public static DeviceData GetDevice(IntPtr lParam)
{
DeviceData itemData = new DeviceData();
if ((int)lParam == 0)
{
return(itemData);
}
DevBroadcastHdr hdr = new DevBroadcastHdr();
Marshal.PtrToStructure(lParam, hdr);
itemData.DeviceType = ((DbtDeviceType)hdr.dbch_devicetype);
switch ((DbtDeviceType)hdr.dbch_devicetype)
{
case DbtDeviceType.DeviceInterface:
DevBroadcastDeviceinterfaceVariable devIf = new DevBroadcastDeviceinterfaceVariable();
// Convert lparam to DEV_BROADCAST_DEVICEINTERFACE structure
Marshal.PtrToStructure(lParam, devIf);
// Get the device path from the broadcast message
itemData.Data = new string(devIf.dbcc_name);
// Remove null-terminated data from the string
int pos = itemData.Data.IndexOf((char)0);
if (pos != -1)
{
itemData.Data = itemData.Data.Substring(0, pos);
}
break;
case DbtDeviceType.Port:
DevBroadcastPortVariable devPort = new DevBroadcastPortVariable();
// Convert lparam to DEV_BROADCAST_DEVICEINTERFACE structure
Marshal.PtrToStructure(lParam, devPort);
// Get the device path from the broadcast message
itemData.Data = new string(devPort.dbcc_name);
// Remove null-terminated data from the string
pos = itemData.Data.IndexOf((char)0);
if (pos != -1)
{
itemData.Data = itemData.Data.Substring(0, pos);
}
break;
case DbtDeviceType.Volume:
DevBroadcastVolume volume = new DevBroadcastVolume();
Marshal.PtrToStructure(lParam, volume);
itemData.Data = $"{((volume.dbcv_flags & (int) Dbtf.Media) == 1 ? "Media" : "Net")} {FirstDriveFromMask(volume.dbcv_unitmask)}";
break;
}
return(itemData);
}
/// <summary>
/// Get the DevBroadcastVolume
/// </summary>
/// <param name="devBroadcastVolume">out DevBroadcastVolume</param>
/// <returns>bool true the value could be converted</returns>
public bool TryGetDevBroadcastVolume(out DevBroadcastVolume devBroadcastVolume)
{
if (_devBroadcastHeader.DeviceType != DeviceBroadcastDeviceType.Volume)
{
devBroadcastVolume = default;
return(false);
}
devBroadcastVolume = Marshal.PtrToStructure <DevBroadcastVolume>(_deviceBroadcastPtr);
return(true);
}
/// <summary>
/// 等待 USB 存储设备接入。
/// </summary>
/// <returns>接入的 USB 设备盘符。</returns>
public static char WaitForUsbDevice()
{
DevBroadcastVolume vol = WndProcReceiverForm.WaitForSingleWndProc(
m =>
m.Msg == WM_DEVICECHANGE &&
(int)m.WParam == DBT_DEVICEARRIVAL &&
Marshal.ReadInt32(m.LParam, 4) == DBT_DEVTYP_VOLUME,
m =>
Marshal.PtrToStructure <DevBroadcastVolume>(m.LParam)).Item2;
BitArray bv = new BitArray(new int[] { vol.Mask });
char letter = '\0';
for (int i = 0; i < bv.Length; i++)
{
if (bv[i])
{
letter = (char)('A' + i);
}
}
return(letter);
}
private void DeviceChangeNotifier_DeviceNotifyVolume(System.Windows.Forms.Message msg, DevBroadcastVolume vol)
{
string result = string.Empty;
result += "DeviceType:: " + vol.DeviceType + "\n";
result += "Flags:: " + vol.Flags + "\n";
result += "Mask:: " + vol.Mask + "\n";
result += "Reserved:: " + vol.Reserved + "\n";
result += "Size:: " + vol.Size + "\n";
eventLog1.WriteEntry(result, EventLogEntryType.SuccessAudit);
}
