Device::HID->new() fails on macOS

[jhgorse]

Greetings,

Device::HID is failing to get the usb device when Device::USB appears to get it.

bash$ perl irrad_hid_probe.pl
Failed to hid_open at irrad_hid_probe.pl line 12.
No such device!

use Device::HID;
my $dev = Device::HID->new(vendor => 0x10c4, product => 0x63cd) or die "No such device!\n";

vs

use Device::USB;
my $usb = Device::USB->new();
...
my $dev = $usb->find_device( 0x10c4, 0x63cd );
$dev->open();
print "Manufactured by ", $dev->manufacturer(), "\n",
       " Product: ", $dev->product(), "\n";
...

How can I debug this?

[a3f]

So Device::USB works, but Device::HID doesn't? The hidapi README contains short C example code for reading manufacturer string. Please compile and try that to make sure that it's fine on the C side.

[jhgorse]

The C code works.

[a3f]

Had no time to look deeper into this. You couls start by implementing hid_error. It returns a wide character string, so some conversion is necessary. This should give you an idea about what fails where.