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    <p>Alright, I wrote up a little example of CFNotificationCenter. Generally, nobody uses CoreFoundation for large projects, and instead use Foundation. If you are really writing this project in Objective-C (as I assume from your tags), I would suggest using <a href="http://developer.apple.com/library/mac/#documentation/Cocoa/Reference/Foundation/Classes/NSNotificationCenter_Class/Reference/Reference.html" rel="noreferrer">NSNotificationCenter</a>. Without further adue, here is the example:</p> <pre><code>#include &lt;CoreFoundation/CoreFoundation.h&gt; void notificationCallback (CFNotificationCenterRef center, void * observer, CFStringRef name, const void * object, CFDictionaryRef userInfo) { CFShow(CFSTR("Received notification (dictionary):")); // print out user info const void * keys; const void * values; CFDictionaryGetKeysAndValues(userInfo, &amp;keys, &amp;values); for (int i = 0; i &lt; CFDictionaryGetCount(userInfo); i++) { const char * keyStr = CFStringGetCStringPtr((CFStringRef)&amp;keys[i], CFStringGetSystemEncoding()); const char * valStr = CFStringGetCStringPtr((CFStringRef)&amp;values[i], CFStringGetSystemEncoding()); printf("\t\t \"%s\" = \"%s\"\n", keyStr, valStr); } } int main (int argc, const char * argv[]) { CFNotificationCenterRef center = CFNotificationCenterGetLocalCenter(); // add an observer CFNotificationCenterAddObserver(center, NULL, notificationCallback, CFSTR("MyNotification"), NULL, CFNotificationSuspensionBehaviorDeliverImmediately); // post a notification CFDictionaryKeyCallBacks keyCallbacks = {0, NULL, NULL, CFCopyDescription, CFEqual, NULL}; CFDictionaryValueCallBacks valueCallbacks = {0, NULL, NULL, CFCopyDescription, CFEqual}; CFMutableDictionaryRef dictionary = CFDictionaryCreateMutable(kCFAllocatorDefault, 1, &amp;keyCallbacks, &amp;valueCallbacks); CFDictionaryAddValue(dictionary, CFSTR("TestKey"), CFSTR("TestValue")); CFNotificationCenterPostNotification(center, CFSTR("MyNotification"), NULL, dictionary, TRUE); CFRelease(dictionary); // remove oberver CFNotificationCenterRemoveObserver(center, NULL, CFSTR("TestValue"), NULL); return 0; } </code></pre> <p>This example creates an observer, posts a simple dictionary to it, and removes the observer. More information on CFNotificationCenter can be found on <a href="http://developer.apple.com/library/mac/#documentation/CoreFoundation/Reference/CFNotificationCenterRef/Reference/reference.html" rel="noreferrer">Apple's CFNotificationCenter Reference</a>.</p>
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    1. COThank you, these bits and pieces are exactly what I was looking for and now I understand how it works. I'm doing this between two apps so I've used CFNotificationCenterGetDistributedCenter instead of the local one. But otherwise, thanks!
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