Getting notification list from OS X Notification C

问题:

It's possible to send notifications to the Notification Center on Mac using NSUserNotification and NSUserNotificationCenter API classes.

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But is there any way of reading the notifications from the Notification Center?

回答1:

There is no public API for that. So nothing App Store conform.

BUT

As part of my little tech-demo-app DiscoNotifier (where I flash the keyboard LEDs in response to a notification) I wrote a DDUserNotificationCenterMonitor class

see: https://github.com/Daij-Djan/DiscoNotifier/tree/master/DiscoNotifier

it works using FileSystemEvents and SQLite and checks the notification center's database

It works and the database has all info (table: presented_notifications) but.. this is fragile AND private

回答2:

Thanks to Daij-Djan's answer, I could figure out that the preferences for the notification center are located in a SQLite database in ~/Library/Application Support/NotificationCenter/.

To read this database, we can use FMDB which you will find as a pod.

#import "FMDatabase.h"
#import "FMDatabaseAdditions.h"

Get the DB file and open it.

NSString *pathToNCSupport = [@"~/Library/Application Support/NotificationCenter/" stringByExpandingTildeInPath];
NSError *error = nil;
NSArray *contents = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:pathToNCSupport error:&error];    //find the db

FMDatabase *database = nil;
for (NSString *child in contents) {
    if([child.pathExtension isEqualToString:@"db"]) {
        database = [FMDatabase databaseWithPath:[pathToNCSupport stringByAppendingPathComponent:child]];
        if([database open]) {
            printf("Opening Notification Center");
            [database close];
            break;
        }
    }
}

Launch any SQL query:

if([database open]) {
    FMResultSet *rs = [database executeQuery:@"select count(*) as cnt from presented_notifications"];
    while ([rs next]) {
        int cnt = [rs intForColumn:@"cnt"];
        NSLog(@"Total Records :%d", cnt);
    }

    [database close];
}

Complete project on Github.