Hi, =


The problem is in WinUsbDevice.CloseDeviceHandle():

if (!(myDevInfo.deviceHandle.IsInvalid)){

since myDevInfo.deviceHandle is null. You can fix this by testing the =

deviceHandle for null.

internal void CloseDeviceHandle()
{
	if (myDevInfo.deviceHandle !=3D null) {
		try {
			if (!(myDevInfo.deviceHandle.IsInvalid)) {
				FileIO.CloseHandle(myDevInfo.deviceHandle);
			}
			//  Free resources.
			WinUsb_Free(myDevInfo.winUsbHandle);
		} catch (Exception ex) {
			throw;
		}
	}
} =


The real problem is that the try/catch is rethrown without handling it whic=
h is =

the same as not having any try/catch at all. Remove the throw and it will a=
lso =

work. I am not sure why you would rethrow without doing anything with the =

exception instead of not catching it at all.

/Ruben
<http://www.rjjournal.net>

> I admit I have not much ideas when it comes to C# and Windows GUI program=
ming.
> Now here is the problem, Jan Axelson has written the USB PIC firmware and=
 the
> host program (in C# and VB.net) as an example to test WinUSB.
> =

> I have tried the host software and the firmware and they seem to work
> fine except one bug. If I do nothing and close the program, the program
> will raise an unhandled exception.
> =

> Download:
> http://www.lvr.com/winusb.htm
> =

> Detailed description of the problem:
> http://forum.microchip.com/tm.aspx?m=3D339511
> =

> I suppose Jan Axelson will solve the problem sooner or later. But
> I am thinking this must be not a complicated problem and I'd like
> to solve it as a learning exercise. But it proved to be more difficult
> than I thought. Any ideas?
> =

> By the way, I have written libusb based program to test the firmware
> under Linux and the program runs fine.
> http://forum.microchip.com/tm.aspx?m=3D340892
> =

> =

> Regards,
> Xiaofan
> -- =

> http://www.piclist.com PIC/SX FAQ & list archive
> View/change your membership options at
> http://mailman.mit.edu/mailman/listinfo/piclist
> =


=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D

-- =

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