Title: RE: Need to identify a physical USB hub
port
A while back you answered my question about obtaining the
locationID of a USB device(reader) into which a flash media is
plugged. I just tried your suggestion with the following code:
The BSDNodeName is properly returned.
getWholeMedia(...) is derived from the sample code at:
<http://developer.apple.com/samplecode/VolumeToBSDNode/VolumeToBSDNode.html>. After I iterate up to theWholeMedia and use
that value in IORegistryEntrySearchCFProperty, that function
returns 0 for assignment into locationIDCFString. I believe
that that's wrong because the following function crashes the app as
expected. Do you see anything wrong with my code? If not, I'll detail
the function getWholeMedia.
Thank you.
At 9:25 AM -0500 5/26/05, Chris Reed wrote:
It's pretty easy,
actually. Find the IOMedia object for the mounted volume, then
walk up that object's parents until you hit an IOUSBDevice, which will
have the locationID property. Or you can use
IORegistryEntrySearchCFProperty() to do it in one call.
There are several
ways to find the IOMedia object for the volume. Perhaps the easiest is
to install a notification handler to watch for new IOMedia
objects.
Another way would be
to use the statfs() call to get the device path. It will be something
like "/dev/disk0s4". Strip the "/dev/", and
search for an IOMedia with a "BSD Name" property with that
value.
There's other ways
as well, but that should give you the basic idea.
Cheers
-chris
--
-----
B. Mitchell
Loebel 408 425-9920 cell
Executive
Director
The Tech Startup
Connection
(formerly The PARALLEL Processing
Connection)
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