C#编程语言程序开发技术文章

时间:2017-06-15 17:46

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C#.NET U盘插拔监控  
2015-01-28         来源:郎涯工作室        我要投稿  

【1】涉及的知识点

1) windows消息处理函数

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

DriveInfo
【2】核心函数

消息常量:

/// /// windows消息常量 /// 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:

/// /// 扫描U口设备 /// 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 { /// /// USB插拔监控类 /// public class CUSBMonitor { private delegate void SetTextCallback(string s); private IList _usbdiskList = new List(); 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); } } /// /// 设置USB列表 /// void TimerList(object sender, System.Timers.ElapsedEventArgs e) { ScanUSBDisk(); foreach (string str in _usbdiskList) { SetText(str); } } /// /// 扫描U口设备 /// 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); } } } } /// /// 设置List列表 /// /// 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); } } } /// /// windows消息常量 /// 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; } }
测试窗体(重写消息函数):