在Mac OSX上的接收功率的通知（尤其是关机） [英] Receiving power notifications (especially shutdown) on Mac OSX

问题描述

我在C语言编写面向Mac（豹）的应用程序睡眠，唤醒，关机，重启。它通过运行的launchd 作为登录一个launchagent然后开始监测的通知。在code我使用要做到这一点如下：

I'm writing an application in C for the Mac (Leopard) that needs to do some work on receipt of power notifications, e.g. sleep, wake-up, shutdown, restart. It runs via launchd as a launchagent on login then begins monitoring for notifications. The code I'm using to do this is as follows:

/* ask for power notifications */
static void StartPowerNotification(void)
{
    static io_connect_t rootPort;   
    IONotificationPortRef notificationPort;
    io_object_t notifier;

    rootPort = IORegisterForSystemPower(&rootPort, &notificationPort, 
                                        PowerCallback, &notifier);
    if (!rootPort) 
        exit (1);

    CFRunLoopAddSource (CFRunLoopGetCurrent(),  
                        IONotificationPortGetRunLoopSource(notificationPort), 
                        kCFRunLoopDefaultMode);
}

/* perform actions on receipt of power notifications */
void PowerCallback (void *rootPort, io_service_t y, 
                    natural_t msgType, void *msgArgument)
{
    switch (msgType) 
    {
        case kIOMessageSystemWillSleep:
            /* perform sleep actions */
            break;

        case kIOMessageSystemHasPoweredOn:
            /* perform wakeup actions */
            break;

        case kIOMessageSystemWillRestart:
            /* perform restart actions */
            break;

        case kIOMessageSystemWillPowerOff:
            /* perform shutdown actions */
            break;
    }
}

然而，只有前两名的睡眠和唤醒（ kIOMessageSystemWillSleep 和 kIOMessageSystemHasPoweredOn ）永远被调用。我从来没有得到重新启动或关机（ kIOMessageSystemWillRestart 和 kIOMessageSystemWillPowerOff ）。

However, only the top two for sleep and wake (kIOMessageSystemWillSleep and kIOMessageSystemHasPoweredOn) ever get called. I never get any notifcations for restart or shutdown (kIOMessageSystemWillRestart and kIOMessageSystemWillPowerOff).

我是不是做错了什么？或者是有这会给我的重启和关机通知另一个API？我想preFER保持它作为一个C程序（如多数民众赞成我熟悉的），但我开到（我看了一下登录/注销挂钩，但这些似乎是替代品的任何明智的建议德$ p $赞成的launchd的pcated）。

Am I doing something wrong? Or is there another API that would give me the restart and shutdown notifications? I'd prefer to keep it as a C program (as thats what I'm familiar with) but am open to any sensible suggestions of alternatives (I've had a look at login/logout hooks but these seem to be deprecated in favour of launchd).

在此先感谢您的帮助/提示！

Thanks in advance for any help/tips!

推荐答案

我知道你可以从NSWorkspace的NSWorkspaceWillPowerOffNotification通知，这是不是一个C函数，但没有工作。

I know you can register for the NSWorkspaceWillPowerOffNotification notification from NSWorkspace, which is not a C function but does work.

#import <AppKit/AppKit.h>
#import "WorkspaceResponder.h"

int main (int argc, const char * argv[]) {
    NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
    NSNotificationCenter *nc = [[NSWorkspace sharedWorkspace] notificationCenter];
    WorkspaceResponder *mainController = [[WorkspaceResponder alloc] init];

    //register for shutdown notications
    [nc addObserver:mainController
selector:@selector(computerWillShutDownNotification:)
          name:NSWorkspaceWillPowerOffNotification object:nil];
    [[NSRunLoop currentRunLoop] run];
    [pool release];
    return 0;
}

然后在WorkspaceResponder.m：

Then in WorkspaceResponder.m:

- (void) computerWillShutDownNotification:(NSNotification *)notification {
    NSLog(@"Received Shutdown Notification");
}

这篇关于在Mac OSX上的接收功率的通知（尤其是关机）的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！