[Openmcl-devel] Errors Creating NSTimer

Brent Fulgham bfulg at pacbell.net
Wed Oct 24 05:34:36 UTC 2007


Doh!  Of course...

I guess I'm still reeling from the recent Clozure Common Lisp  
announcement!  Why wasn't that shown on this list (did I miss it?)

-Brent

On Oct 23, 2007, at 10:20 PM, Gary Byers wrote:

> The first argument to any ObjC method should be the "receiver" (the
> object - instance (usually) or class (sometimes) - that might  
> implement
> a method on the message.  If this were CLOS, we might call the  
> receiver
> the first and only specialized parameter.)
>
> In the case of
> #/scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:,
> the receiver is the class "NSTimer" (which happens to be the value
> of the variable NS:NS-TIMER.)  The bridge is complaining because
> the first argument in your calls below either isn't a pointer at
> all or isn't a pointer to an ObjC class or instance; getting a lisp- 
> level
> error like that is probably better than trying to send a message to
> 0.01d0 ...
>
>
> On Tue, 23 Oct 2007, Brent Fulgham wrote:
>
>> I'm trying to get the right Cocoa bridge syntax for calling:
>>
>> scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:
>> Returns a new NSTimer object and adds it to the current NSRunLoop  
>> object in the default mode.
>>
>> + (NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)seconds  
>> target:(id)target selector:(SEL)aSelectoruserInfo:(id)userInfo  
>> repeats:(BOOL)repeats
>>
>> NSTimeInterval is just a typedef to double, so I thought that I  
>> could just pass the double value to the function, since this is how  
>> many of the example Objective C programs are written, but this does  
>> not work for a variety of reasons:
>>
>> 1.  If I attempt to simply use a bare double, it's not happy:
>>
>> (let* ((TimerInterval (ccl::%double-float 0.01)))
>>           (Timer (#/ 
>> scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:  
>> TimeInterval (cocoa-view self) (objc:@selector #/animate) (ccl:: 
>> %null-ptr) #$YES)))
>>
>>> Error: value 0.009999999776482582D0 is not of the expected type  
>>> MACPTR.
>>> While executing: CCL::SEND-UNAMBIGUOUS-MESSAGE, in process  
>>> listener(1).
>>
>> 2.  If I attempt to use an RLET to allocate the C Type, it's still  
>> not happy:
>>
>> (rlet ((TimeInterval :<NST>ime<I>nterval (ccl::%double-float 0.01)))
>>  (let* (
>>         (Timer (#/ 
>> scheduledTimerWithTimeInterval:target:selector:userInfo:repeats:  
>> TimeInterval (cocoa-view self) (objc:@selector #/animate) (ccl:: 
>> %null-ptr) #$YES))))
>>    ;; add myself to list
>>    (pushnew Self (animated-views Self))))
>>
>>> Error: value #<A Foreign Pointer [stack-allocated] (:* DOUBLE- 
>>> FLOAT) #xB029BE70> is not of the expected type OBJC:OBJC-OBJECT.
>>> While executing: CCL::SEND-UNAMBIGUOUS-MESSAGE, in process  
>>> listener(1).
>>
>> I vaguely remember a mechanism to convert native C types to Cocoa  
>> analogs, but I cannot find documentation of this, and may be mixing  
>> Objective C up with something up.
>>
>> What's the correct way to deal with this particular API call?
>>
>> Thanks,
>>
>> -Brent




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