SocketScan Getting the Battery Level in Swift

问题

Whatever I seem to try I cannot currently get back the Battery level from the iOS/SocketScan API. I am using version 10.3.36, here is my code so far:

func onDeviceArrival(result: SKTRESULT, device deviceInfo: DeviceInfo!) {
    print("onDeviceArrival:\(deviceInfo.getName())")
scanApiHelper.postGetBattery(deviceInfo, target: self, response: #selector(onGetBatteryInfo))

}

func onGetBatteryInfo(scanObj: ISktScanObject) {

    let result:SKTRESULT = scanObj.Msg().Result()
    print("GetBatteryInfo status:\(result)")

    if (result == ESKT_NOERROR) {
        let batterylevel = scanObj.Property().getUlong()
        print("Battery is:\(batterylevel)")
    } else {
        print("Error GetBatteryInfo status:\(result)")
    }

However, the values I get back are:

GetBatteryInfo status:0

Battery is:1677741312

If my code is correct then how do I make the Battery result I get back a meaningful result, like a percentage?
If I'm way off then how do I get back info like the battery level, firmware version etc?

Thanks

David

回答1:

EDIT: SKTBATTERY_GETCURLEVEL isn't supported in Swift. However, the docs explain that the battery level response includes the min, current and max levels encoded in the first, second and third bytes, respectively.

The following is equivalent to using SKTBATTERY_GETCURLEVEL

Swift

func onGetBatteryInfo(scanObj: ISktScanObject) {

    let result:SKTRESULT = scanObj.Msg().Result()

    if(SKTSUCCESS(result)){

        let batteryInfo = scanObj.Property().getUlong();

        let batteryMin = ((batteryInfo >> 4) & 0xff);
        let batteryCurrent = ((batteryInfo >> 8) & 0xff);
        let batteryMax = ((batteryInfo >> 12) & 0xff);

        let batteryPercentage = batteryCurrent / (batteryMax - batteryMin);
        print("Battery is:\(batteryPercentage)")

        self.setBatteryLevel = batteryPercentage
        self.tableView.reloadData

    } else {

        print("Error GetBatteryInfo status:\(result)")
    }
}

Objective-C

-(void) onGetBatteryInfo:(ISktScanObject*)scanObj {

SKTRESULT result=[[scanObj Msg]Result];
if(SKTSUCCESS(result)){

    long batteryLevel = SKTBATTERY_GETCURLEVEL([[scanObj Property] getUlong]);
    NSLog(@"BatteryInfo %ld", batteryLevel);

    [self setBatteryLevel:batteryLevel];
    [self.tableView reloadData];

} else {

    NSLog(@"Error GetBatteryInfo status: %ld",result);
}
}

回答2:

Here's code I use. Theres a variable defined in appDelegate for the batteryPercentage, and that is read when the v value is needed. The value is updated each 120 seconds by a timer, this way actions can occur as the level drops etc.

 func onBatteryLevel (scanObj: ISktScanObject) {
    let result: SKTRESULT = scanObj.Msg().Result()
    if (SKTRESULT(result) > -1) {
        let property: ISktScanProperty = scanObj.Property()
        var batteryLevel = property.getUlong()

        #if arch(x86_64) || arch(arm64)
            batteryLevel = (batteryLevel<<(48))>>(56)
            #else
            batteryLevel = (batteryLevel<<(48-32))>>(56-32)
        #endif
        batteryPercentage = Int(batteryLevel)
    } else {
        debug ("data error \(result)")
    }
}

回答3:

For Swift 4 I just came across this problem and came up with the following solution.

var lastDeviceConnected : CaptureHelperDevice? {

    didSet {

        guard let lastDevice = self.lastDeviceConnected else { return }
        lastDevice.getBatteryLevelWithCompletionHandler { result, batteryLevel in

            guard result == SKTResult.E_NOERROR, let batteryLevel = batteryLevel else { return }

            let minimum = SKTHelper.getMinimumLevel(fromBatteryLevel: Int(batteryLevel))
            let maximum = SKTHelper.getMaximumLevel(fromBatteryLevel: Int(batteryLevel))
            let current = SKTHelper.getCurrentLevel(fromBatteryLevel: Int(batteryLevel))

            print("minimum: \(minimum)")
            print("maximum: \(maximum)")
            print("current: \(current)")

            // current is out battery level in %
            // minimum and maximum could for example be used for 
            // for a slider or something that visually presents
            // the battery status
        }
    }
}

In my example I'm not handling the case that there could be no device or that the battery status might not have been retrieved as expected. I simply guard / return. In your example you might want to handle the issue.

来源：https://stackoverflow.com/questions/38254425/socketscan-getting-the-battery-level-in-swift

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swift

socketscan