使用私有类库自动获取IOS设备序列号

获取设备序列号，需要使用IOKit.framework。但是此类库为私有类库，所以使用的时候需要动态引用。经过测验，发现能够准确取到设备的序列号。代码如下：

- (NSString *) serialNumber
{
	NSString *serialNumber = nil;
	
	void *IOKit = dlopen("/System/Library/Frameworks/IOKit.framework/IOKit", RTLD_NOW);
	if (IOKit)
	{
		mach_port_t *kIOMasterPortDefault = dlsym(IOKit, "kIOMasterPortDefault");
		CFMutableDictionaryRef (*IOServiceMatching)(const char *name) = dlsym(IOKit, "IOServiceMatching");
		mach_port_t (*IOServiceGetMatchingService)(mach_port_t masterPort, CFDictionaryRef matching) = dlsym(IOKit, "IOServiceGetMatchingService");
		CFTypeRef (*IORegistryEntryCreateCFProperty)(mach_port_t entry, CFStringRef key, CFAllocatorRef allocator, uint32_t options) = dlsym(IOKit, "IORegistryEntryCreateCFProperty");
		kern_return_t (*IOObjectRelease)(mach_port_t object) = dlsym(IOKit, "IOObjectRelease");
		
		if (kIOMasterPortDefault && IOServiceGetMatchingService && IORegistryEntryCreateCFProperty && IOObjectRelease)
		{
			mach_port_t platformExpertDevice = IOServiceGetMatchingService(*kIOMasterPortDefault, IOServiceMatching("IOPlatformExpertDevice"));
			if (platformExpertDevice)
			{
				CFTypeRef platformSerialNumber = IORegistryEntryCreateCFProperty(platformExpertDevice, CFSTR("IOPlatformSerialNumber"), kCFAllocatorDefault, 0);
				if (CFGetTypeID(platformSerialNumber) == CFStringGetTypeID())
				{

                    serialNumber = [NSString stringWithString:(__bridge NSString*)platformSerialNumber];

					CFRelease(platformSerialNumber);
				}
				IOObjectRelease(platformExpertDevice);
			}
		}
		dlclose(IOKit);
	}
	
	return serialNumber;
}

在使用这段代码的时候，因为用到了私有类库，所有提交AppStore的时候要做一些混淆。如果不是提交AppStore，则可以放心大胆的使用了

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