调整不工作

Question

我正在尝试挂钩IOKit框架（ios 10）来更改我的序列号 建立成功，但当我在我的设备上测试结果仍然是我的真实序列号 谁知道为什么？ 这是我的源代码

#import <substrate.h>


typedef mach_port_t io_object_t;
typedef io_object_t io_registry_entry_t;
typedef UInt32 IOOptionBits;

extern "C" CFTypeRef IORegistryEntryCreateCFProperty(io_registry_entry_t entry, CFStringRef key, CFAllocatorRef allocator, IOOptionBits options);



static CFTypeRef (*orig_registryEntry)(io_registry_entry_t entry,  CFStringRef key, CFAllocatorRef allocator, IOOptionBits options);

CFTypeRef replaced_registryEntry(io_registry_entry_t entry,  CFStringRef key, CFAllocatorRef allocator, IOOptionBits options) {
    CFTypeRef retval = NULL;

    if(key == CFSTR("IOPlatformSerialNumber")){
        retval = CFDataCreate(kCFAllocatorDefault, (const unsigned char *)"F17JBBBBAAAA", 12);
    }
    else
        retval = orig_registryEntry(entry, key, allocator, options);

    return retval;
}


%ctor
{
    MSHookFunction((void *)IORegistryEntryCreateCFProperty, (void *)replaced_registryEntry, (void **)&orig_registryEntry);
    %init();
}