获取显示亮度
答
经过一番搜索和摆弄之后,这里有一个“未来证明”的方法来获得不使用OS X 10.9中弃用的CGDisplayIOServicePort的显示亮度。
- (float)getDisplayBrightness
{
float brightness = 1.0f;
io_iterator_t iterator;
kern_return_t result =
IOServiceGetMatchingServices(kIOMasterPortDefault,
IOServiceMatching("IODisplayConnect"),
&iterator);
// If we were successful
if (result == kIOReturnSuccess)
{
io_object_t service;
while ((service = IOIteratorNext(iterator)))
{
IODisplayGetFloatParameter(service,
kNilOptions,
CFSTR(kIODisplayBrightnessKey),
&brightness);
// Let the object go
IOObjectRelease(service);
}
}
return brightness;
}