特定のUSBデバイスが追加または削除されたときに通知を受け取ろうとしています。「アプリケーションからハードウェアにアクセスする」ドキュメントを読み、主にそのドキュメントで提供されているコードに基づいた、必要最低限のデモアプリケーションを用意しました。
デバイスが最初に追加または削除されたときに機能しますが、その後はコールバックが呼び出されません。なぜわからないの?誰かが私が間違っているところを見つけることができますか?
(テストしたい場合はxcodeプロジェクト) http://monkeyfood.com/testIOKitNOtificaiton.zip
ありがとう。
//
// AppDelegate.m
// testIOKitNotification
//
// Created by Diggory Laycock on 23/07/2012.
// Copyright (c) 2012 MonkeyFood.com. All rights reserved.
//
#import "AppDelegate.h"
@implementation AppDelegate
// Arduino USB info
#define matchVendorID 0x2341
#define matchProductID 0x0043
#pragma mark -
#pragma mark C Callback functions
#pragma mark -
void usbDeviceAppeared(void *refCon, io_iterator_t iterator){
NSLog(@"Matching USB device appeared");
}
void usbDeviceDisappeared(void *refCon, io_iterator_t iterator){
NSLog(@"Matching USB device disappeared");
}
@synthesize window = _window;
#pragma mark -
#pragma mark Application Methods
#pragma mark -
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
io_iterator_t newDevicesIterator;
io_iterator_t lostDevicesIterator;
newDevicesIterator = 0;
lostDevicesIterator = 0;
NSLog(@" ");
NSMutableDictionary *matchingDict = (__bridge NSMutableDictionary *)IOServiceMatching(kIOUSBDeviceClassName);
if (matchingDict == nil){
NSLog(@"Could not create matching dictionary");
return;
}
[matchingDict setObject:[NSNumber numberWithShort:matchVendorID] forKey:(NSString *)CFSTR(kUSBVendorID)];
[matchingDict setObject:[NSNumber numberWithShort:matchProductID] forKey:(NSString *)CFSTR(kUSBProductID)];
// Add notification ports to runloop
IONotificationPortRef notificationPort = IONotificationPortCreate(kIOMasterPortDefault);
CFRunLoopSourceRef notificationRunLoopSource = IONotificationPortGetRunLoopSource(notificationPort);
CFRunLoopAddSource([[NSRunLoop currentRunLoop] getCFRunLoop], notificationRunLoopSource, kCFRunLoopDefaultMode);
kern_return_t err;
err = IOServiceAddMatchingNotification(notificationPort,
kIOMatchedNotification,
(__bridge CFDictionaryRef)matchingDict,
usbDeviceAppeared,
(__bridge void *)self,
&newDevicesIterator);
if (err)
{
NSLog(@"error adding publish notification");
}
[self matchingDevicesAdded: newDevicesIterator];
NSMutableDictionary *matchingDictRemoved = (__bridge NSMutableDictionary *)IOServiceMatching(kIOUSBDeviceClassName);
if (matchingDictRemoved == nil){
NSLog(@"Could not create matching dictionary");
return;
}
[matchingDictRemoved setObject:[NSNumber numberWithShort:matchVendorID] forKey:(NSString *)CFSTR(kUSBVendorID)];
[matchingDictRemoved setObject:[NSNumber numberWithShort:matchProductID] forKey:(NSString *)CFSTR(kUSBProductID)];
err = IOServiceAddMatchingNotification(notificationPort,
kIOTerminatedNotification,
(__bridge CFDictionaryRef)matchingDictRemoved,
usbDeviceDisappeared,
(__bridge void *)self,
&lostDevicesIterator);
if (err)
{
NSLog(@"error adding removed notification");
}
[self matchingDevicesRemoved: lostDevicesIterator];
// CFRunLoopRun();
// [[NSRunLoop currentRunLoop] run];
}
#pragma mark -
#pragma mark ObjC Callback functions
#pragma mark -
- (void)matchingDevicesAdded:(io_iterator_t)devices
{
io_object_t thisObject;
while ( (thisObject = IOIteratorNext(devices))) {
NSLog(@"new Matching device added ");
IOObjectRelease(thisObject);
}
}
- (void)matchingDevicesRemoved:(io_iterator_t)devices
{
io_object_t thisObject;
while ( (thisObject = IOIteratorNext(devices))) {
NSLog(@"A matching device was removed ");
IOObjectRelease(thisObject);
}
}
@end