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Re: How to pass callback from mach-o to CFM

On Thu, 28 Aug 2003, Kiyoto Takeuchi wrote:

> Dear Mr. Poirier
>
> Thank you for your reply.
>
> > // create a CFM function pointer to a Mach-O function
> > translatedFunctionPtr = NewCFMFromMachO((void*)YourOriginalMachoCallback);
> Upper code locate at Mach-O SHLB
>
> > // when you and the CFM app are all done with it
> > DisposeCFMFromMachO(translatedFunctionPtr);
> My call and upper code locate at CFM App,
> Work fine.
> Thanks a lot!
>
> Also I could not understand acttually your code below.
> > void * NewCFMFromMachO(void * inMachoFunctionPtr)
> > {
> > void * result = NewPtr(8);
> > ((void**)result)[0] = inMachoFunctionPtr;
> > ((void**)result)[1] = result;
> > return result;
> > }
> I guess your code simply slide [1] (second member of array) of marh-o
> pointer.
>
> Would you lindly explain outline of this method?
> Do it require the understanding MACH-O Runtime architecture?
> (I would like to know why the code work fine.)


I think you do. And I don't have that level of understanding, so I can't
give you an explanation. I just found the code somewhere (I'm pretty sure
in some other Apple sample code) and it works, so I'm happy enough to just
leave the methodology as a mystery...

Marc
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References: 
 >Re: How to pass callback from mach-o to CFM (From: Kiyoto Takeuchi <email@hidden>)



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