Re: [Swig-user] Q: returning values in function parameters

[Thom D. <t.r...@la...>]

> -----Original Message-----
> From: swi...@li... [mailto:swig-user-
> bo...@li...] On Behalf Of Thom DeCarlo
> Sent: Wednesday, February 07, 2007 4:16 PM
> To: 'Swig-user email list'
> Subject: [Swig-user] Q: returning values in function parameters
> 
> Ok, for my next stupid noobie question...
> 
> I am wrapping a function whose return value indicates success or failure
> of
> an operation and places the result of the operation in one of the function
> arguments. The Python book I'm using (Beginning Python: From Novice to
> Professional by Magnus Lie Hetland) seems to ignore this standard C
> feature.
> 
> 
> Can someone tell me how do I wrap the function and then how do I call the
> function in python?
> 
> The C++ function looks like this:
> 
> 	BOOL GetHashIndex(std::string, unsigned long* index);
> 
> SWIG doesn't seem to mind that definition. But when I try to call the
> function in Python I get:
> 
> >>> nsm.GetHashIndex("latdeg", hashindex)
> Traceback (most recent call last):
>   File "<stdin>", line 1, in ?
>   File "pyNamedSharedMemory.py", line 113, in GetHashIndex
>     def GetHashIndex(*args): return
> _pyNamedSharedMemory.utNamedSharedMemory_GetHashIndex(*args)
> TypeError: in method 'utNamedSharedMemory_GetHashIndex', argument 3 of
> type
> 'unsigned long *'
> >>>
> 
> I can't find any guidance on how to pass the address of a variable to be
> set
> within the called function. Can anyone please hit me with a clue-stick?
> 
> Thanks,
> Thom
> --
> 

Nevermind. Shortly after sending this note I found section 29.7.1 in the
SWIGDocumentation.pdf file. That gave a pretty through answer to my
question.

Sorry for using up the bandwidth.

Thom