#43 Overflow Exception when using DeviceNotifier

[Johni85]

I want to use the DeviceNotifier but it raises an exception when I plug in or unplug the device:

System.OverflowException was unhandled
HResult=-2146233066
Message=Die arithmetische Operation hat einen Überlauf verursacht.
Source=mscorlib
StackTrace:
bei System.IntPtr.ToInt32()
bei LibUsbDotNet.DeviceNotify.WindowsDeviceNotifier.OnDeviceChange(Message& m)
bei LibUsbDotNet.DeviceNotify.Internal.DevNotifyNativeWindow.WndProc(Message& m)
bei System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
InnerException:

This error only occurs when I set the target framework to 4.5.
When I set the target plattform to x86 it works under .net 4.5 too.

[Johni85]

Correction: the error also occures when I set the target framework to 4.0

[Alessio]

I have the same problems, unfortunately it occurs on a Windows 8.1 PC, and not on my Windows 7 laptop. Any news?

[Deepblue978]

I noticed the overflow occurs on Win8 or higher because IntPtr has a size of 64bit. Thus casting to 32bits will cause the overflow. Casting to 64 bits will solve this issue.

Quick and dirty fix:

Change function OnDeviceChange in file WindowsDeviceNotifier.cs from

if (m.LParam.ToInt32() != 0)

to

long tempI = 0;
try
{
    tempI = m.LParam.ToInt32();
}
catch (System.OverflowException ofe)
{
    tempI = m.LParam.ToInt64();    
}
if (tempI != 0)

and rebuild the dll.