zz Alex's BLOG 串口连接

using System;

using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace ICS
{
    public partial class FrmMain : Form
    {

#region WndProc常量
public const int WM_DEVICECHANGE = 0x219;
public const int DBT_DEVICEARRIVAL = 0x8000;
public const int DBT_CONFIGCHANGECANCELED = 0x0019;
public const int DBT_CONFIGCHANGED = 0x0018;
public const int DBT_CUSTOMEVENT = 0x8006;
public const int DBT_DEVICEQUERYREMOVE = 0x8001;
public const int DBT_DEVICEQUERYREMOVEFAILED = 0x8002;
public const int DBT_DEVICEREMOVECOMPLETE = 0x8004;
public const int DBT_DEVICEREMOVEPENDING = 0x8003;
public const int DBT_DEVICETYPESPECIFIC = 0x8005;
public const int DBT_DEVNODES_CHANGED = 0x0007;
public const int DBT_QUERYCHANGECONFIG = 0x0017;
public const int DBT_USERDEFINED = 0xFFFF;

public const int DBT_DEVTYP_OEM = 0x00000000;//OEM- or IHV-defined device type
public const int DBT_DEVTYP_PORT = 0x00000003;//Port device (serial or parallel).
public const int DBT_DEVTYP_VOLUME = 0x00000002;//Logical volume.
#endregion

[StructLayout(LayoutKind.Sequential)]
public struct DEV_BROADCASR_HDR
{
public int Size;
public int DeviceType;
public int Reserved;
}
public FrmMain()
{
InitializeComponent();
}

protected override void WndProc(ref Message m)
{
base.WndProc(ref m);//要保证这句话必须能构执行，否则会出现“创建窗口句柄时出错”，和写代码习惯有关。。
try
{
if (m.Msg != WM_DEVICECHANGE) return;
DEV_BROADCASR_HDR devHdr = (DEV_BROADCASR_HDR)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCASR_HDR));
if (devHdr.DeviceType == DBT_DEVTYP_PORT)
{
AddSerialPort();
}
}
catch { }
}

public void AddSerialPort()
{
cmboxSerial.Items.Clear();
cmboxSerial.Items.AddRange(SerialPort.GetPortNames());
}

}

}