Re: Public API for Bluetooth Inquiry (follow-up)

20 Nov 2002

      On 11/18/02 8:15 PM, "Eric Brown" <esb@apple.com> wrote:
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On Sunday, November 17, 2002, at 03:33  PM, Paul Davis wrote:
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Eric,
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I put some time into this and would like your opinion on my
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conclusions:
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1. I looked into using the IOBluetoothPairingController class as a
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means for
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obtaining the device name. The runPanelWithAttributes works fine
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however it
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returns nothing. Therefore, it's not very useful.
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That would be a problem, wouldn't it.  It will be fixed in the next dev
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release.
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I wouldn't worry about this. See my response below on 2.
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2. Next I used IOBluetoothDeviceSelector class. The
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runPanelWithAttributes
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returns a pointer to an IOBluetoothDevice with all the salient
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information
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pertaining to the selected device from the GUI. This is extremely
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useful.
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I'm having some trouble extracting the details of the Service Record
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but I
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won't burden you with questions until I have spent more time on this.
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Let us know how it turns out.  There should be API to do everything you
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need.
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I was able to get everything I need using the IOBluetoothDeviceSelector

class. I was able to select the remote device and extract all details of the

SDP records. I use the runPanelWithAttributes method. One question. Can you

verify if this methods performs an inquiry? It appears to since the

LastUpdate times always change but I would like to know for sure.
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3. After thinking more about this, the API Apple is working on that
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will
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give access to the list of paired devices would be useful. Probably a
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better
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method in lieu of public inquiry API.
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That sounds good - especially if you require the device to be paired to
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use.
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I am now convinced this is the way to go for my application as long based on

the results of 2. One question: Are the paired devices stored in a plist

that I could read?  If the answer is yes, I should be able to parse with XML

services and we may not need the paired devices API.
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4. I can't get the getRFCOMMChannelID method in the
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IOBluetoothSDPServiceRecord class method to work. It always bombs and
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was
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hoping you could comment. Are there are issues with this method?
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Is the app crashing or is it throwing an uncaught objc exception?  The
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code does have a couple of holes in the case where the
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ProtocolDescriptorList attribute is improperly formatted.  It checks
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the first UUID in each sequence in the ProtocolDescriptorList for the
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RFCOMM UUID.  Then it assumes that the sequence has a second element
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and attempts to get the RFCOMM channel ID from it.  So if one of the
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sequences has no elements or if the first element is the RFCOMM UUID
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and there is no second element, it will cause an exception to be
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thrown.  That's a bug and we'll fix it.  But it should work properly if
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the ProtocolDescriptorList is formatted correctly.
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- Eric
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Well this turned out to be my fault. Sorry for the erroneous information.

Thanks for the heads up about the exception. I'll make sure to cover

appropriately (throw/catch) later in the project.

One other question. Any idea when your stack will support the HID profile?

Even if you can tell me yes/no for 2003 this would be helpful.

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