返回的能力价值观，而不是百分比

Question

使用这种方法在这里，我会怎么回curCapacity和maxCapacity马的价值观，而不是一个百分点？

http://blog.coriolis.ch/2009/02/14/reading-the-battery-level-programmatically/comment-page-1/#comment-6089

无论我怎么试我的curCapacity和maxCapacity值的比赛我的电池百分比！

我的第1次尝试

#include "IOPowerSources.h"
#include "IOPSKeys.h"

- (double) batteryLevel // Find current charge percentage
{
#if TARGET_IPHONE_SIMULATOR
    return 80.0f;
#else
    CFTypeRef blob = IOPSCopyPowerSourcesInfo();
    CFArrayRef sources = IOPSCopyPowerSourcesList(blob);

    CFDictionaryRef pSource = NULL;
    const void *psValue;

    int numOfSources = CFArrayGetCount(sources);
    if (numOfSources == 0) {
        NSLog(@"Error in CFArrayGetCount");
        return -1.0f;
    }

    for (int i = 0 ; i < numOfSources ; i++)
    {
            pSource = IOPSGetPowerSourceDescription(blob,     CFArrayGetValueAtIndex(sources, i));
        if (!pSource) {
            NSLog(@"Error in IOPSGetPowerSourceDescription");
            return -1.0f;
        }
        psValue = (CFStringRef)CFDictionaryGetValue(pSource, CFSTR(kIOPSNameKey));

        int curCapacity = 0;
        int maxCapacity = 0;
        double percent;

        psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSCurrentCapacityKey));
        CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &curCapacity);

        psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSMaxCapacityKey));
        CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &maxCapacity);

        percent = ((double)curCapacity/(double)maxCapacity * 100.0f);

        return percent;
    }
    return -1.0f;
#endif
}


#include "IOPowerSources.h"
#include "IOPSKeys.h"

- (double) curCapacity // Find current capacity
{
#if TARGET_IPHONE_SIMULATOR
    return 460;
    #else
    CFTypeRef blob = IOPSCopyPowerSourcesInfo();
    CFArrayRef sources = IOPSCopyPowerSourcesList(blob);

    CFDictionaryRef pSource = NULL;
    const void *psValue;

    int numOfSources = CFArrayGetCount(sources);
    if (numOfSources == 0) {
        NSLog(@"Error in CFArrayGetCount");
        return -1.0f;
    }

    for (int i = 0 ; i < numOfSources ; i++)
    {
        pSource = IOPSGetPowerSourceDescription(blob,     CFArrayGetValueAtIndex(sources, i));
        if (!pSource) {
            NSLog(@"Error in IOPSGetPowerSourceDescription");
            return -1.0f;
        }
        psValue = (CFStringRef)CFDictionaryGetValue(pSource, CFSTR(kIOPSNameKey));

        int curCapacity = 0;
        int maxCapacity = 0;
        double curCapacityVal;

        psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSCurrentCapacityKey));
        CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &curCapacity);

        psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSMaxCapacityKey));
        CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &maxCapacity);

        curCapacityVal = (double)curCapacity;

        return curCapacityVal;
    }
    return -1.0f;
#endif
}




#include "IOPowerSources.h"
#include "IOPSKeys.h"

- (double) maxCapacity // Find maximum capacity
{
#if TARGET_IPHONE_SIMULATOR
    return 780;
#else
    CFTypeRef blob = IOPSCopyPowerSourcesInfo();
    CFArrayRef sources = IOPSCopyPowerSourcesList(blob);

    CFDictionaryRef pSource = NULL;
    const void *psValue;

    int numOfSources = CFArrayGetCount(sources);
    if (numOfSources == 0) {
        NSLog(@"Error in CFArrayGetCount");
        return -1.0f;
    }

    for (int i = 0 ; i < numOfSources ; i++)
    {
        pSource = IOPSGetPowerSourceDescription(blob,     CFArrayGetValueAtIndex(sources, i));
        if (!pSource) {
            NSLog(@"Error in IOPSGetPowerSourceDescription");
            return -1.0f;
        }
        psValue = (CFStringRef)CFDictionaryGetValue(pSource, CFSTR(kIOPSNameKey));

        int curCapacity = 0;
        int maxCapacity = 0;
        double maxCapacityVal;

        psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSCurrentCapacityKey));
        CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &curCapacity);

        psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSMaxCapacityKey));
        CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &maxCapacity);

        maxCapacityVal = (double)maxCapacity;

        return maxCapacityVal;

    }
    return -1.0f;
#endif
}

Answer 1

我已经改变的方法返回的字典:

#include "IOPowerSources.h"
#include "IOPSKeys.h"

- (NSDictionary *) batteryData
{
  CFTypeRef blob = IOPSCopyPowerSourcesInfo();
  CFArrayRef sources = IOPSCopyPowerSourcesList(blob);

  CFDictionaryRef pSource = NULL;
  const void *psValue;

  int numOfSources = CFArrayGetCount(sources);
  if (numOfSources == 0) {
    NSLog(@"Error in CFArrayGetCount");
      return [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:-1], @"curCapacity", [NSNumber numberWithInt:-1], @"maxCapacity", nil];;
  }

  for (int i = 0 ; i < numOfSources ; i++)
  {
    pSource = IOPSGetPowerSourceDescription(blob, CFArrayGetValueAtIndex(sources, i));
    if (!pSource) {
      NSLog(@"Error in IOPSGetPowerSourceDescription");
          return [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:-1], @"curCapacity", [NSNumber numberWithInt:-1], @"maxCapacity", nil];;
    }
    psValue = (CFStringRef)CFDictionaryGetValue(pSource, CFSTR(kIOPSNameKey));

    int curCapacity = 0;
    int maxCapacity = 0;
    double percent;

    psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSCurrentCapacityKey));
    CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &curCapacity);

    psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSMaxCapacityKey));
    CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &maxCapacity);

    percent = ((double)curCapacity/(double)maxCapacity * 100.0f);

    return [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:curCapacity], @"curCapacity", [NSNumber numberWithInt:maxCapacity], @"maxCapacity", nil];
  }
  return [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:-1], @"curCapacity", [NSNumber numberWithInt:-1], @"maxCapacity", nil];;
}

Answer 2

好吧，作为书面回返的只有一个单独的双代表错误或百分比。返回的流和最大capcities你会需要改写功能返回多的价值，像这样：

-(double) batteryLevel(**currentCapacity,**maxCapacity){...}

或者分成三个独立的职能的每一个要求一个单独的IOPower功能为每个能力要求。

Answer 3

从常量 IOPSKeys.h, 它也许不可能得到原马的价值的电池。

电源的软件的可能指定的单位这个关键。该单位必须consisent的所有能力报告这一电源。客户可以得出一个百分比的电源电池中的剩余通过将"流量"，由"最大能力"