访问鼠标&键盘电池状态通过API

时间:2010-08-23 14:03:36

标签: macos keyboard mouse power-management

我想为Mac编写一个小应用程序,我需要通过蓝牙连接鼠标和键盘的电池百分比。任何人都可以告诉我是否有一些API来做到这一点?

1 个答案:

答案 0 :(得分:1)

我知道这有点晚了,在您提出问题后超过18个月,但这里有一些我在电池状态中使用的代码:

mach_port_t     masterPort;
kern_return_t   kr;
io_iterator_t   ite;
io_object_t     obj = 0;
CFMutableDictionaryRef  properties;

kr = IOMasterPort(bootstrap_port, &masterPort);
if (kr != KERN_SUCCESS)
    printf("IOMasterPort() failed: %x\n", kr);

kr = IORegistryCreateIterator(masterPort,
                              kIOServicePlane,
                              true,
                              &ite);

while ((obj = IOIteratorNext(ite)))
{
    kr = IORegistryEntryCreateCFProperties(obj,
                                           &properties,
                                           kCFAllocatorDefault,
                                           kNilOptions);

    if ((kr != KERN_SUCCESS) || !properties) {
        printf("IORegistryEntryCreateCFProperties error %x\n", kr);
    }

    else
    {
        CFNumberRef percent = (CFNumberRef) CFDictionaryGetValue(properties, CFSTR("BatteryPercent"));
        if (percent)
        {
            SInt32 s;
            if(!CFNumberGetValue(percent, kCFNumberSInt32Type, &s))
            {
                printf("***CFNumber overflow***\n");
            }

            else
            {
                NSDictionary *deviceProperties = (__bridge NSDictionary *)properties;
                //Use the key @"BatteryPercent" in this dictionary to access the battery percent of any bluetooth mouse, keyboard, or trackpad connected.
            }
        }
    }
}

希望有帮助...如果您使用聚光灯找到应用程序IORegistryExplorer,这可以帮助找出哪些其他键可能在字典中使用以查找其他有用信息(如设备的名称或类型) 。)