qzdoom-gpl/src/cocoa/ImmrHIDUtilAddOn.c

//	    File: ImmrHIDUtilAddOn.c
//	Abstract: Glue code to convert IOHIDDeviceRef's to (FFB) io_object_t's
//	 Version: 2.0
//	
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#include <AvailabilityMacros.h>

#if MAC_OS_X_VERSION_MAX_ALLOWED >= 1050

#include <mach/mach.h>
#include <mach/mach_error.h>

#include "ImmrHIDUtilAddOn.h"

//---------------------------------------------------------------------------------
//
// AllocateHIDObjectFromIOHIDDeviceRef( )
//
//	returns:
//		NULL, or acceptable io_object_t
//
//---------------------------------------------------------------------------------
io_service_t AllocateHIDObjectFromIOHIDDeviceRef(IOHIDDeviceRef inIOHIDDeviceRef) {
	io_service_t result = 0L;
	if ( inIOHIDDeviceRef ) {
		// Set up the matching criteria for the devices we're interested in.
		// We are interested in instances of class IOHIDDevice.
		// matchingDict is consumed below( in IOServiceGetMatchingService )
		// so we have no leak here.
		CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOHIDDeviceKey);
		if ( matchingDict ) {
			// Add a key for locationID to our matching dictionary.  This works for matching to
			// IOHIDDevices, so we will only look for a device attached to that particular port
			// on the machine.
			CFTypeRef tCFTypeRef = IOHIDDeviceGetProperty( inIOHIDDeviceRef, CFSTR(kIOHIDLocationIDKey) );
			if ( tCFTypeRef ) {
				CFDictionaryAddValue(matchingDict, CFSTR(kIOHIDLocationIDKey), tCFTypeRef);
				// CFRelease( tCFTypeRef );	// don't release objects that we "Get".
				
				// IOServiceGetMatchingService assumes that we already know that there is only one device
				// that matches.  This way we don't have to do the whole iteration dance to look at each
				// device that matches.  This is a new API in 10.2
				result = IOServiceGetMatchingService(kIOMasterPortDefault, matchingDict);
			}
			
			// Note: We're not leaking the matchingDict.
			// One reference is consumed by IOServiceGetMatchingServices
		}
	}
	
	return (result);
}   // AllocateHIDObjectFromIOHIDDeviceRef

//---------------------------------------------------------------------------------
//
// FreeHIDObject( )
//
//---------------------------------------------------------------------------------
bool FreeHIDObject(io_service_t inHIDObject) {
	kern_return_t kr;
	
	kr = IOObjectRelease(inHIDObject);
	
	return (kIOReturnSuccess == kr);
} // FreeHIDObject

#endif // MAC_OS_X_VERSION_MAX_ALLOWED >= 1050