private void RegisterNotification(Guid guid)
{
Dbt.DEV_BROADCAST_DEVICEINTERFACE devIF = new Dbt.DEV_BROADCAST_DEVICEINTERFACE();
IntPtr devIFBuffer;
// Set to HID GUID
devIF.dbcc_size = Marshal.SizeOf(devIF);
devIF.dbcc_devicetype = Dbt.DBT_DEVTYP_DEVICEINTERFACE;
devIF.dbcc_reserved = 0;
devIF.dbcc_classguid = guid;
// Allocate a buffer for DLL call
devIFBuffer = Marshal.AllocHGlobal(devIF.dbcc_size);
// Copy devIF to buffer
Marshal.StructureToPtr(devIF, devIFBuffer, true);
// Register for HID device notifications
m_hNotifyDevNode = Dbt.RegisterDeviceNotification((new WindowInteropHelper(this)).Handle, devIFBuffer, Dbt.DEVICE_NOTIFY_WINDOW_HANDLE);
// Copy buffer to devIF
Marshal.PtrToStructure(devIFBuffer, devIF);
// Free buffer
Marshal.FreeHGlobal(devIFBuffer);
}
private void WndProcClient_MessageReceived(object?sender, WndProcClient.WindowMessage e)
{
Console.WriteLine(e);
switch (e.Msg)
{
case WndProcClient.WindowsMessage.WM_DEVICECHANGE:
Dbt subId = (Dbt)e.wParam.ToInt64();
if (subId == Dbt.CustomEvent ||
subId == Dbt.DeviceArrival ||
subId == Dbt.DeviceQueryRemove ||
subId == Dbt.DeviceQueryRemoveFailed ||
subId == Dbt.DeviceRemoveComplete ||
subId == Dbt.DeviceRemovePending ||
subId == Dbt.DeviceTypeSpecific)
{
DoBroadcastHdr(e);
}
break;
}
}
}//class Form
//--
void HandleMessage(ref Message m)
{
WindowMessageId msgId = (WindowMessageId)m.Msg;
if (msgId == WindowMessageId.DeviceChange)
{
Dbt subId = (Dbt)m.WParam;
if (subId == Dbt.CustomEvent ||
subId == Dbt.DeviceArrival ||
subId == Dbt.DeviceQueryRemove ||
subId == Dbt.DeviceQueryRemoveFailed ||
subId == Dbt.DeviceRemoveComplete ||
subId == Dbt.DeviceRemovePending ||
subId == Dbt.DeviceTypeSpecific)
{
DoBroadcastHdr(m);
}
}
else if (msgId == WindowMessageId.ActivateApp)
{
}
}
// Unregister HID device notification
private void UnregisterNotification()
{
uint ret = Dbt.UnregisterDeviceNotification(m_hNotifyDevNode);
}
