我没有完整的答案,但实现您想要的功能的程序是 USB Prober,随 Xcode 提供并位于/Developer/Applications/Utilities/USB Prober.app
。该程序是开源的,浏览器可查看存储库here整个项目被纳入这个下载。我实际上发现旧版本更有帮助(可用)here, 尤其总线探针类.
它们都依赖于 IOKit,而 Apple 的文档似乎在数量和质量上都非常缺乏。
这是大量的阅读,但如果你检查一下+ USBProbe
然后你会看到它获取当前 USB 设备的列表,获取IOUSBDeviceInterface
s 代表变量中的每个deviceIntf
然后将它们推送到对程序的其余部分有用的地方。如果你签出+ outputDevice: locationID:deviceNumber:
在同一个源文件中,你会看到GetDescriptor
似乎可以用在IOUSBDeviceDescriptor
获取包括供应商和产品 ID 在内的属性,USB 实施者论坛保证其组合是唯一的。
使用供应商和产品 ID,您可以搜索任何特定的 USB 设备。从我的 Mac 系统信息中,我可以告诉您 iPhone 4 的产品 ID 为 0x1297,Apple 的供应商 ID 为 0x05ac。
额外:通过剖析该代码,如果您删除一大堆检查是否成功的检查并将其全部压缩为演示性内容,那么以下至少是一个测试 iPhone 4 现在是否已插入的测试(您需要链接到 Foundation 和 IOKit 框架):
#include <stdio.h>
#import <Foundation/Foundation.h>
#import <IOKit/usb/IOUSBLib.h>
#import <IOKit/IOCFPlugIn.h>
#import <mach/mach_port.h>
int main (int argc, const char * argv[])
{
// get the port through which to talk to the kernel
mach_port_t masterDevicePort;
IOMasterPort(MACH_PORT_NULL, &masterDevicePort);
// create a dictionary that describes a search
// for services provided by USB
CFDictionaryRef matchingDictionary = IOServiceMatching(kIOUSBDeviceClassName);
// get an iterator for all devices that match
// the dictionary
io_iterator_t deviceIterator;
IOServiceGetMatchingServices(
masterDevicePort,
matchingDictionary,
&deviceIterator);
// iterate through the iterator...
io_service_t ioDevice;
while((ioDevice = IOIteratorNext(deviceIterator)))
{
IOUSBDeviceInterface **deviceInterface = NULL;
IOCFPlugInInterface **ioPlugin = NULL;
SInt32 score;
// get a pointer to the device, stored to ioPlugin
IOCreatePlugInInterfaceForService(
ioDevice,
kIOUSBDeviceUserClientTypeID,
kIOCFPlugInInterfaceID,
&ioPlugin,
&score);
// ask the device for its interface
(*ioPlugin)->QueryInterface(
ioPlugin,
CFUUIDGetUUIDBytes(kIOUSBDeviceInterfaceID),
(void *)&deviceInterface);
// make and issue a request to get the device descriptor
IOUSBDeviceDescriptor deviceDescriptor;
IOUSBDevRequest request;
request.bmRequestType = USBmakebmRequestType(kUSBIn, kUSBStandard, kUSBDevice);
request.bRequest = kUSBRqGetDescriptor;
request.wValue = kUSBDeviceDesc << 8;
request.wIndex = 0;
request.wLength = sizeof(deviceDescriptor);
request.pData = &deviceDescriptor;
(*deviceInterface)->DeviceRequest(deviceInterface, &request);
// now we have the device descriptor, do a little cleaning up -
// release the interface and the device
(*deviceInterface)->Release(deviceInterface);
IOObjectRelease(ioDevice);
// ensure that the values returned are in the appropriate
// byte order for this platform
CFSwapInt16LittleToHost(deviceDescriptor.idVendor);
CFSwapInt16LittleToHost(deviceDescriptor.idProduct);
// check whether we have an iPhone 4 attached
if(deviceDescriptor.idVendor == 0x05ac && deviceDescriptor.idProduct == 0x1297)
printf("iPhone 4 is connected!");
}
// clean up by releasing the device iterator
// and returning the communications port
IOObjectRelease(deviceIterator);
mach_port_deallocate(mach_task_self(), masterDevicePort);
return 0;
}
我还没有弄清楚如何观察插入设备的变化。