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POEXC_BAD_INSTRUCTION when sending message to XPC Service
 

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    <p>I'm trying to use an XPC Service for inter-process communication. I've added an XPC service target to my project, and then when I try doing a <code>xpc_connection_send_message</code> I get <code>EXC_BAD_INSTRUCTION</code>. As far as I can tell, I am correctly initializing and starting the connection.</p> <pre><code>serviceConnection = xpc_connection_create("com.foo.bar.MyService", dispatch_get_main_queue()); xpc_connection_set_event_handler(serviceConnection, ^(xpc_object_t event) { xpc_type_t type = xpc_get_type(event); if (type == XPC_TYPE_ERROR) { if (event == XPC_ERROR_CONNECTION_INTERRUPTED) { // The service has either cancaled itself, crashed, or been // terminated. The XPC connection is still valid and sending a // message to it will re-launch the service. If the service is // state-full, this is the time to initialize the new service. } else if (event == XPC_ERROR_CONNECTION_INVALID) { // The service is invalid. Either the service name supplied to // xpc_connection_create() is incorrect or we (this process) have // canceled the service; we can do any cleanup of appliation // state at this point. NSLog(@"Uh oh, connection invalid"); xpc_release(serviceConnection); serviceConnection = nil; //xpc_release(stack); //stack = NULL; } else { NSLog(@"Unknown XPC error."); } } }); xpc_connection_resume(serviceConnection); </code></pre> <p>and then to send the message</p> <pre><code>xpc_object_t message = xpc_data_create(NULL, 0); .... xpc_connection_send_message(serviceConnection, message); </code></pre> <p>Is there anything I'm missing here? Is it somehow failing to find and connect to the service?</p>
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    1. USPeter Jacobs
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    1. COIs there anything in the debugger console?
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      1. USPeter Hosey
    2. COAfraid nothing much of use.
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    3. COIf there's anything at all related to XPC, it may be worth including in the question anyway.
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