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75 lines (55 loc) · 2.08 KB
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#include "BatteryMeter.h"
#include <CoreFoundation/CoreFoundation.h>
#include <CoreFoundation/CFString.h>
#include <IOKit/ps/IOPowerSources.h>
#include <IOKit/ps/IOPSKeys.h>
void Battery_getData(double* level, ACPresence* isOnAC) {
CFTypeRef power_sources = IOPSCopyPowerSourcesInfo();
*level = -1;
*isOnAC = AC_ERROR;
if(NULL == power_sources) {
return;
}
if(power_sources != NULL) {
CFArrayRef list = IOPSCopyPowerSourcesList(power_sources);
CFDictionaryRef battery = NULL;
int len;
if(NULL == list) {
CFRelease(power_sources);
return;
}
len = CFArrayGetCount(list);
/* Get the battery */
for(int i = 0; i < len && battery == NULL; ++i) {
CFDictionaryRef candidate = IOPSGetPowerSourceDescription(power_sources,
CFArrayGetValueAtIndex(list, i)); /* GET rule */
CFStringRef type;
if(NULL != candidate) {
type = (CFStringRef) CFDictionaryGetValue(candidate,
CFSTR(kIOPSTransportTypeKey)); /* GET rule */
if(kCFCompareEqualTo == CFStringCompare(type, CFSTR(kIOPSInternalType), 0)) {
CFRetain(candidate);
battery = candidate;
}
}
}
if(NULL != battery) {
/* Determine the AC state */
CFStringRef power_state = CFDictionaryGetValue(battery, CFSTR(kIOPSPowerSourceStateKey));
*isOnAC = (kCFCompareEqualTo == CFStringCompare(power_state, CFSTR(kIOPSACPowerValue), 0))
? AC_PRESENT
: AC_ABSENT;
/* Get the percentage remaining */
double current;
double max;
CFNumberGetValue(CFDictionaryGetValue(battery, CFSTR(kIOPSCurrentCapacityKey)),
kCFNumberDoubleType, ¤t);
CFNumberGetValue(CFDictionaryGetValue(battery, CFSTR(kIOPSMaxCapacityKey)),
kCFNumberDoubleType, &max);
*level = (current * 100.0) / max;
CFRelease(battery);
}
CFRelease(list);
CFRelease(power_sources);
}
}