> On Jun 5, 2015, at 4:57 PM, Roland King <[email protected]> wrote:
>
>
>> On 6 Jun 2015, at 04:34, Carl Hoefs <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Using IOKit (OS X 10.10.3) how do I go about obtaining the mount point for
>> a USB device?
>>
>> A USB device I'm using is mounted as /dev/tty.usbmodemXXXXXXXX, where the
>> XXX's vary every time.
>>
>> I can successfully obtain the location ID for the device interface using
>> the VID & PID:
>>
>> kreturn = (*theDeviceInterface)->GetLocationID( theDeviceInterface,
>> &locationID );
>>
>> But how do I obtain the mount point string? I need to return it so that I
>> can do an fopen on it.
>>
>> -Carl
>>
>
> I had to go look at some old code of mine to find this. Here’s where I
> initialise an object of mine with an IOObject which is a plugged-in USB
> serial device, I usually use the callout device /dev/cu.usbmodemxxxxx, the
> tty I think is the dial in device. Usually it’s the callout you want to open.
>
> -(id)initWithIOObject:(io_object_t)io_object
> {
> self = [ super initWithIoObject:io_object ];
>
> if( self )
> {
> self.modemName = (__bridge_transfer NSString*
> )IORegistryEntryCreateCFProperty( io_object, CFSTR( kIOTTYDeviceKey ),
> NULL, 0 );
> self.callOutDevice = (__bridge_transfer NSString*
> )IORegistryEntryCreateCFProperty( io_object, CFSTR( kIOCalloutDeviceKey ),
> NULL, 0 );
> self.dialInDevice = (__bridge_transfer NSString*
> )IORegistryEntryCreateCFProperty( io_object, CFSTR( kIODialinDeviceKey ),
> NULL, 0 );
> self.bsdType = (__bridge_transfer NSString*
> )IORegistryEntryCreateCFProperty( io_object, CFSTR( kIOSerialBSDTypeKey ),
> NULL, 0 );
> }
>
> return self;
> }
>
> Where I found that in the documentation I have entirely forgotten.
Thanks, that looks like it should work nicely! My device is equally accessible
as /dev/tty.usbmodem* and /dev/cu.usbmodem*.
But first I need to get an io_object_t reference to the device. The only way I
know of is to get the device in a matching dictionary. Currently I’m doing the
following:
io_object_t device = 0;
io_iterator_t serialPortIter = 0;
CFMutableDictionaryRef matchDict =
IOServiceMatching(kIOSerialBSDServiceValue);
CFDictionarySetValue(matchDict, CFSTR(kIOSerialBSDTypeKey),
CFSTR(kIOSerialBSDModemType));
kern_return_t kernResult = IOServiceGetMatchingServices(kIOMasterPortDefault,
matchDict, &serialPortIter);
while ((device = IOIteratorNext(serialPortIter))) { ... }
For reasons that elude me, the result of the above code is an empty matchDict.
-Carl
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