objective-c - 如何以编程方式调暗 Mac 背光键盘

Question

有没有办法以编程方式使 Mac 上的背光键盘变暗？

Answer 1

UInt64 lightInsideGetLEDBrightness()
{
kern_return_t kr = 0;
IOItemCount   scalarInputCount  = 1;
IOItemCount   scalarOutputCount = 1;
UInt64        in_unknown = 0, out_brightness;
//kr = IOConnectMethodScalarIScalarO(dataPort, kGetLEDBrightnessID,
//                                  scalarInputCount, scalarOutputCount, in_unknown, &out_brightness);
kr = IOConnectCallScalarMethod(dataPort, kGetLEDBrightnessID, &in_unknown, scalarInputCount, &out_brightness, &scalarOutputCount);
return out_brightness;
}

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