[Libusb-win32-devel] Extremely odd behaviour when debugging libusbK with CDB

[Chris E <sp...@gm...>]

Hi guys.
Looks like I've managed to stumble across some kind of reverse Heisenbug,
and it's been doing my head in for days.

I am developing a program using the Qt Library and LibusbK (precompiled
.dll/.lib).
When I compile and run, it works great - in debug or release mode.  I can
even deploy it on other machines and there are no immediate issues.
However, when I try to debug using CDB (the Qt/Visual Studio debugger),
UsbK_Init will always fail.

This is, of course, a little bit problematic.  Is there a way to get around
it?
If it helps, UsbK_Init returns error code 0x03 if compiled with Visual C++
2013 (x86 and x64), and 0xCE if compiled with MinGW x86.

Is this a known issue?  Do desktop debuggers do this often?  (If you
haven't guessed already, I have fairly minimal experience developing
Desktop software; I'm mainly used to microcontrollers and even there I'm no
expert.)

Thanks,
~Chris