/// <summary>
/// Message handler which must be called from client form. Processes Windows messages and calls event handlers.
/// </summary>
/// <param name="m"></param>
public void WndProc(ref Message m)
{
int devType;
if (m.Msg == WM_DEVICECHANGE)
{
var changeType = (WM_DEVICECHANGE)m.WParam.ToInt32();
var volumeInfo = new DEV_BROADCAST_VOLUME();
if (changeType == Win32.WM_DEVICECHANGE.DBT_DEVICEARRIVAL || changeType == Win32.WM_DEVICECHANGE.DBT_DEVICEREMOVECOMPLETE)
{
devType = Marshal.ReadInt32(m.LParam, 4);
if (devType == DBT_DEVTYP_VOLUME)
{
volumeInfo = (DEV_BROADCAST_VOLUME)Marshal.PtrToStructure(m.LParam, typeof(DEV_BROADCAST_VOLUME));
}
}
var e = new DeviceDetectorEventArgs(changeType, volumeInfo);
if (DeviceChanged != null) DeviceChanged(this, e);
switch (changeType)
{
// Device is about to be removed. Any application can cancel the removal.
case Win32.WM_DEVICECHANGE.DBT_DEVICEQUERYREMOVE:
devType = Marshal.ReadInt32(m.LParam, 4);
if (devType == DBT_DEVTYP_HANDLE)
{
// If the client wants to cancel, let Windows know.
if (e.Cancel) m.Result = (IntPtr)BROADCAST_QUERY_DENY;
}
break;
}
}
}
public DeviceDetectorEventArgs(WM_DEVICECHANGE changeType, DEV_BROADCAST_VOLUME volumeInfo)
{
Cancel = false;
_ChangeType = changeType;
_VolumeInfo = volumeInfo;
}
