I'm not able to build IP2Location's Python interface so I'm
trying to use ctypes to call its C interface. The functions
return a pointer to the struct below. I haven't been able to
figure out how I should declare the return type of the functions
and read the fields. Any hint is appreciated.
typedef struct
{
char *country_short;
char *country_long;
char *region;
char *city;
char *isp;
float latitude;
float longitude;
char *domain;
char *zipcode;
char *timezone;
char *netspeed;
} IP2LocationReco rd;
6  12923 
On Apr 25, 5:09 am, "Jack" <nos...@invalid .comwrote:
typedef struct
{
char *country_short;
char *country_long;
char *region;
char *city;
char *isp;
float latitude;
float longitude;
char *domain;
char *zipcode;
char *timezone;
char *netspeed;
} IP2LocationReco rd;
First define a struct type IP2LocationReco rd by subclassing from
ctypes.Structur e. Then define a pointer type as
ctypes.POINTER( IP2LocationReco rd) and set that as the function's
restype attribute. See the ctypes tutorial or reference for details.
On Apr 25, 5:15 am, sturlamolden <sturlamol...@y ahoo.nowrote:
First define a struct type IP2LocationReco rd by subclassing from
ctypes.Structur e. Then define a pointer type as
ctypes.POINTER( IP2LocationReco rd) and set that as the function's
restype attribute. See the ctypes tutorial or reference for details.
Which is to say:
import ctypes
class IP2LocationReco rd(ctypes.Struc ture):
_fields_ = [
('country_short ', ctypes.c_char_p ),
('country_long' , ctypes.c_char_p ),
('region', ctypes.c_char_p ),
('city', ctypes.c_char_p ),
('isp', ctypes.c_char_p ),
('latitude', ctypes.c_float) ,
('longitude', ctypes.c_float) ,
('domain', ctypes.c_char_p ),
('zipcode', ctypes.c_char_p ),
('timezone', ctypes.c_char_p ),
('netspeed', ctypes.c_char_p ),
]
IP2LocationReco rd_Ptr_t = ctypes.POINTER( IP2LocationReco rd)
function.restyp e = IP2LocationReco rd_Ptr_t
Thanks for the prompt and detailed reply. I tried that but was getting this
error:
AttributeError: 'LP_IP2Location Record' object has no attribute
'country_short'
Here's my version, which I think is equivalent to yours:
(as a matter of fact, I also tried yours and got the same error.)
class IP2LocationReco rd(Structure):
_fields_ = [("country_short ", c_char_p),
("country_long" , c_char_p),
("region", c_char_p),
("city", c_char_p),
("isp", c_char_p),
("latitude", c_float),
("longitude" , c_float),
("domain", c_char_p),
("zipcode", c_char_p),
("timezone", c_char_p),
("netspeed", c_char_p)]
IP2Location_get _all.restype = POINTER(IP2Loca tionRecord)
IP2LocationObj = IP2Location_ope n(thisdir + '/IP-COUNTRY-SAMPLE.BIN')
rec = IP2Location_get _all(IP2Locatio nObj, '64.233.167.99' )
print rec.country_sho rt
IP2Location_clo se(IP2LocationO bj)
"sturlamold en" <st**********@y ahoo.nowrote in message
news:4d******** *************** ***********@x35 g2000hsb.google groups.com...
On Apr 25, 5:15 am, sturlamolden <sturlamol...@y ahoo.nowrote:
>First define a struct type IP2LocationReco rd by subclassing from
ctypes.Structu re. Then define a pointer type as
ctypes.POINTER (IP2LocationRec ord) and set that as the function's
restype attribute. See the ctypes tutorial or reference for details.
Which is to say:
import ctypes
class IP2LocationReco rd(ctypes.Struc ture):
_fields_ = [
('country_short ', ctypes.c_char_p ),
('country_long' , ctypes.c_char_p ),
('region', ctypes.c_char_p ),
('city', ctypes.c_char_p ),
('isp', ctypes.c_char_p ),
('latitude', ctypes.c_float) ,
('longitude', ctypes.c_float) ,
('domain', ctypes.c_char_p ),
('zipcode', ctypes.c_char_p ),
('timezone', ctypes.c_char_p ),
('netspeed', ctypes.c_char_p ),
]
IP2LocationReco rd_Ptr_t = ctypes.POINTER( IP2LocationReco rd)
function.restyp e = IP2LocationReco rd_Ptr_t
On Apr 25, 5:39 am, "Jack" <nos...@invalid .comwrote:
AttributeError: 'LP_IP2Location Record' object has no attribute
'country_short'
As it says, LP_IP2LocationR ecord has no attribute called
'country_short' . IP2LocationReco rd does.
Use the 'contents' attribute to dereference the pointer. That is:
yourstruct.cont ents.country_sh ort
That worked. Thank you!
>AttributeError : 'LP_IP2Location Record' object has no attribute
'country_short '
As it says, LP_IP2LocationR ecord has no attribute called
'country_short' . IP2LocationReco rd does.
Use the 'contents' attribute to dereference the pointer. That is:
yourstruct.cont ents.country_sh ort
On Apr 25, 5:39 am, "Jack" <nos...@invalid .comwrote:
IP2Location_get _all.restype = POINTER(IP2Loca tionRecord)
IP2LocationObj = IP2Location_ope n(thisdir + '/IP-COUNTRY-SAMPLE.BIN')
rec = IP2Location_get _all(IP2Locatio nObj, '64.233.167.99' )
print rec.country_sho rt
print rec.contents.co untry_short This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
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