Question

您好我必须开发一个使用C＃检测USB HDD的应用程序。可能吗？。我有一个用于检测USB大容量存储设备的代码。我添加了对System.Runtime.InteropServices的引用我试图覆盖WndProc（）方法。我将包含代码段

protected override void WndProc(ref Message message)
{
 base.WndProc(ref message);
 if ((message.Msg != WM_DEVICECHANGE) || (message.LParam == IntPtr.Zero))
 return;
DEV_BROADCAST_VOLUME volume = (DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(message.LParam, typeof(DEV_BROADCAST_VOLUME));

if (volume.dbcv_devicetype == DBT_DEVTYP_VOLUME)
{
switch (message.WParam.ToInt32())
{
  // New device inserted...
  case DBT_DEVICEARRIVAL:
       MessageBox.Show(
      string.Format("A storage device has been inserted; Drive :{0}", ToDriveName(volume.dbcv_unitmask)), "Detect USB");
      break;

   // Device Removed.
   case DBT_DEVICEREMOVECOMPLETE:
        MessageBox.Show("Storage has been removed.", "Detect USB");
        break;
     }
   }
 }
}

Answer 1

我开发了以下USB笔式驱动器的应用程序是我的声明：

        const int WM_DEVICECHANGE = 0x0219;
        const int DBT_DEVICEARRIVAL = 0x8000;
        const int DBT_DEVICEREMOVALCOMPLETE = 0x8004;
        const int DBT_DEVTYPVOLUME = 0x00000002;

以下是我对WinProc：

的覆盖

        protected override void WndProc(ref Message m)
        {
            try
            {
                if (m.Msg == WM_DEVICECHANGE)
                {
                    DEV_BROADCAST_VOLUME vol = (DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));
                    if ((m.WParam.ToInt32() == DBT_DEVICEARRIVAL) && (vol.dbcv_devicetype == DBT_DEVTYPVOLUME))
                    {
                        usb_drive = DriveMaskToLetter(vol.dbcv_unitmask).ToString();

                        if (usb_drive.Replace(" ", "").Length > 0)
                        {

                            // USB Inserted                                  
                        }
                    }
                    if ((m.WParam.ToInt32() == DBT_DEVICEREMOVALCOMPLETE) && (vol.dbcv_devicetype == DBT_DEVTYPVOLUME))
                    {
                        //USB Removed
                    }
                }
                base.WndProc(ref m);
            }
            catch
            {

            }
        }

如何使用c＃以编程方式检测USB HDD

1 个答案: