Yes, device ID values are 0-based. You should not assume any particular
ordering, so if you want to separate the input and output devices, you
should test each device for input or output and add it to the
appropriate list.
The PmDefaults program does this. It is written in Java, but the code
that populates the drop-down boxes should be easy to follow, and you
might be interested to see the "test" button it provides where the user
can verify correct output device selection, and a "test" light to show
when input arrives on the selected input device.
I'll also mention that if you open devices for testing or anything else,
you may end up with an exclusive lock on the device that prevents other
applications from opening the device until the original program closes
the device.
-Roger
On 2/16/11 7:40 AM, Tim Burgess wrote:
Hi,
I'm just checking my understanding of how PortMIDI enumerates the
available I/O ports. I understand that device ID values are 0-based
and that I can check whether a given port is an input or output
device, but can I always assume that input ports are listed first,
followed by output ports? I'm populating a couple of list boxes in a
Windows application so that the user can choose which ports they want
to use, so I need to convert the relevant list box index into a valid
device ID to bind to a PmStream.
Best wishes.
Tim Burgess
Raised Bar Ltd
Phone: +44 (0)1827 719822
Don't forget to vote for improved access to music and music technology at
http://www.raisedbar.net/petition.htm
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