活动监视器没有响应

Question

当我以 1 秒的时间间隔调用以下函数时，会导致 Activity Monitor 中的 Not Responding，谁能告诉我原因并提出解决方案？

NSWorkspace* workspace = [NSWorkspace sharedWorkspace];

NSDictionary* currentAppInfo      = [workspace activeApplication];

//get the PSN of the current app
UInt32 lowLong                    = [[currentAppInfo objectForKey:@"NSApplicationProcessSerialNumberLow"] longValue];
UInt32 highLong                   = [[currentAppInfo objectForKey:@"NSApplicationProcessSerialNumberHigh"] longValue];
ProcessSerialNumber currentAppPSN = {highLong,lowLong};


//grab window information from the window server
CFArrayRef windowList             = CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
ProcessSerialNumber myPSN         = {kNoProcess, kNoProcess};
//loop through the windows, the window list is ordered from front to back
for (NSMutableDictionary* entry in (NSArray*) windowList)
{
    int pid = [[entry objectForKey:(id)kCGWindowOwnerPID] intValue];
    GetProcessForPID(pid, &myPSN);

    //if the process of the current window in the list matches our process, get the front window number
    if(myPSN.lowLongOfPSN == currentAppPSN.lowLongOfPSN && myPSN.highLongOfPSN == currentAppPSN.highLongOfPSN)
    {
        NSNumber* windowNumber    = [entry objectForKey:(id)kCGWindowNumber];
        NSString* applicationName = [entry objectForKey:(id)kCGWindowOwnerName];
        NSLog(@"The current app is %@ and the window number of its front window is %@.",applicationName,windowNumber);
        //break because we only want the front window
        break;
    }
}
CFRelease(windowList);

Answer 1

使用乐器（采样器乐器）对其进行分析，看看它在哪里花费时间。

编辑：

不完全确定是什么原因造成的，但作为一种解决方法，您可以比较 PID 而不是序列号。使用[[NSProcessInfo processInfo] processIdentifier]获得自己的 PID 很容易