macos – IOKit设备添加删除通知 – 只触发一次？

概述我一直在尝试在添加或删除特定USB设备时收到通知.我已阅读“从应用程序访问硬件”文档并拥有一个简单的演示应用程序,主要基于该文档中提供的代码. 它是第一次添加或删除设备时工作,但之后我的回调永远不会被调用.我弄不清楚为什么？谁能发现我哪里错了？ (xcode项目,如果你想测试) http://monkeyfood.com/testIOKitNOtificaiton.zip 谢谢. //// A 我一直在尝试在添加或删除特定USB设备时收到通知.我已阅读“从应用程序访问硬件”文档并拥有一个简单的演示应用程序,主要基于该文档中提供的代码.

它是第一次添加或删除设备时工作,但之后我的回调永远不会被调用.我弄不清楚为什么？谁能发现我哪里错了？

(xcode项目,如果你想测试)@H_419_12@http://monkeyfood.com/testIOKitNOtificaiton.zip

谢谢.

////  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,&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

解决方法 我弄清楚了什么是错的 – 我没有对C Callback中的迭代器做任何事情.一个愚蠢的错误！ 总结

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