我有以下代码:(很长）
{"where": {"archived_at":{ "neq": null }}}
随机（=不是每次），当控制达到这种情况时，将发生错误（EXC_BAD_ACCESS或EXC_I386_GPFLT），它将分别由//declarations (in the header) :
NSDictionary* batteryRawDict;
@property (strong, atomic, readonly) NSDictionary* batteryReport; //this dictionary is, obviously, @synthesize'd
case PFSKGroupBattery: { //to get more informations or to subscribe for events about power sources, use the IOPowerSources API
if (!firstRunDoneForBattery) {
batEntry = IOServiceGetMatchingService(masterPort, IOServiceMatching("IOPMPowerSource"));
if (batEntry == 0) {
_error = PFSKReturnComponentUnavailable;
return false;
}
}
CFMutableDictionaryRef batProps = NULL;
result = IORegistryEntryCreateCFProperties(batEntry, &batProps, NULL, 0);
if (result!=kIOReturnSuccess) {
_error = PFSKReturnIOKitCFFailure;
_extError = result;
return false;
} else {
batteryRawDict = (__bridge NSDictionary*)batProps;
CFRelease(batProps);
NSMutableDictionary* temp = [NSMutableDictionary.alloc init];
if (!firstRunDoneForBattery) { //static keys
//[temp setObject:[batteryRawDict objectForKey:@"DesignCapacity"] forKey:@"DesignedCapacity"];
[temp setObject:[batteryRawDict objectForKey:@"DesignCycleCount9C"] forKey:@"DesignedCycleCount"];
[temp setObject:[batteryRawDict objectForKey:@"BatterySerialNumber"] forKey:@"Serial"];
[temp setObject:[batteryRawDict objectForKey:@"DeviceName"] forKey:@"Model"];
[temp setObject:[batteryRawDict objectForKey:@"Manufacturer"] forKey:@"Manufacturer"];
unsigned int manufactureDateAsInt = [[batteryRawDict objectForKey:@"ManufactureDate"] intValue];
NSDateComponents* manufactureDateComponents = [[NSDateComponents alloc]init];
manufactureDateComponents.year = (manufactureDateAsInt >> 9) + 1980;
manufactureDateComponents.month = (manufactureDateAsInt >> 5) & 0xF;
manufactureDateComponents.day = manufactureDateAsInt & 0x1F;
[temp setObject:[[NSCalendar currentCalendar] dateFromComponents:manufactureDateComponents] forKey:@"ManufactureDate"];
firstRunDoneForBattery = 1;
}
[temp setObject:[batteryRawDict objectForKey:@"BatteryInstalled"] forKey:@"isPresent"];
[temp setObject:[batteryRawDict objectForKey:@"FullyCharged"] forKey:@"isFull"];
[temp setObject:[batteryRawDict objectForKey:@"IsCharging"] forKey:@"isCharging"];
[temp setObject:[batteryRawDict objectForKey:@"ExternalConnected"] forKey:@"isACConnected"];
[temp setObject:[batteryRawDict objectForKey:@"Amperage"] forKey:@"Amperage"];
[temp setObject:[batteryRawDict objectForKey:@"CurrentCapacity"] forKey:@"CurrentCapacity"];
[temp setObject:[batteryRawDict objectForKey:@"MaxCapacity"] forKey:@"MaxCapacity"];
[temp setObject:[batteryRawDict objectForKey:@"Voltage"] forKey:@"Voltage"];
[temp setObject:[batteryRawDict objectForKey:@"CycleCount"] forKey:@"CycleCount"];
[temp setObject:@(([[batteryRawDict objectForKey:@"MaxCapacity"] intValue] / [[batteryRawDict objectForKey:@"DesignCapacity"] intValue])*100) forKey:@"Health"]; //percentage
[temp setObject:@([[batteryRawDict objectForKey:@"Temperature"] doubleValue] / 100) forKey:@"Temperature"];
/*to be checked*/[temp setObject:@([[batteryRawDict objectForKey:@"Amperage"] doubleValue] / 1000 * [[batteryRawDict objectForKey:@"Voltage"] doubleValue] / 1000) forKey:@"Power"];
NSDateComponents* differenceDate = [[NSCalendar currentCalendar] components:NSCalendarUnitDay
fromDate:[temp objectForKey:@"ManufactureDate"]
toDate:[NSDate date]
options:0];
[temp setObject:@([differenceDate day]) forKey:@"Age"];
batteryReport = [temp copy];
NSLog(@"-----------------------awesome debugging code-----------");
}
CFRelease(batProps);
break;
}
上的xCode或@implementation行定位。
有关为何发生这种情况的任何想法？ 谢谢！
答案 0 :(得分：2)
看起来糟糕的内存管理。
在将指针桥接到CFRelease之后，您在batProps上致电NSDictionary。这使batteryRawDict指向垃圾。
我建议你改变这两行：
batteryRawDict = (__bridge NSDictionary*)batProps;
CFRelease(batProps);
为：
batteryRawDict = (__bridge_transfer NSDictionary *)batProps;
如果您使用ARC，那么您就完成了。如果您使用的是MRC，请在适当的位置添加对[batteryRawDict release];的呼叫。
您还会在CGRelease(batProps);声明的末尾再次致电case。这也是一个问题。不要过度发布指针。
也在代码上运行Analyzer。这应该指出这些问题。