Re: [Swig-user] Syntax Error in input(1) - Newbie Question

[David P. <dpi...@me...>]

I am not aware of any problems with the SWIG parser's support of extern, but I hardly ever use that keyword. Assuming it's valid C code, SWIG should accept it also.

Failure to declare a type (e.g. U16) in SWIG doesn't cause a syntax error; instead there would be problems with the wrapper because SWIG will treat it as an opaque object, not knowing that it is an integer.

To get help on this list you should provide a complete example (but as simple as possible) of a .i file that doesn't work.

> -----Original Message-----
> From: pv...@gm... [mailto:pv...@gm...] On Behalf Of Pradyumna
> Desale
> Sent: Wednesday, March 18, 2009 3:46 PM
> To: David Piepgrass
> Cc: swi...@li...
> Subject: Re: [Swig-user] Syntax Error in input(1) - Newbie Question
> 
> Hi David,
> 
> Thank you for the prompt reply. Earlier one was my first post on the list
> and your forthcoming reply has taken away most of my hesitation about
> asking questions.
> 
> I had guessed that that could be a problem. I have imported the header
> file containing typedefs and was still getting the same error. I also
> tried directly copying the declarations -
> 
> typedef unsigned char       U8;     /// Generic 8 bit unsigned data type
> typedef unsigned short      U16;    /// Generic 16 bit unsigned data type
> 
> inside the .i file. I was still getting the same error.
> 
> I think there is some mistake in the way I have been defining structures.
> Specifically, the problem is coming from extern keyword before a struct
> declaration. If I have declarations like - struct { }; instead of extern
> struct { };, I no longer get the syntax error.
> 
> What are the situations in which 'extern' should be used and  when it
> should not be used? How is it going to affect the way Python functions
> with C?
> 
> Also, now I get a warning message  -  Unable to set variable of type U8 []
> and  Unable to set variable of type U16 []. Is there something obvious I
> am missing/ doing wrong?
> 
> Regards,
> Prady
> 
> 
> 
> 
> On Wed, Mar 18, 2009 at 3:49 PM, David Piepgrass
> <dpi...@me...> wrote:
> 
> 
> 	are U8, and U16 defined?
> 
> 	Also you have a comma at the end of the first line instead of a
> semicolon.
> 
> 
> 	> -----Original Message-----
> 	> From: Pradyumna Desale [mailto:pv...@ps...]
> 	> Sent: Wednesday, March 18, 2009 1:22 PM
> 	> To: swi...@li...
> 	> Subject: [Swig-user] Syntax Error in input(1) - Newbie Question
> 	>
> 	> Hi All,
> 	>
> 	> I am trying to modify a .h file into .i file.
> 	>
> 	> Original .h looks like this -
> 	>
> 	> void (*ep_rx)(U8 *data, U8 len, U16 src_addr, U8 src_ep, U16
> clust_id),
> 	> void (*ep_conf)(U8, U8));
> 	> void af_ep_unreg(U8 ep_num);
> 	> ep_entry_t *af_ep_find(U8 ep_num);
> 	>
> 	> My .i file -
> 	>
> 	> extern void (*ep_rx)(U8 *data, U8 len, U16 src_addr, U8 src_ep,
> U16
> 	> clust_id),
> 	> extern void (*ep_conf)(U8, U8));
> 	> extern void af_ep_unreg(U8 ep_num);
> 	> extern ep_entry_t *af_ep_find(U8 ep_num);
> 	>
> 	> I am getting the syntax error in input(1) message for all the
> above lines.
> 	>
> 	> I am using python 2.5.1, swig 1.3.35, gcc 4.3.2 on Ubuntu 8.04
> 	>
> 	> Can anyone please explain whats the problem with whatever I am
> doing?
> 	>
> 	> All the help is appreciated.
> 	>
> 	> Thanks and Regards,
> 	> Prady
> 	> -- ------
> 	> Graduate Student
> 	> Electrical Engineering
> 
> 
> 
> 
> --------
> Graduate Student
> Electrical Engineering
>