How to P/Invoke os_log?

How to P/Invoke os_log?

By : user2173366
Date : October 21 2020, 08:10 AM
To fix this issue Macro os_log
In contrast to the os_log_create function, os_log is a macro, as already mentioned in the comments.
code :
os_log(log, "%{public}s", "Test!");
 #include <os/log.h>

 extern void Log(os_log_t log, char *message) {
     os_log(log, "%{public}s", message);
using System;
using System.Runtime.InteropServices;

namespace Foo 
    class Program
        [DllImport("System", EntryPoint = "os_log_create")]
        private static extern IntPtr os_log_create(string subsystem, string category);

        [DllImport("Logging", EntryPoint = "Log")]
        private static extern void Log(IntPtr log, string msg);

        static void Main(string[] args)
            IntPtr log = os_log_create("some.bundle.id", "SomeCategory");
            Log(log, "Test!");

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Read logs using the new swift os_log api

Read logs using the new swift os_log api

By : Nz Cage
Date : March 29 2020, 07:55 AM
Hope this helps Looks like you need to use the enhanced Console instead of your own log viewer. The logs are compressed and not expanded until viewed - this makes logging much less intrusive at debug levels. There is no text form of the logs however.
See the 2016 WWDC video session 721 "Unified Logging and Activity Tracing" https://developer.apple.com/videos/play/wwdc2016/721/
swift logging for iOS >= 8 with os_log and NSLog

swift logging for iOS >= 8 with os_log and NSLog

By : eragon
Date : March 29 2020, 07:55 AM
To fix the issue you can do The first argument of both os_log() and NSLog() is a format string, and contains format specifiers (starting with %) which are expanded by the following variable argument list.
To log an arbitrary string, use the %@ format, followed by the string. Otherwise it can crash or produce wrong output if the string contains % characters:
code :
func LogDebug(log: String) {
    if #available(iOS 10.0, macOS 10.12, *) {
        os_log("%@", type: .debug, log)
    } else {
        NSLog("%@", log)
how to see iOS device logs in Console app using os_log

how to see iOS device logs in Console app using os_log

By : Hongruo Ye
Date : March 29 2020, 07:55 AM
help you fix your problem This is not a complete answer, but a large part of the trick seems to be this:
In Xcode's Devices and Simulators window, locate the device and show the console display by tapping the tiny button at the lower left.
Does XCGLogger use os_log for fast logging?

Does XCGLogger use os_log for fast logging?

By : ValerieRRowe
Date : March 29 2020, 07:55 AM
should help you out Currently XCGLogger does not use os_log. I (the developer of XCGLogger) haven't added support for it yet. However, since XCGLogger is modular, you could create a new log destination that uses os_log if you need it. I'd appreciate a pull request if you do so that I can add it to the project for others.
Apple's docs for os_log are here: https://developer.apple.com/documentation/os/logging
os_log - use of unresolved identifier error

os_log - use of unresolved identifier error

By : Čipka Šipka
Date : March 29 2020, 07:55 AM
I hope this helps . I'm trying to use the new os_log API, by logging a simple statement: os_log("Hello") , Because you forgot to
code :
import os 
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