1
我试图了解这段代码是如何导致内存泄漏，我很难。从我一直在读的内容来看，ARC不管理CF对象，我必须释放它们。我试过这样做，但根据Apple的仪器工具仍然有泄漏。任何意见将不胜感激...提前致谢内存泄漏与IOPSCopyPowerSourcesInfo（）
- (void) getPowerInfo : (id) sender {
CFTypeRef blob = IOPSCopyPowerSourcesInfo();
CFArrayRef sources = IOPSCopyPowerSourcesList(blob);
CFDictionaryRef pSource = NULL;
const void *psValue;
// if there is no power source
if (CFArrayGetCount(sources) == 0) {
NSLog(@"Number of power sources found: 0; Aborting battery monitoring");
} else { // if there is a power source
// for each power source
for (int i = 0 ; i < CFArrayGetCount(sources) ; i++) {
pSource = IOPSGetPowerSourceDescription(blob, CFArrayGetValueAtIndex(sources, i));
NSString *currentPowerState = CFDictionaryGetValue (pSource, CFSTR (kIOPSPowerSourceStateKey));
if (!pSource) { // if source is nil
NSLog(@"Power source is nil");
} else if ([currentPowerState isEqualToString:@"AC Power"]) { // if source is adapter
NSLog(@"Mac is plugged in.");
} else { // if source is battery
psValue = (CFStringRef)CFDictionaryGetValue(pSource, CFSTR(kIOPSNameKey));
int curCapacity = 0;
int maxCapacity = 0;
int percent;
psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSCurrentCapacityKey));
CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &curCapacity);
psValue = CFDictionaryGetValue(pSource, CFSTR(kIOPSMaxCapacityKey));
CFNumberGetValue((CFNumberRef)psValue, kCFNumberSInt32Type, &maxCapacity);
percent = (int)((double)curCapacity/(double)maxCapacity * 100);
if (!percent) {
NSLog(@"Battery %% is nil");
} else {
NSLog(@"Battery %% is %i", percent);
}
CFRelease(psValue);
}
}
}
CFRelease(sources);
CFRelease(pSource); }