[Swig-user] RE: Error codes to exceptions

[Sohail S. <s.s...@fi...>]

> -----Original Message-----
> From: Sohail Somani=20
> Sent: Sunday, May 28, 2006 11:15 AM
> To: swi...@li...
> Subject: Error codes to exceptions
>=20
> Hi,
>=20
> I'm dealing with a C-API that has the following:
>=20
> long MakeHandle(HANDLE * out_handle);
> long GetSomeString(HANDLE in_handle,char * out_string,int <---- char *
out, not char ** out :)
> max_length);
>=20
> How can I define an interface file that will let me access=20
> this from python? I've tried doing a straight wrap and what=20
> happens is that python tells me that the call to MakeHandle=20
> requires a pointer...

Ok, I figured out the part about the pointers. For now im using the
cpointers typemap library.

However, I still want to be able to do something like this:

try:
	handle=3DMakeHandle();
	my_shiny_string=3DGetSomeString(handle); # default the buffer size
to 4096 or something.
except ...:
	print "A function returned a non-zero error code";

Right now, I'm at:

try:
	handle=3Dnew_HANDLE(); # using cpointers
	if(MakeHandle(handle)): raise...;
	# don't know how to do this part yet ...
my_shiny_string=3DGetSomeString(handle);=20
except ...:=20
	...

I know its gotta do with typemaps... And I'm sure there is a way...
Total noob to writing my own swig though.

TIA,

Sohail