Re: [Pyobjc-dev] Variable-length array argument

[Ronald O. <ron...@ma...>]

In theorie an array.array of kind 'I' should work, although I haven't  
checked if the metadata is entirely correct for this method. You'll  
have the largest chance for success with a recent checkout of pyobjc- 
core and pyobjc-framework-Cocoa.

Time to write a unittest for this specific case...

Ronald

On 24 Mar, 2009, at 15:13, Orestis Markou wrote:

> Hello,
>
> I'm trying to call NSBitmapImageRep getPixel:atX:y:. The issue is that
> the signature is like this:
> - (void)getPixel:(NSUInteger[])pixelData atX:(NSInteger)x y: 
> (NSInteger)y
>
> And expects a pointer to an array, which is variable in length as it
> depends on the type of the bitmap representation. Here's the things
> I've tried:
>
>  * Passing None: exceptions.TypeError: Need explict buffer for
> variable-length array argument
>  * Passing objc.NULL: works but doesn't return anything :/
>  * Passing lists/strings: exceptions.ValueError: argument 0 must be
> None or objc.NULL
>  * Passing an array.array('i'): exceptions.ValueError: type mismatch
> between array.array of i and and C array of I8i12i16
>  * Passing an array.array('I'): bus error
>  * Passing an array.array('I'), but initialised to size 100 with
> zeroes: exceptions.SystemError: NULL result without error in
> PyObject_Call
>
> I've run out of things to try. So far as I can trace the code, I need
> to pass something that is accepted by PyObject_AsWriteBuffer, and can
> also be converted to this complex c array by PyObjC_PythonToCArray.
> Any pointers on how I can do that?
>
> Thanks,
> Orestis
> --
> or...@or...
> http://orestis.gr/
>
>
>
>
>
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