C #. net usb flash drive plugging monitoring

C #. net usb flash drive plugging monitoring

[1] knowledge points involved

1) windows message processing functions

protected override void WndProc(ref Message m)

System messages sent from system hardware changes that Capture Messages

2) hardware information

DriveInfo

[2] core functions

Message constant:

////// Windows message constant ///Class CWndProMsgConst {public const int WM_DEVICECHANGE = 0x219; // system message issued by system hardware change public const int DBT_DEVICEARRIVAL = 0x8000; // The device detection is complete, 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; // uninstall the device or remove the 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 = 0 xFFFF ;}

Scan function:

////// Scan U Port Devices ///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 ("the current disk cannot be identified correctly. Please try again! "," Prompt ", MessageBoxButtons. OK, MessageBoxIcon. Information );}}}}

Message Processing functions:

Public void FillData (Form form, Message m, ListBox listbox) {_ listbox = listbox; _ form = form; try {if (m. msg = CWndProMsgConst. WM_DEVICECHANGE) // system message sent by system hardware Change {switch (m. WParam. toInt32 () {case CWndProMsgConst. WM_DEVICECHANGE: break; // The device detection is complete. You can use case CWndProMsgConst. DBT_DEVICEARRIVAL: {ScanUSBDisk (); _ listbox. items. clear (); foreach (string str in _ usbdiskList) {_ listbox. items. add (str) ;} Break; // detach the device or remove 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 ("the current disk cannot be identified correctly. Please try again! "," Prompt ", MessageBoxButtons. OK, MessageBoxIcon. Information );}}

Complete CS encapsulation file:

Using System; using System. Collections. Generic; using System. Text; using System. Windows. Forms; using System. Threading; using System. IO; namespace USBMonitor {////// USB plugging monitoring class ///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; // timer occurs when the interval is reached. elapsed + = new System. timers. elapsedEventHandler (TimerList); timer. autoReset = false; // only triggered once after the first interval ends} public void FillData (Form form, Message m, ListBox listbox) {_ listbox = listbox; _ form = Form; try {if (m. ms G = CWndProMsgConst. WM_DEVICECHANGE) // system message sent by system hardware Change {switch (m. WParam. toInt32 () {case CWndProMsgConst. WM_DEVICECHANGE: break; // The device detection is complete. You can use case CWndProMsgConst. DBT_DEVICEARRIVAL: {ScanUSBDisk (); _ listbox. items. clear (); foreach (string str in _ usbdiskList) {_ listbox. items. add (str) ;}} break; // uninstall the device or unplug 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 ("the current disk cannot be identified correctly. Please try again! "," Prompt ", MessageBoxButtons. OK, MessageBoxIcon. Information );}}///
   /// Set the USB list ///Void TimerList (object sender, System. Timers. ElapsedEventArgs e) {ScanUSBDisk (); foreach (string str in _ usbdiskList) {SetText (str );}}///
   /// Scan U Port Devices ///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 ("the current disk cannot be identified correctly. Please try again! "," Prompt ", MessageBoxButtons. OK, MessageBoxIcon. Information );}}}}///
   /// Set List //////
   NamePublic void SetText (string text) {if (_ listbox = null) return; if (this. _ listbox. invokeRequired) // The call orientation is {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 message constant ///Class CWndProMsgConst {public const int WM_DEVICECHANGE = 0x219; // system message issued by system hardware change public const int DBT_DEVICEARRIVAL = 0x8000; // The device detection is complete, 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; // uninstall the device or remove the 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 = 0 xFFFF ;}}
  
 

Test form (rewrite message function ):

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);        }    }}