/// <summary>
/// Registers to be notified when devices are added or removed.
/// </summary>
/// <param name="register">True to register, False to unregister</param>
/// <param name="f">Form</param>
/// <returns>True if successfull, False otherwise</returns>
public bool RegisterForDeviceChange(bool doRegister, Form f)
{
var Status = false;
long LastError;
if (doRegister)
{
var deviceInterface = new Win32Wrapper.DEV_BROADCAST_DEVICEINTERFACE();
int size = Marshal.SizeOf(deviceInterface);
deviceInterface.dbcc_size = size;
deviceInterface.dbcc_devicetype = (int)Win32Wrapper.DBTDEVTYP.DBT_DEVTYP_DEVICEINTERFACE;
var buffer = default(IntPtr);
buffer = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(deviceInterface, buffer, true);
deviceEventHandle = Win32Wrapper.RegisterDeviceNotification(f.Handle, buffer,
(int)(Win32Wrapper.DEVICE_NOTIFY.DEVICE_NOTIFY_WINDOW_HANDLE | Win32Wrapper.DEVICE_NOTIFY.DEVICE_NOTIFY_ALL_INTERFACE_CLASSES));
Status = deviceEventHandle != IntPtr.Zero;
if (!Status)
{
LastError = Marshal.GetLastWin32Error();
}
Marshal.FreeHGlobal(buffer);
}
else
{
if (deviceEventHandle != IntPtr.Zero)
{
Status = Win32Wrapper.UnregisterDeviceNotification(deviceEventHandle);
}
deviceEventHandle = IntPtr.Zero;
}
return(Status);
}
/// <summary>
/// Registers to be notified when devices are added or removed.
/// </summary>
/// <param name="register">True to register, False to unregister</param>
/// <param name="f">Form</param>
/// <returns>True if successfull, False otherwise</returns>
public bool RegisterForDeviceChange(bool Register, System.Windows.Forms.Form f)
{
bool Status = false;
long LastError;
if (Register)
{
Win32Wrapper.DEV_BROADCAST_DEVICEINTERFACE deviceInterface = new Win32Wrapper.DEV_BROADCAST_DEVICEINTERFACE();
int size = Marshal.SizeOf(deviceInterface);
deviceInterface.dbcc_size = size;
deviceInterface.dbcc_devicetype = (Int32)Win32Wrapper.DBTDEVTYP.DBT_DEVTYP_DEVICEINTERFACE;
IntPtr buffer = default(IntPtr);
buffer = Marshal.AllocHGlobal(size);
Marshal.StructureToPtr(deviceInterface, buffer, true);
deviceEventHandle = Win32Wrapper.RegisterDeviceNotification(f.Handle, buffer, (int)(Win32Wrapper.DEVICE_NOTIFY.DEVICE_NOTIFY_WINDOW_HANDLE | Win32Wrapper.DEVICE_NOTIFY.DEVICE_NOTIFY_ALL_INTERFACE_CLASSES));
Status = (deviceEventHandle != IntPtr.Zero);
if (!Status)
{
LastError = Marshal.GetLastWin32Error();
}
Marshal.FreeHGlobal(buffer);
}
else
{
if (deviceEventHandle != IntPtr.Zero)
{
Status = Win32Wrapper.UnregisterDeviceNotification(deviceEventHandle);
}
deviceEventHandle = IntPtr.Zero;
}
return Status;
}
public void RegisterForDeviceNotification(Form form)
{
UnregisterForDeviceNotification();
// Register for WM_DEVICECHANGE notifications. This code uses these messages to detect plug and play connection/disconnection events for USB devices
Win32Wrapper.DEV_BROADCAST_DEVICEINTERFACE DeviceBroadcastHeader = new Win32Wrapper.DEV_BROADCAST_DEVICEINTERFACE();
DeviceBroadcastHeader.dbcc_devicetype = Win32Wrapper.DBT_DEVTYP_DEVICEINTERFACE;
DeviceBroadcastHeader.dbcc_size = (uint)Marshal.SizeOf(DeviceBroadcastHeader);
DeviceBroadcastHeader.dbcc_reserved = 0; //Reserved says not to use...
DeviceBroadcastHeader.dbcc_classguid = Win32Wrapper.InterfaceClassGuid;
// Need to get the address of the DeviceBroadcastHeader to call RegisterDeviceNotification(), but
// can't use "&DeviceBroadcastHeader". Instead, using a roundabout means to get the address by
// making a duplicate copy using Marshal.StructureToPtr().
IntPtr pDeviceBroadcastHeader = IntPtr.Zero; //Make a pointer.
pDeviceBroadcastHeader = Marshal.AllocHGlobal(Marshal.SizeOf(DeviceBroadcastHeader)); //allocate memory for a new DEV_BROADCAST_DEVICEINTERFACE structure, and return the address
Marshal.StructureToPtr(DeviceBroadcastHeader, pDeviceBroadcastHeader, false); //Copies the DeviceBroadcastHeader structure into the memory already allocated at DeviceBroadcastHeaderWithPointer
DeviceEventHandle = Win32Wrapper.RegisterDeviceNotification(form.Handle, pDeviceBroadcastHeader, Win32Wrapper.DEVICE_NOTIFY_WINDOW_HANDLE);
}
