AppleUSBCDCACMData IOClass 上的 IOServiceMatching：异常？
我正在尝试使用以下代码片段（只是苹果示例代码中的一些小规模修改）提取我的 mac 中所有 AppleUSBCDCACMData IOClass 设备的列表。该设备是一个 USB 调制解调器，它创建了大约 7 个 /dev/cu.usbmodemx 设备节点。
error = IOMasterPort(MACH_PORT_NULL, &masterPort);
if(error){
return ;
}
else{
matchingDict = IOServiceMatching("AppleUSBCDCACMData");
IOServiceGetMatchingServices(masterPort,matchingDict,&modem_iterator);
while(usbDevice = IOIteratorNext(modem_iterator))
{
}
我的观察是，IOServiceGetMatchingServices 返回的迭代器是空的（即没有可迭代的内容）。但是，如果我将“AppleUSBCDCACMControl”作为参数传递给 IOServiceMatching，我会得到一个包含 7 个元素的列表的迭代器 - 这与 IORegistryExplorer 视图一致。请在此处查看 IORegistryExplorer 的屏幕截图，http://tumblr.deepak.dk/post/1666218968/ioregistryexplorer< /a> 似乎无法使用任意 IOClass 名称字符串查询 IORegistry？因为我也遇到了一些非标准专有 IOClass 的相同问题。 这可以使用任何加载 AppleUSBCDC 驱动程序的 USB 调制解调器 (3g/HSDPA) 来重现。
我做错了什么？
I am trying to extract a list of all AppleUSBCDCACMData IOClass devices in my mac using the following code snippet (just some small scale modifications in apple sample code). The device is a usb modem which creates some 7 /dev/cu.usbmodemx device nodes.
error = IOMasterPort(MACH_PORT_NULL, &masterPort);
if(error){
return ;
}
else{
matchingDict = IOServiceMatching("AppleUSBCDCACMData");
IOServiceGetMatchingServices(masterPort,matchingDict,&modem_iterator);
while(usbDevice = IOIteratorNext(modem_iterator))
{
}
My observation is, the iterator returned by IOServiceGetMatchingServices is empty (ie nothing to iterate on). But if i pass "AppleUSBCDCACMControl" as the parameter to IOServiceMatching, i get a iterator of a list of 7 elements - which is in conformance with the IORegistryExplorer view. See a screenshot of IORegistryExplorer here, http://tumblr.deepak.dk/post/1666218968/ioregistryexplorer
It appears that it is not possible to query IORegistry with arbitrary IOClass name strings? Since i faced the same issues with some non-standard proprietary IOClasses as well.
This can be reproduced using any USB modem (3g/HSDPA) which loads AppleUSBCDC driver.
What am i doing wrong?
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IOService对象只能匹配一次registerService()已为它们调用。AppleUSBCDCACMControl会执行此操作，但AppleUSBCDCACMData不会。IOServiceobjects can only be matched onceregisterService()has been called for them.AppleUSBCDCACMControldoes this, butAppleUSBCDCACMDatadoes not.