C#.NET U盤插拔監控
阿新 • • 發佈：2019-02-19
【1】涉及的知識點
1) windows訊息處理函式
protected override void WndProc(ref Message m)捕獲Message的系統硬體改變發出的系統訊息
2) 硬體資訊類DriveInfo【2】核心函式
訊息常量：
/// <summary> /// windows訊息常量 /// </summary> class CWndProMsgConst { public const int WM_DEVICECHANGE = 0x219; // 系統硬體改變發出的系統訊息 public const int DBT_DEVICEARRIVAL = 0x8000;// 裝置檢測結束，並且可以使用 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;// 裝置解除安裝或者拔出 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; }
掃描函式：
/// <summary> /// 掃描U口裝置 /// </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("當前盤不能正確識別，請重新嘗試！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } } } }
訊息處理函式：
public void FillData(Form form, Message m, ListBox listbox) { _listbox = listbox; _form = form; try { if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系統硬體改變發出的系統訊息 { switch (m.WParam.ToInt32()) { case CWndProMsgConst.WM_DEVICECHANGE: break; //裝置檢測結束，並且可以使用 case CWndProMsgConst.DBT_DEVICEARRIVAL: { ScanUSBDisk(); _listbox.Items.Clear(); foreach (string str in _usbdiskList) { _listbox.Items.Add(str); } } break; // 裝置解除安裝或者拔出 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("當前盤不能正確識別，請重新嘗試！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information); } }
完整的CS封裝檔案：
using System;
using System.Collections.Generic;
using System.Text;
using System.Windows.Forms;
using System.Threading;
using System.IO;
namespace USBMonitor
{
/// <summary>
/// USB插拔監控類
/// </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;
// 達到間隔時發生
timer.Elapsed += new System.Timers.ElapsedEventHandler(TimerList);
timer.AutoReset = false; // 僅在間隔第一次結束後引發一次
}
public void FillData(Form form, Message m, ListBox listbox)
{
_listbox = listbox;
_form = form;
try
{
if (m.Msg == CWndProMsgConst.WM_DEVICECHANGE) // 系統硬體改變發出的系統訊息
{
switch (m.WParam.ToInt32())
{
case CWndProMsgConst.WM_DEVICECHANGE:
break;
//裝置檢測結束，並且可以使用
case CWndProMsgConst.DBT_DEVICEARRIVAL:
{
ScanUSBDisk();
_listbox.Items.Clear();
foreach (string str in _usbdiskList)
{
_listbox.Items.Add(str);
}
}
break;
// 裝置解除安裝或者拔出
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("當前盤不能正確識別，請重新嘗試！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
/// <summary>
/// 設定USB列表
/// </summary>
void TimerList(object sender, System.Timers.ElapsedEventArgs e)
{
ScanUSBDisk();
foreach (string str in _usbdiskList)
{
SetText(str);
}
}
/// <summary>
/// 掃描U口裝置
/// </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("當前盤不能正確識別，請重新嘗試！", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
}
}
}
}
/// <summary>
/// 設定List列表
/// </summary>
/// <param name="text">名稱</param>
public void SetText(string text)
{
if (_listbox == null)
return;
if (this._listbox.InvokeRequired) // 呼叫方位於建立控制元件所在的執行緒以外的執行緒中
{
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訊息常量
/// </summary>
class CWndProMsgConst
{
public const int WM_DEVICECHANGE = 0x219; // 系統硬體改變發出的系統訊息
public const int DBT_DEVICEARRIVAL = 0x8000;// 裝置檢測結束，並且可以使用
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;// 裝置解除安裝或者拔出
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;
}
}
測試窗體（重寫訊息函式）：
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);
}
}
}