class="FocusMe">【1】涉及的知识点
1) windows消息处理函数
? 1
protected override void WndProc(ref Message m)
捕获Message的系统硬件改变发出的系统消息
2) 硬件信息类
? 1DriveInfo
【2】核心函数
消息常量：
? 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19/// <summary>
/// windows消息常量
/// </summary>
class CWndProMsgConst
{
public const int WM_DEVICECHANGE = 0x219; // 系统硬件改变发出的系统消息
public const int DBT_DEVICEARRIVAL = 0x8000;// 设备检测结束，并且可以使用
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;// 设备卸载或者拔出
public const int DBT_DEVICEREMOVEPENDING = 0x8003;
public const int DBT_DEVICETYPEHANGED = 0x0007;
public const int DBT_QUERYCHANGSPECIFIC = 0x8005;
public const int DBT_DEVNODES_CECONFIG = 0x0017;
public const int DBT_USERDEFINED = 0xFFFF;
}
扫描函数：
/// <summary>
/// 扫描U口设备
/// </summary>
private void ScanUSBDisk()
{
_usbdiskList.Clear();
DriveInfo[] drives = DriveInfo.GetDrives();
foreach (DriveInfo drive in drives)
{
if ((drive.DriveType == DriveType.Removable) && !drive.Name.Substring(0, 1).Equals("A"))
{
try
{
_usbdiskList.Add(drive.Name);
}
catch
{
MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
消息处理函数：
public void FillData(Form form, Message m, ListBox listbox)
{
_listbox = listbox;
_form = form;
try
{
if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系统硬件改变发出的系统消息
{
switch (m.WParam.ToInt32())
{
case CWndProMsgConst.WM_DEVICECHANGE:
break;
//设备检测结束，并且可以使用
case CWndProMsgConst.DBT_DEVICEARRIVAL:
{
ScanUSBDisk();
_listbox.Items.Clear();
foreach (string str in _usbdiskList)
{
_listbox.Items.Add(str);
}
}
break;
// 设备卸载或者拔出
case CWndProMsgConst.DBT_DEVICEREMOVECOMPLETE:
{
ScanUSBDisk();
_listbox.Items.Clear();
foreach (string str in _usbdiskList)
{
_listbox.Items.Add(str);
}
}
break;
default:
break;
}
}
}
catch (Exception ex)
{
MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
完整的CS封装文件：
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.IO;
namespace USBMonitor
{
/// <summary>
/// USB插拔监控类
/// </summary>
public class CUSBMonitor
{
private delegate void SetTextCallback(string s);
private IList<string> _usbdiskList = new List<string>();
private ListBox _listbox = null;
private Form _form = null;
public CUSBMonitor()
{
System.Timers.Timer timer = new System.Timers.Timer(1000);
timer.Enabled = true;
// 达到间隔时发生
timer.Elapsed += new System.Timers.ElapsedEventHandler(TimerList);
timer.AutoReset = false; // 仅在间隔第一次结束后引发一次
}
public void FillData(Form form, Message m, ListBox listbox)
{
_listbox = listbox;
_form = form;
try
{
if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系统硬件改变发出的系统消息
{
switch (m.WParam.ToInt32())
{
case CWndProMsgConst.WM_DEVICECHANGE:
break;
//设备检测结束，并且可以使用
case CWndProMsgConst.DBT_DEVICEARRIVAL:
{
ScanUSBDisk();
_listbox.Items.Clear();
foreach (string str in _usbdiskList)
{
_listbox.Items.Add(str);
}
}
break;
// 设备卸载或者拔出
case CWndProMsgConst.DBT_DEVICEREMOVECOMPLETE:
{
ScanUSBDisk();
_listbox.Items.Clear();
foreach (string str in _usbdiskList)
{
_listbox.Items.Add(str);
}
}
break;
default:
break;
}
}
}
catch (Exception ex)
{
MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
/// <summary>
/// 设置USB列表
/// </summary>
void TimerList(object sender, System.Timers.ElapsedEventArgs e)
{
ScanUSBDisk();
foreach (string str in _usbdiskList)
{
SetText(str);
}
}
/// <summary>
/// 扫描U口设备
/// </summary>
private void ScanUSBDisk()
{
_usbdiskList.Clear();
DriveInfo[] drives = DriveInfo.GetDrives();
foreach (DriveInfo drive in drives)
{
if ((drive.DriveType == DriveType.Removable) && !drive.Name.Substring(0, 1).Equals("A"))
{
try
{
_usbdiskList.Add(drive.Name);
}
catch
{
MessageBox.Show("当前盘不能正确识别，请重新尝试！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
/// <summary>
/// 设置List列表
/// </summary>
/// <param name="text">名称
public void SetText(string text)
{
if (_listbox == null)
return;
if (this._listbox.InvokeRequired) // 调用方位于创建控件所在的线程以外的线程中
{
if (_listbox.Items.Contains(text))
return;
SetTextCallback d = new SetTextCallback(SetText);
_form.Invoke(d, new object[] { text });
}
else
{
if (_listbox.Items.Contains(text))
return;
this._listbox.Items.Add(text);
}
}
}
/// <summary>
/// windows消息常量
/// </summary>
class CWndProMsgConst
{
public const int WM_DEVICECHANGE = 0x219; // 系统硬件改变发出的系统消息
public const int DBT_DEVICEARRIVAL = 0x8000;// 设备检测结束，并且可以使用
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;// 设备卸载或者拔出
public const int DBT_DEVICEREMOVEPENDING = 0x8003;
public const int DBT_DEVICETYPEHANGED = 0x0007;
public const int DBT_QUERYCHANGSPECIFIC = 0x8005;
public const int DBT_DEVNODES_CECONFIG = 0x0017;
public const int DBT_USERDEFINED = 0xFFFF;
}
}
</string></string>
测试窗体（重写消息函数）：
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;
namespace USBMonitor
{
public partial class Main : Form
{
public Main()
{
InitializeComponent();
}
CUSBMonitor usbMonitor = new CUSBMonitor();
protected override void WndProc(ref Message m)
{
usbMonitor.FillData(this, m, _listBox);
base.WndProc(ref m);
}
}
}
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