asp.net識別u盤執行個體代碼

asp教程.net識別u盤執行個體代碼

using system;
using system.collections.generic;
using system.componentmodel;
using system.data;
using system.drawing;
using system.text;
using system.windows.forms;
using system.io;

namespace usb
{
  public partial class form1 : form
  {
  public const int wm_devicechange = 0x219;
  public const int dbt_devicearrival = 0x8000;
  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;
  public const int dbt_deviceremovepending = 0x8003;
  public const int dbt_devicetypespecific = 0x8005;
  public const int dbt_devnodes_changed = 0x0007;
  public const int dbt_querychangeconfig = 0x0017;
  public const int dbt_userdefined = 0xffff;

  public form1()
  {
  initializecomponent();
  }

  private void form1_load(object sender, eventargs e)
  {

  }

  protected override void wndproc(ref message m)
  {
  try
  {
  if (m.msg == wm_devicechange)
  {
  switch (m.wparam.toint32())
  {
  case wm_devicechange://
  break;
  case dbt_devicearrival://u盤插入
  driveinfo[] s = driveinfo.getdrives();
  foreach (driveinfo drive in s)
  {
  if (drive.drivetype == drivetype.removable)
  {
  richtextbox1.appendtext("u盤已插入，盤符為:" + drive.name.tostring() + "rn");
  break;
  }
  }
  break;
  case dbt_configchangecanceled:
  messagebox.show("2");
  break;
  case dbt_configchanged:
  messagebox.show("3");
  break;
  case dbt_customevent:
  messagebox.show("4");
  break;
  case dbt_devicequeryremove:
  messagebox.show("5");
  break;
  case dbt_devicequeryremovefailed:
  messagebox.show("6");
  break;
  case dbt_deviceremovecomplete: //u盤卸載
  richtextbox1.appendtext("u盤已卸載，盤符為:");
  break;
  case dbt_deviceremovepending:
  messagebox.show("7");
  break;
  case dbt_devicetypespecific:
  messagebox.show("8");
  break;
  case dbt_devnodes_changed://可用，裝置變化時
  messagebox.show("9");
  break;
  case dbt_querychangeconfig:
  messagebox.show("10");
  break;
  case dbt_userdefined:
  messagebox.show("11");
  break;
  default:
  break;
  }
  }
  }
  catch (exception ex)
  {
  messagebox.show(ex.message);
  }
  base.wndproc(ref m);
  }

  private void button1_click(object sender, eventargs e)
  {
   
  }

  }
}%>