // move cursor to the end
}));
}
}
}
}
我需要知道的是什么时候插入usb,而不是端口号。上面的代码为我找到了端口号,但到目前为止我无法知道USB何时插入。谢谢,但为了完成这项工作,我发现您必须以管理员身份运行。然后,它会给出端口号,就像我的原始代码一样,不需要以管理员身份运行即可工作。这仍然给了我一个问题,即不知道USB到RS232是何时插入或删除的,这就是我现在正在尝试的。如果它是硬盘,我可以得到这个,如果它是USB到RS232设备,你知道如何得到它吗?是的,你是对的,它必须是管理员。但是你不能通过queryObj[“Active”];获得正确的状态吗;。我建议使用wbemtest来进行插拔和检查状态。