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////  main.c//  DriverIterator//#include <CoreFoundation/CoreFoundation.h>#include <IOKit/IOKitLib.h>void DeviceAdded (void* refCon, io_iterator_t iterator)
{
    io_service_t        service = 0;    // 迭代所有匹配对象    while ((service = IOIteratorNext(iterator)) != 0)
    {        CFStringRef className;        //列出所有的IOUSBDevice对象 ，忽略IOUSBDevice的子类对象
        className = IOObjectCopyClass(service);        if (CFEqual(className, CFSTR(""IOUSBDevice"")) == true)
        {            CFTypeRef       vendorName;

            vendorName = IORegistryEntryCreateCFProperty(service, CFSTR(""USB Vendor Name""), kCFAllocatorDefault, 0);            CFShow(vendorName);
        }        CFRelease(className);
        IOObjectRelease(service);
    }
}int main (int argc, const char * argv[])
{    CFDictionaryRef         matchingDict = NULL;
    io_iterator_t           iter = 0;
    IONotificationPortRef   notificationPort = NULL;    CFRunLoopSourceRef      runLoopSource;
    kern_return_t           kr;    //创建一个匹配字典，用于查找任意的 USB 设备
    matchingDict = IOServiceMatching(""IOUSBDevice"");

    notificationPort = IONotificationPortCreate(kIOMasterPortDefault);
    runLoopSource = IONotificationPortGetRunLoopSource(notificationPort);    CFRunLoopAddSource(CFRunLoopGetCurrent(), runLoopSource, kCFRunLoopDefaultMode);

    kr = IOServiceAddMatchingNotification(notificationPort, kIOFirstMatchNotification, matchingDict, DeviceAdded, NULL, &iter);
    DeviceAdded(NULL, iter);    CFRunLoopRun();

    IONotificationPortDestroy(notificationPort);

    IOObjectRelease(iter);    return 0;
}

Apple Inc.
Apple Inc.
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Kingston

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