StackOverflow2013

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copied!<p>You should be using <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSNotification_Class/Reference/Reference.html#//apple_ref/occ/clm/NSNotification/notificationWithName:object:userInfo:" rel="nofollow noreferrer">+notificationWithName:object:userInfo:</a> not <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSNotification_Class/Reference/Reference.html#//apple_ref/occ/clm/NSNotification/notificationWithName:object:" rel="nofollow noreferrer">+notificationWithName:object:</a>. </p> <p>The object parameter is the object sending the notification. Normally this would be self for an object posting the notification but since your calling this from a C function it should be nil.</p> <p>The userInfo parameter is an <code>NSDictionary</code> so add the <code>NSValue</code> to a dictionary and send that.</p> <p>Then in your selName: method get the <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSNotification_Class/Reference/Reference.html#//apple_ref/occ/instm/NSNotification/userInfo" rel="nofollow noreferrer">-userInfo</a> dict from the <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSNotification_Class/Reference/Reference.html" rel="nofollow noreferrer">NSNotification</a> and pull your info out from there.</p> <p>Note: You are creating a leak by retaining the <code>NSValue</code> when you shouldn't.</p> <p>Edit:</p> <p>How long does the struct exist? <code>NSValue</code> will not copy the contents of the pointer so maybe it's being deallocated? Try using <code>NSData</code>'s <a href="http://developer.apple.com/documentation/Cocoa/Reference/Foundation/Classes/NSData_Class/Reference/Reference.html#//apple_ref/occ/clm/NSData/dataWithBytes:length:" rel="nofollow noreferrer">dataWithBytes:length:</a> instead.</p> <p>Also make sure to check the console for runtime errors (in Xcode:<code>Run > Console</code>).</p> <p>And you do not need to retain dict. You may want to (re)read the <a href="http://developer.apple.com/documentation/Cocoa/Conceptual/MemoryMgmt/MemoryMgmt.html" rel="nofollow noreferrer">Cocoa memory management</a> docs. </p>

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