Find out which process has an exclusive lock on a USB device handle

Question

I have a library that reads/writes to a USB-device using CreateFile() API. The device happens to implement the HID-device profile, such that it\'s compatible with Microsoft\

Answer 1

This is what I use to read from a Magtek card reader:

//Open file on the device
deviceHandle = 
    CreateFile (deviceDetail->DevicePath, 
    GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE, 
    NULL, OPEN_EXISTING, 0, NULL);

Try those options and see if you can at least read from the device.

I understand your pain here... I found the USB HID documentation to be basically wrong in several places.

[Edit] There's not much out there on this problem. Here's a codeproject link that lightly touches on the subject in a thread at the bottom. Sounds like maybe if it's a keyboard or mouse windows grabs it exclusively.