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从未调用NSWorkspaceWillPowerOffNotification

nsworkspace nsnotifications macos-sierra macos

YanivH · 技术社区 · 7 年前

我试图在后台进程中运行一个程序,该程序将注册系统中的每个关闭事件。

通过注册到NSWorkspaceWillPowerOffNotification来完成此操作,如下所示:

#import <AppKit/AppKit.h>

@interface ShutDownHandler : NSObject <NSApplicationDelegate>

- (void)computerWillShutDownNotification:(NSNotification *)notification;

@end


int main(int argc, char* argv[]) {
    NSNotificationCenter *notCenter;

    notCenter = [[NSWorkspace sharedWorkspace] notificationCenter];

    ShutDownHandler* sdh = [ShutDownHandler new];

    [NSApplication sharedApplication].delegate = sdh;

    [notCenter addObserver:sdh
                  selector:@selector(computerWillShutDownNotification:)
                      name:NSWorkspaceWillPowerOffNotification
                    object:nil];

    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        [[NSFileManager defaultManager] createFileAtPath:@"./output.txt" contents:nil attributes:nil];
    });

    [[NSRunLoop currentRunLoop] run];

    return 0;
}


@implementation ShutDownHandler

- (void)computerWillShutDownNotification:(NSNotification *)notification {
    NSFileHandle* file = [NSFileHandle fileHandleForUpdatingAtPath: @"./output.txt"];
    [file seekToEndOfFile];

    NSDateFormatter* fmt = [NSDateFormatter new];
    [fmt setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    NSDate* current = [NSDate date];

    NSString* dateStr = [fmt stringFromDate:current];
    [dateStr writeToFile:@"./output.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];
}

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
    return NSTerminateCancel;
}

@end

由于某些我无法理解的原因,从未调用过NSWorkspaceWillPowerOffNotification处理程序!

还将以下内容添加到我的。plist:

<key>NSSupportsSuddenTermination</key>
<false/>

但在关闭我的系统时,仍然没有注册通知。

知道为什么吗??

3 回复 | 直到 7 年前

YanivH 7 年前

供将来参考:

我无法注册上述活动,并看到它火灾。

apple open-source power management

在这里,您可以看到我们有通知名称,例如: “com.apple.system.loginWindows.logoutNoReturn”

你可以注册到这些网站,这样就可以了。

希望有一天这能帮助别人:)

Irad K 7 年前

当你说你已经将代码作为后台进程运行时,你的意思是它基于根据中的plist文件处理的启动守护进程吗 /Library/LaunchDeamon ? 在这种情况下,不会发送通知。试着在下面运行 Cocoa application

我仍在寻找一种方法,在后台deamon过程中获取这些通知。

H. Katsura 3 年前

我能做到 NSWorkspaceWillPowerOffNotification 和 applicationShouldTerminate: NSApplicationActivationPolicyAccessory 并将运行循环替换为 [NSApp run] . 如果您想继续监视所有注销(和/或关机尝试),它仍然不会很有用,因为它仅在用户已登录时启动进程时起作用,并且它只能检测当前UI登录会话的关机/注销通知和“应用程序应终止”委托。

[NSApp运行]

因此,如果你想继续监视用户的注销(或关机尝试),你需要一个非应用程序(没有 [NSApp运行] )过程。

NSWorkspaceSessionDidBecomeActiveNotification 和 NSWorkspaceSessionDidResignActiveNotification 工作无需如果您想监视用户是关闭还是重新打开。

或者,如果系统配置API适用于您的用例,您也可以尝试它。

“技术问答QA1133:确定控制台用户登录状态” https://developer.apple.com/library/archive/qa/qa1133/_index.html

听起来像 com.apple.system.loginwindow.logoutNoReturn 无论你想做什么,这都是最好的选择。很高兴知道!

// cc powreoff-notification.m -o poweroff-notification -framework AppKit
#import <AppKit/AppKit.h>

@interface ShutDownHandler : NSObject <NSApplicationDelegate>

- (void)computerWillShutDownNotification:(NSNotification *)notification;

@end

int main(int argc, char* argv[]) {
    @autoreleasepool {
        NSLog(@"%s", __func__);
        NSNotificationCenter* notCenter = [[NSWorkspace sharedWorkspace] notificationCenter];

        ShutDownHandler* sdh = [ShutDownHandler new];

        [NSApplication sharedApplication].delegate = sdh;

        [notCenter addObserver:sdh
                      selector:@selector(computerWillShutDownNotification:)
                          name:NSWorkspaceWillPowerOffNotification
                        object:nil];

        static dispatch_once_t onceToken;
        dispatch_once(&onceToken, ^{
            [[NSFileManager defaultManager] createFileAtPath:@"./output.txt" contents:nil attributes:nil];
        });

        // without NSApplicationActivationPolicyAccessory, the [NSApp run] process gets killed on
        // poweroff/logout instead of getting the power off notification or applicationShouldTerminate:.
        [NSApp setActivationPolicy:NSApplicationActivationPolicyAccessory];

        // without [NSApp run], you won't get the power off notification or applicationShouldTerminate:.
        //[[NSRunLoop currentRunLoop] run];
        [NSApp run];

        // this process needs to be launched while the user has already logged in. otherwise,
        // you won't get the power off notification or applicationShouldTerminate:.
    }

    return 0;
}

@implementation ShutDownHandler

- (void)computerWillShutDownNotification:(NSNotification *)notification {
    NSLog(@"%s", __func__);
    NSFileHandle* file = [NSFileHandle fileHandleForUpdatingAtPath: @"./output.txt"];
    [file seekToEndOfFile];

    NSDateFormatter* fmt = [NSDateFormatter new];
    [fmt setDateFormat:@"yyyy-MM-dd HH:mm:ss\n"];
    NSDate* current = [NSDate date];

    NSString* dateStr = [fmt stringFromDate:current];
    [dateStr writeToFile:@"./output.txt" atomically:YES encoding:NSUTF8StringEncoding error:nil];
}

- (NSApplicationTerminateReply)applicationShouldTerminate:(NSApplication *)sender
{
    NSLog(@"%s", __func__);
    return NSTerminateCancel;
}

@end