IsCheckedOut in der JvHidControllerClass

[DonAlfredo]

I hope you can read English ... my German writing is very bad ... !!

I have had the same problem.
An application with more than 10 identical USB-devices.

Normally, you could use the serial number of a device, but sometimes these are all similar.

I used the loaction of a device, on arrival.
Each USB device has a unique location: hub, port.

With this location, you can very reliable distinguish between devices !!
Two devices will NEVER have the same location.

Registry-entry: "SYSTEM\CurrentControlSet\Enum\USB\" ; LocationInformation.

You will need some extra code to use this method.

Good luck, Alfred.

[schwa226]

Thx for this tipp.

I also was testing it to identify the device by the serial number.
But I have a self programed AVR V-USB device. So I need to have different firmwares for different serial numbers.

The idea to take a look to the hub/port where the device is connected sounds good.

But anyway I will need to rewrite a lot of code because than I will need a list where I store the data of the device. Now I have only a single HIDDevice. I f the same device is getting plugged in the HIDDevice will be overwritten...

[DonAlfredo]

Well,

If you write your own firmware, this makes life easier.

I would advice against a different USB-serial.
This would mean special firmware for each device.
Which will be hard to maintain.

My suggestion:

Make use of a flag inside your USB-device.
Mark the device as being in use after arrival and checkout.
On arrival, check the in-use-flag of the device.
If in use, then skip (checkin), and go to the next one.



About your (correct) remark about the hub/port usage:
I maintain a list of devices inside the registry.
This list is checked on every device-arrival.