Hat jemand schon mit mpusbapi.dll mehrere USB-Devices angesprochen?

//  MPUSBOpen : Returns the handle to the endpoint pipe with matching VID & PID

...

//  instance - An instance number of the device to open.

//             Typical usage is to call MPUSBGetDeviceCount first to find out

//             how many instances there are.

//             It is important to understand that the driver is shared among

//             different devices. The number of devices returned by

//             MPUSBGetDeviceCount could be equal to or less than the number

//             of all the devices that are currently connected & using the

//             generic driver.

//

//             Example:

//             if there are 3 device with the following PID&VID connected:

//             Device Instance 0, VID 0x04d8, PID 0x0001

//             Device Instance 1, VID 0x04d8, PID 0x0002

//             Device Instance 2, VID 0x04d8, PID 0x0001

//

//             If the device of interest has VID = 0x04d8 and PID = 0x0002

//             Then MPUSBGetDeviceCount will only return '1'.

//             The calling function should have a mechanism that attempts

//             to call MPUSBOpen up to the absolute maximum of MAX_NUM_MPUSB_DEV

//             (MAX_NUM_MPUSB_DEV is defined in _mpusbapi.h).

//             It should also keep track of the number of successful calls

//             to MPUSBOpen(). Once the number of successes equals the

//             number returned by MPUSBGetDeviceCount, the attempts should

//             be aborted because there will no more devices with

//             a matching vid&pid left.