使用 IOKit 返回 Mac 的序列号返回 4 个额外字符 [英] Using IOKit to return Mac's Serial number returns 4 extra characters

问题描述

我正在使用 IOKit 并有以下代码，总体思路是将 platformExpert 密钥传递给这个小型核心基础命令行应用程序，并让它打印解码后的字符串.测试用例是序列号".运行时下面的代码如下:

./编译序列号

几乎可以工作，但返回字符串开头的序列号的最后 4 个字符，即对于示例序列，例如 C12D2JMPDDQX，它将返回

DDQXC12D2JMPDDQX

有什么想法吗?

#include #include int main (int argc, const char * argv[]) {CFStringRef 参数 = CFSTR("序列号");如果(参数 [1]){参数 = CFStringCreateWithCString(空值，argv[1],kCFStringEncodingUTF8);}CFDataRef 数据；io_service_t platformExpert = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"));如果(平台专家){数据 = IORegistryEntryCreateCFProperty(platformExpert,范围，kCFAllocatorDefault, 0);}IOObjectRelease(平台专家)；CFIndex bufferLength = CFDataGetLength(data);UInt8 *buffer = malloc(bufferLength);CFDataGetBytes(data, CFRangeMake(0,bufferLength), (UInt8*) buffer);CFStringRef 字符串 = CFStringCreateWithBytes(kCFAllocatorDefault,缓冲，缓冲区长度，kCFStringEncodingUTF8,真的);CFShow(字符串)；返回0；}

解决方案

您可能误解了 serial-number 参数的值.如果我使用 ioreg -f -k serial-number，我会得到这个:

<块引用>

<代码> |序列号"=|00000000: 55 51 32 00 00 00 00 00 00 00 00 00 00 XX XX XX XX UQ2..........XXXX|00000011: XX XX XX XX 55 51 32 00 00 00 00 00 00 00 00 00 00 XXXXUQ2........|00000022:00 00 00 00 00 00 00 00 00 ......

(除了重复的部分，我已经删除了我的 Mac 的序列号.)

显示字符串时看不到空字符，因为它们是空字符.我不知道为什么它看起来像是由空字符分隔的多个字段，但看起来就是这样.

我建议进行进一步调查以确保没有关于如何解释这些数据的规范；如果你没有找到任何东西，我会跳过第一次运行的空值，然后得到所有的东西，直到下一次运行空值.

I'm playing with IOKit and have the following code, the general idea is to pass a platformExpert key to this small core foundation command line application and have it print the decoded string. The test case is "serial-number". The code below when run like:

./compiled serial-number

Almost works but returns the last 4 characters of the serial number at the beginning of the string i.e. for an example serial such as C12D2JMPDDQX it would return

DDQXC12D2JMPDDQX

Any ideas?

#include <CoreFoundation/CoreFoundation.h>
#include <IOKit/IOKitLib.h>

int main (int argc, const char * argv[]) {
    CFStringRef parameter = CFSTR("serial-number");
    if (argv[1]) {
       parameter = CFStringCreateWithCString(
                                 NULL,
                                 argv[1],
                                 kCFStringEncodingUTF8);
    }

    CFDataRef data;

    io_service_t platformExpert = IOServiceGetMatchingService(kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"));
    if (platformExpert)
    {
        data = IORegistryEntryCreateCFProperty(platformExpert,
                                               parameter,
                                               kCFAllocatorDefault, 0);
    }

    IOObjectRelease(platformExpert);
    CFIndex bufferLength = CFDataGetLength(data);  
    UInt8 *buffer = malloc(bufferLength);
    CFDataGetBytes(data, CFRangeMake(0,bufferLength), (UInt8*) buffer);
    CFStringRef string = CFStringCreateWithBytes(kCFAllocatorDefault,
                                                 buffer,
                                                 bufferLength,
                                                 kCFStringEncodingUTF8,
                                                 TRUE);
    CFShow(string);
    return 0;
}

解决方案

You may be misinterpreting the value of the serial-number parameter. If I use ioreg -f -k serial-number, I get this:

    |   "serial-number" = 
    |     00000000: 55 51 32 00 00 00 00 00 00 00 00 00 00 XX XX XX XX UQ2..........XXXX
    |     00000011: XX XX XX XX 55 51 32 00 00 00 00 00 00 00 00 00 00 XXXXUQ2..........
    |     00000022: 00 00 00 00 00 00 00 00 00                         .........

(I've X'd out my Mac's serial number except for the repeated part.)

You don't see the null characters when you show the string because, well, they're null characters. I don't know why it has what seems like multiple fields separated by null characters, but that's what it seems to be.

I recommend doing further investigation to make sure there isn't a specification for how this data is supposed to be interpreted; if you don't find anything, I'd skip through the first run of nulls and get everything after that up to the next run of nulls.

这篇关于使用 IOKit 返回 Mac 的序列号返回 4 个额外字符的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！