从 IOKit (CoreFoundation) 接收插入设备的通知时出现问题

发布于 2024-11-01 00:42:43 字数 1222 浏览 5 评论 0原文

我目前正在 10.6.7 上开发一个应用程序，当插入新的 USB 设备时，它应该收到通知。我发现有一个 IOKit 函数可以处理“IOServiceAddMatchingNotification”等内容。因为这个特定函数的返回值是 0，所以我认为问题可能出在我的匹配字典中，该字典被赋予这个函数。我这样声明字典：

CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOUSBDeviceClassName);

因为我不想收到每个设备的通知，所以我不知道这是否是创建这个特定字典的正确方法。

我的完整代码如下所示：

ioKitNotificationPort = IONotificationPortCreate(kIOMasterPortDefault);
notificationRunLoopSource = IONotificationPortGetRunLoopSource(ioKitNotificationPort);

CFRunLoopAddSource(CFRunLoopGetCurrent(), notificationRunLoopSource, kCFRunLoopDefaultMode);

CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOUSBDeviceClassName);


addMatchingNotificationResult = IOServiceAddMatchingNotification(ioKitNotificationPort,
                                                                 kIOPublishNotification,
                                                                 matchingDict,
                                                                 deviceAdded,
                                                                 NULL,

有谁知道为什么这不起作用？（注：Callback函数是一个static void c函数，其余的被包装在ins中 ide 是一个 Obj-C 类）。

感谢

Xcode 4、10.6.7

原文

I'm currently developing an application on 10.6.7 which should receive notifications when a new usb device is plugged in. I found out that there is a IOKit function which handles such stuff 'IOServiceAddMatchingNotification'. Because the return value from this specific function is 0, I think that the problem perhaps is in my matching Dictionary, which is given into this function. I declare the Dictionary that way:

CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOUSBDeviceClassName);

Because I wan't to receive a notification for each device, I don't know if this is the right way to create this particular dictionary.

My complete code look like this:

ioKitNotificationPort = IONotificationPortCreate(kIOMasterPortDefault);
notificationRunLoopSource = IONotificationPortGetRunLoopSource(ioKitNotificationPort);

CFRunLoopAddSource(CFRunLoopGetCurrent(), notificationRunLoopSource, kCFRunLoopDefaultMode);

CFMutableDictionaryRef matchingDict = IOServiceMatching(kIOUSBDeviceClassName);


addMatchingNotificationResult = IOServiceAddMatchingNotification(ioKitNotificationPort,
                                                                 kIOPublishNotification,
                                                                 matchingDict,
                                                                 deviceAdded,
                                                                 NULL,

Does anyone has a idea why this won't work?
(Note: The Callback function is a static void c function and the rest is wrapped ins
ide a Obj-C class).

Thanks

Xcode 4, 10.6.7

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牵强ㄟ 2024-11-08 00:42:43

奇怪的是，在通知被武装之前，您必须清空 IOServiceAddMatchingNotification 返回的迭代器。我在提供的代码中没有看到这一点，因此这可能是问题所在。实际上，您需要保留该迭代器来保持通知运行。

io_iterator_t ioNotification;

addMatchingNotificationResult = IOServiceAddMatchingNotification(ioKitNotificationPort,
                                                                 kIOPublishNotification,
                                                                 matchingDict,
                                                                 deviceAdded,
                                                                 NULL,
                                                                 &ioNotification);

while ((service = IOIteratorNext(ioNotification)))
{
    NSLog(@"Hey, I found a service!");

    IOObjectRelease(service); // yes, you have to release this
}

Weirdly, you must empty the iterator returned by IOServiceAddMatchingNotification before the notification will be armed. I don't see that in the code provided, so that could be in the issue. That iterator is actually what you need to keep around to keep the notification running.

io_iterator_t ioNotification;

addMatchingNotificationResult = IOServiceAddMatchingNotification(ioKitNotificationPort,
                                                                 kIOPublishNotification,
                                                                 matchingDict,
                                                                 deviceAdded,
                                                                 NULL,
                                                                 &ioNotification);

while ((service = IOIteratorNext(ioNotification)))
{
    NSLog(@"Hey, I found a service!");

    IOObjectRelease(service); // yes, you have to release this
}

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把回忆走一遍 2024-11-08 00:42:43

在我看来，你应该在 opensource.apple.com 上下载 IOUSBFamily 的源代码，然后找到 USB Prober 的代码，这个应用程序的作用与你描述的完全相同，监听 USB 设备（此外，USB Prober还获取通用设备和配置描述符，也许这也是您需要的东西。）

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记忆里有你的影子 2024-11-08 00:42:43

您是否已将要查找的设备的 VID 和 PID 添加到匹配字典中？对于您拥有的字典，并且 VID= yourVid，PID= yourPid，这将是：

CFDictionaryAddValue(matchingDict, usbVendorId, yourVid);  
CFDictionaryAddValue(matchingDict, usbProductId, yourPid);

另一件事 - 在成功调用 IOServiceAddMatchingNotification 后，您需要使用在调用中设置的迭代器来调用设备添加的处理程序。这将启动通知并检查现有设备。

Did you add the VID and PID of the device you wish to look for to your matching dictionary? For the dictionary you have, and VID= yourVid, PID= yourPid, it would be:

CFDictionaryAddValue(matchingDict, usbVendorId, yourVid);  
CFDictionaryAddValue(matchingDict, usbProductId, yourPid);

Another thing - after the call to IOServiceAddMatchingNotification succeeds, you need to call your device-added handler with the iterator that was set in the call. That will arm the notification and check for existing devices.

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淡淡の花香 2024-11-08 00:42:43

执行我认为您所描述的操作的最简单方法是连接到磁盘仲裁框架。 DA 对于 OSX 来说相对较新，允许用户态应用程序在设备连接时检查设备。它用于在连接 iPod 时打开 iTunes、在连接相机时启动 iPhoto 等等...如果您正在寻找的 USB 设备是存储设备，那么这将适合您。否则你将需要走匹配的字典路线......

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