Post Notification using Apple NSNotificationCenter with Pure c# and CoreFoundation

AppleMessageSend.cs

using System;
using System.Runtime.InteropServices;


public static class AppleMessagesend {

#if UNITY_IOS || UNITY_EDITOR_OSX || UNITY_STANDALONE_OSX || UNITY_TVOS

    const int kCFStringEncodingUTF8 = 0x08000100;

    [DllImport("__Internal")]
    static extern IntPtr CFStringCreateWithCString(IntPtr alloc, IntPtr cStr, int encoding);

    [DllImport("__Internal")]
    static extern void CFRelease(IntPtr cf);

    [DllImport("__Internal")]
    static extern void CFRetain(IntPtr cf);

    [DllImport("__Internal")]
    static extern IntPtr CFDataCreate(IntPtr allocator, byte[] bytes, long length);

    [DllImport("__Internal")]
    static extern void CFShow(IntPtr cfRef);

    [DllImport("__Internal")]
    static extern IntPtr CFPropertyListCreateWithData(
        IntPtr allocator,
        IntPtr data,
        ulong options,
        IntPtr format, // nullable
        IntPtr* error    // nullable
    );

    [DllImport("__Internal")]
    static extern IntPtr CFNotificationCenterGetLocalCenter();

    [DllImport("__Internal")]
    static extern void CFNotificationCenterPostNotification(IntPtr center, IntPtr name, IntPtr obj, IntPtr userInfo, bool deliverImmediately);

    [DllImport("__Internal")]
    static extern ulong CFDictionaryGetTypeID();

    [DllImport("__Internal")]
    static extern ulong CFGetTypeID(IntPtr cf);

    public static unsafe bool dispatchMessage(string @namespace, string plistString)
    {
        if (string.IsNullOrEmpty(@namespace) || string.IsNullOrEmpty(plistString))
            return false;

        IntPtr cfName = IntPtr.Zero;
        IntPtr cfData = IntPtr.Zero;
        IntPtr plist = IntPtr.Zero;

        try
        {
            {
                byte[] utf8Bytes = System.Text.Encoding.UTF8.GetBytes(@namespace);
                Array.Resize(ref utf8Bytes, utf8Bytes.Length + 1);
                fixed (byte* pUtf8 = utf8Bytes)
                {
                    cfName = CFStringCreateWithCString(IntPtr.Zero, (IntPtr)pUtf8, kCFStringEncodingUTF8);
                    if (cfName == IntPtr.Zero) return false;
                }
            }

            // CFData for plist string
            byte[] bytes = Encoding.UTF8.GetBytes(plistString);
            cfData = CFDataCreate(IntPtr.Zero, bytes, bytes.Length);
            if (cfData == IntPtr.Zero) return false;

            // Parse plist
            IntPtr* errorPtr = stackalloc IntPtr[1];
            errorPtr[0] = IntPtr.Zero;

            plist = CFPropertyListCreateWithData(IntPtr.Zero, cfData, 0, IntPtr.Zero, errorPtr);
            if (plist == IntPtr.Zero)
            {
#if UNITY_EDITOR
                UnityEngine.Debug.LogWarning("[AppleMessagesend] Failed to parse plist.");
#endif
                CFShow(*errorPtr);
                CFRelease(*errorPtr);
                return false;
            } else if (CFGetTypeID(plist) != CFDictionaryGetTypeID())
            {
#if UNITY_EDITOR
                UnityEngine.Debug.LogWarning("[AppleMessagesend] plist is not a dictionary.");
#endif
                CFShow(plist);
                return false;
            }

            // Post
            IntPtr center = CFNotificationCenterGetLocalCenter();
            CFNotificationCenterPostNotification(center, cfName, IntPtr.Zero, plist, true);
            return true;
        }
        finally
        {
            // Cleanup
            if (cfName != IntPtr.Zero) CFRelease(cfName);
            if (cfData != IntPtr.Zero) CFRelease(cfData);
            if (plist != IntPtr.Zero) CFRelease(plist);
            
        }
    }

#else

    public static bool dispatchMessage(string @namespace, string plistString)
    {
        Debug.LogWarning("[AppleMessagesend] dispatchMessage is not supported on this platform.");
        return false;
    }

#endif

}