c#.net u disk Plug and draw monitoring

"1" The knowledge points involved

1) Windows message processing functions

protected override void WndProc (ref Message m)

System hardware that captures a message changes the systems messages emitted

2) Hardware information class

DriveInfo

"2" core function

Message constants:

<summary>///Windows message constant///</summary>class cwndpromsgconst{public    const int wm_devicechange = 0x219; System hardware changes emitted system message public    const int dbt_devicearrival = 0x8000;//device detection ends, and public    const int DBT_ can be used 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;//device unloaded or unplugged 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;}    

Scan function:

        <summary>        //scan U-Port equipment        ///</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 ("The current disk is not recognized correctly, please try again!") "," hint ", MessageBoxButtons.OK, MessageBoxIcon.Information);}}}        

Message Handler functions:

        public void filldata (Form form, Message m, listbox listbox) {_listbox = listbox;            _form = form;                    try {if (m.msg = = cwndpromsgconst.wm_devicechange)//System hardware changes the message sent                            Switch (M.wparam.toint32 ()) {case Cwndpromsgconst.wm_devicechange:                        Break                                Device detection is complete, and case Cwndpromsgconst.dbt_devicearrival can be used: {                                Scanusbdisk (); _listbox.                                Items.clear (); foreach (String str in _usbdisklist) {_listbox.                                Items.Add (str);                        }} break;                       Device unload 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 is not recognized correctly, please re- Try!            "," hint ", MessageBoxButtons.OK, MessageBoxIcon.Information);            }        }

Complete CS Package file:

Using system;using system.collections.generic;using system.text;using system.windows.forms;using System.Threading; Using System.io;namespace usbmonitor{///<summary>///USB plug-in monitoring class///</summary> public class CUSBM        Onitor {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; A timer occurs when the interval is reached.            Elapsed + = new System.Timers.ElapsedEventHandler (timerlist); Timer. AutoReset = false;            Only one time after the first end of the interval} public void Filldata (Form form, Message m, listbox listbox) {            _listbox = ListBox;            _form = form; try {if (m.msg = = cwndpromsgconst.wm_devicechange)//SystemSystem message issued by hardware change {switch (M.wparam.toint32 ()) {CA                        Se CWndProMsgConst.WM_DEVICECHANGE:break;                                Device detection is complete, and case Cwndpromsgconst.dbt_devicearrival can be used: {                                Scanusbdisk (); _listbox.                                Items.clear (); foreach (String str in _usbdisklist) {_listbox.                                Items.Add (str);                        }} break;                                Device uninstall 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 is not recognized correctly, please re- Try!            "," hint ", MessageBoxButtons.OK, MessageBoxIcon.Information); }}///<summary>//Set USB list///</summary> void Timerlist (obje            CT sender, System.Timers.ElapsedEventArgs e) {scanusbdisk ();            foreach (String str in _usbdisklist) {SetText (str);        }}///<summary>//Scan U-Port equipment///</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 ("the current disk is not recognized correctly, please try again!")                    "," hint ", MessageBoxButtons.OK, MessageBoxIcon.Information);        }}}///<summary>//Set up list///</summary>  <param name= "text" > name </param> public void SetText (string text) {if (_listbox = =            NULL) return; if (This._listbox. invokerequired)//Call bearing {if (_listbox) in a thread other than the thread on which the control is created.                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 message constants///</summary> class Cwndpromsgconst {Pub Lic const int wm_devicechange = 0x219; System hardware changes emitted system message Public const int DBT_DEVICEARRIVAL = 0x8000;//device detection ends, and public const int Dbt_configcha can be used        ngecanceled = 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;//device unload or unplug 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; }    }

Test form (overriding 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);}}    

c#.net u disk Plug and draw monitoring