本文介绍了如何在macOS下找到串行端口的父USB设备?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
这是我尝试枚举Mac上找到的所有串行端口并遍历设备节点树以找到USB串行适配器的父USB设备的方式:
Here is how I was trying to enumerate all serial ports found on a Mac, and traverse up the device node tree to find the parent USB device for USB-serial adapters:
#import <Foundation/Foundation.h>
#import <IOKit/IOKitLib.h>
#import <IOKit/serial/IOSerialKeys.h>
#import <IOKit/usb/IOUSBLib.h>
int main(int argc, const char * argv[])
{
@autoreleasepool
{
CFMutableDictionaryRef keywordDict = IOServiceMatching(kIOSerialBSDServiceValue);
io_object_t port = 0;
io_iterator_t iterator = 0;
kern_return_t result = IOServiceGetMatchingServices(kIOMasterPortDefault, keywordDict, &iterator);
if (result)
{
NSLog(@"Failed to find any serial ports.");
exit(EXIT_FAILURE);
}
while ((port = IOIteratorNext(iterator)))
{
@autoreleasepool
{
NSMutableArray<NSDictionary *> *array = [NSMutableArray array];
CFMutableDictionaryRef dict = NULL;
result = IORegistryEntryCreateCFProperties(port, &dict, kCFAllocatorDefault, 0);
if (!result)
[array addObject:CFBridgingRelease(dict)];
io_object_t parent = 0;
io_object_t parents = port;
while (IORegistryEntryGetParentEntry(parents, kIOServicePlane, &parent))
{
result = IORegistryEntryCreateCFProperties(parent, &dict, kCFAllocatorDefault, 0);
if (!result)
[array addObject:CFBridgingRelease(dict)];
if (parents != port)
IOObjectRelease(parents);
parents = parent;
}
NSLog(@"0x%08lx = %@", (uintptr_t)port, array);
}
}
}
return 0;
}
尽管此代码可以找到所有串行端口(包括USB串行适配器和我的Hackintosh上的Super IO)，但遍历IOService树无法正常工作.帮助?目标操作系统是macOS 10.13.6.
However while this code can find all serial ports (both USB-serial adapters and the Super IO one on my Hackintosh,) the traverse up the IOService tree isn't working. Help? Target OS is macOS 10.13.6.
这是我的一个USB串行适配器的输出:
Here is the output for one of my USB-Serial adapters:
2018-08-18 19:05:39.860794+0800 lstty[98738:5197725] 0x00002a07 = (
{
CFBundleIdentifier = "com.apple.iokit.IOSerialFamily";
IOCalloutDevice = "/dev/cu.usbmodem1751";
IOClass = IOSerialBSDClient;
IODialinDevice = "/dev/tty.usbmodem1751";
IOGeneralInterest = "IOCommand is not serializable";
IOMatchCategory = IODefaultMatchCategory;
IOProbeScore = 1000;
IOProviderClass = IOSerialStreamSync;
IOResourceMatch = IOBSD;
IOSerialBSDClientType = IOModemSerialStream;
IOTTYBaseName = usbmodem;
IOTTYDevice = usbmodem1751;
IOTTYSuffix = 1751;
}
)
以下是同一设备的ioreg -itrc IOSerialBSDClient -w0输出:
Here is the ioreg -itrc IOSerialBSDClient -w0 output for the same device:
+-o Root <class IORegistryEntry, id 0x100000100, retain 15>
+-o iMac14,2 <class IORegistryEntry:IOService:IOPlatformExpertDevice, id 0x100000110, registered, matched, active, busy 0 (51894 ms), retain 45>
+-o AppleACPIPlatformExpert <class IORegistryEntry:IOService:IOPlatformExpert:IODTPlatformExpert:IOACPIPlatformExpert:AppleACPIPlatformExpert, id 0x100000111, registered, matched, active, busy 0 (41509 ms), retain 50>
+-o PCI0@0 <class IORegistryEntry:IOService:IOPlatformDevice:IOACPIPlatformDevice, id 0x10000013e, registered, matched, active, busy 0 (41377 ms), retain 54>
+-o AppleACPIPCI <class IORegistryEntry:IOService:IOPCIBridge:AppleACPIPCI, id 0x100000216, registered, matched, active, busy 0 (41332 ms), retain 31>
+-o XHC@14 <class IORegistryEntry:IOService:IOPCIDevice, id 0x1000001f0, registered, matched, active, busy 0 (35582 ms), retain 11>
+-o XHC@14000000 <class IORegistryEntry:IOService:AppleUSBHostController:AppleUSBXHCI:AppleUSBXHCIPCI:AppleUSBXHCILPT:AppleUSBXHCILPTH:AppleUSBXHCILPTHB, id 0x10000023d, registered, matched, active, busy 0 (35072 ms), retain 1249>
+-o HS10@14a00000 <class IORegistryEntry:IOService:AppleUSBHostPort:AppleUSBXHCIPort:AppleUSB20XHCIPort, id 0x100000277, registered, matched, active, busy 0 (22180 ms), retain 17>
+-o IOUSBHostDevice@14a00000 <class IORegistryEntry:IOService:IOUSBNub:IOUSBDevice, id 0x100007a40, registered, matched, active, busy 0 (1604 ms), retain 31>
+-o AppleUSB20Hub@14a00000 <class IORegistryEntry:IOService:AppleUSBHub:AppleUSB20Hub, id 0x100007a4e, registered, matched, active, busy 0 (1600 ms), retain 23>
+-o AppleUSB20HubPort@14a10000 <class IORegistryEntry:IOService:AppleUSBHostPort:AppleUSBHubPort:AppleUSB20HubPort, id 0x100007a52, registered, matched, active, busy 0 (964 ms), retain 17>
+-o IOUSBHostDevice@14a10000 <class IORegistryEntry:IOService:IOUSBNub:IOUSBDevice, id 0x1000082bb, registered, matched, active, busy 0 (323 ms), retain 32>
+-o AppleUSB20Hub@14a10000 <class IORegistryEntry:IOService:AppleUSBHub:AppleUSB20Hub, id 0x1000082d4, registered, matched, active, busy 0 (316 ms), retain 23>
+-o AppleUSB20HubPort@14a12000 <class IORegistryEntry:IOService:AppleUSBHostPort:AppleUSBHubPort:AppleUSB20HubPort, id 0x1000082d8, registered, matched, active, busy 0 (269 ms), retain 17>
+-o ComboDebug USB Serial@14a12000 <class IORegistryEntry:IOService:IOUSBNub:IOUSBDevice, id 0x10000837e, registered, matched, active, busy 0 (268 ms), retain 28>
+-o IOUSBHostInterface@1 <class IORegistryEntry:IOService:IOUSBNub:IOUSBInterface, id 0x100008390, registered, matched, active, busy 0 (259 ms), retain 8>
+-o AppleUSBACMData <class IORegistryEntry:IOService:IOSerialDriverSync:AppleUSBACMData, id 0x1000083a0, registered, matched, active, busy 0 (1 ms), retain 6>
+-o IOModemSerialStreamSync <class IORegistryEntry:IOService:IOSerialStreamSync:IOModemSerialStreamSync, id 0x100008417, registered, matched, active, busy 0 (1 ms), retain 6>
+-o IOSerialBSDClient <class IORegistryEntry:IOService:IOSerialBSDClient, id 0x100008418, registered, matched, active, busy 0 (0 ms), retain 5>
{
"IOClass" = "IOSerialBSDClient"
"CFBundleIdentifier" = "com.apple.iokit.IOSerialFamily"
"IOProviderClass" = "IOSerialStreamSync"
"IOTTYBaseName" = "usbmodem"
"IOSerialBSDClientType" = "IOModemSerialStream"
"IOProbeScore" = 1000
"IOCalloutDevice" = "/dev/cu.usbmodem1751"
"IODialinDevice" = "/dev/tty.usbmodem1751"
"IOMatchCategory" = "IODefaultMatchCategory"
"IOTTYDevice" = "usbmodem1751"
"IOResourceMatch" = "IOBSD"
"IOGeneralInterest" = "IOCommand is not serializable"
"IOTTYSuffix" = "1751"
}
推荐答案
提早终止的问题是循环的退出条件:
Your problem with the early termination is the exit condition for your loop:
while (IORegistryEntryGetParentEntry(parents, kIOServicePlane, &parent))
IORegistryEntryGetParentEntry()返回一个kern_return_t-KERN_SUCCESS为0，因此这意味着while条件的计算结果为false，并且循环永不运行.试试
IORegistryEntryGetParentEntry() returns a kern_return_t - KERN_SUCCESS is 0, so this means the while condition evaluates to false and the loop never runs. Try
while (KERN_SUCCESS == IORegistryEntryGetParentEntry(parents, kIOServicePlane, &parent))
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