On 15 Feb, 2012, at 1:18 , cocoa-dev-requ...@lists.apple.com wrote:

> The NSEvent locationInWindow docs say: "For non-mouse events the return value 
> of this method is undefined."
> 
> I've just been bitten by this.  Seems it would be easy to detect at runtime 
> and assert, is there any magic environment variable or defaults value that 
> can help me catch such incorrect usage?  I've searched but not found...

Are you calling -type on the events you are receiving? Checking that value 
should make it clear whether the event you have received is a mouse event or 
not.  If not, and you need the mouse location, you can get if from NSEvent's 
+mouseLocation or a relevant window instance's 
-mouseLocationOutsideOfEventStream.

Jim
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