I slightly modified the python script in the link (I removed references to
odedell, whatever that is, and I called thecdll.LoadLibrary(...)
Here are my very minor edits:
import operatorfrom ctypes import *
IDEN="jcmd_python"
def mulall(arr): return reduce(operator.mul,arr,1)def run_jcmd( js):
j.JDo(p,IDEN+'=:'+js)def get_result(jdll,variable=IDEN):
pi=[pointer(c_int()) for _ in xrange(4)] j.JGetM(jdll,variable,*pi)
#datatype,rank, *shape, *value type=pi[0].contents.value if type==0:
#error return None,None,None,None rank=pi[1].contents.value
shape=list((c_int*rank).from_address(pi[2].contents.value))
flat_size=mulall(shape)
data=list((c_int*flat_size).from_address(pi[3].contents.value)) return
type,rank,shape,resize(shape,data)def resize(shap,dat): shap=shap[:]
flat_size=mulall(shap) while len(shap)>1: shd=[] start=0
last_size=shap.pop() while start<flat_size:
shd.append(dat[start:start+last_size]) start+=last_size
flat_size=len(shd) dat=shd else: shd=dat return shd
cdll.LoadLibrary("j801/bin/libj.so")j =
CDLL("j801/bin/libj.so")p=j.JInit()run_jcmd("i. 3
3")type,rank,shape,data=get_result(p) #returns the last resultprint
shape,datarun_jcmd("abc=: i: 5")print get_result(p,"abc")
This worked!
I ran it and output:
[3, 3] [[0, 1, 2], [3, 4, 5], [6, 7, 8]](4, 1, [11], [-5, -4, -3, -2, -1, 0, 1,
2, 3, 4, 5])
Thanks!
> Date: Fri, 18 Jul 2014 22:19:47 -0400
> From: [email protected]
> To: [email protected]
> Subject: Re: [Jprogramming] Calling j.dll from python
>
> Jon - it's trickier than I thought.
>
>
> I have a partial implementation working that I can tinker with tomorrow
>
> You need to use WinDLL on windows to get the calling convention right
>
> J = WinDLL("c:/users/jbogner/downloads/j801_win32/bin/j.dll")
> jt = J.JInit()
> J.JDo(jt, "A=:i.5")
> Out[34]: 0
>
> see http://www.jsoftware.com/pipermail/programming/2013-November/033974.html
> for details on how to get the values. I have modified the code to work
> with WinDLL and have something roughly working but ran out of time to work
> on it more tonight
>
>
> On Fri, Jul 18, 2014 at 7:54 PM, Jon Hough <[email protected]> wrote:
>
> > I am interested in calling J specifically from Python, preferably on Linux
> > and Windows (and Mac).
> > As Joe suggested, I've tried playing with jdll.ijs.
> > I still can't get JGetM to work, but I'll have another bash at it later
> > today.
> > Thanks!
> >
> > > From: [email protected]
> > > Date: Sat, 19 Jul 2014 07:27:03 +0800
> > > To: [email protected]
> > > Subject: Re: [Jprogramming] Calling j.dll from python
> > >
> > > Set and get data using j.dll can be quite involving. If you use windows,
> > it is much easier you to use to ole/com interface, search jwiki for more
> > info. Note that j8 only support the jdllserver interface.
> > >
> > > On 18.07.2014, at 23:05, Jon Hough <[email protected]> wrote:
> > >
> > > > Thanks,
> > > > My test script, so far, is
> > > >
> > > > from ctypes import *
> > > >
> > > > cdll.LoadLibrary("j801/bin/libj.so")
> > > > j = CDLL("j801/bin/libj.so")
> > > > jt = j.JInit()
> > > >
> > > > j.JDo(jt, "a =: 1")
> > > >
> > > > a =j.JGetM( "a")
> > > >
> > > > print a
> > > >
> > > > This returns 4, even though I set a to be 1. I'm assuming 4 is the
> > number of bytes returned (i.e. an int)??(By the way, if I do j.JGetM(jt,
> > "a") I get a seg fault.Regarding jdll.ijs, unfortunately my J-skills are
> > not powerful enough yet to make much sense of it:
> > > > jget=: 3 : 0cmd=. libj,' JGetM i x *c *x *x *x *x''e p n t r s d'=.
> > cmd cd pJ,(,y);4#<,0if. e do. smoutput 'error code: ',":e
> > return.end.(t,r,s) jfix d)
> > > > In particular
> > > > JGetM i x *c *x *x *x *x
> > > > is confusing.
> > > >> Date: Fri, 18 Jul 2014 10:53:44 -0400
> > > >> From: [email protected]
> > > >> To: [email protected]
> > > >> Subject: Re: [Jprogramming] Calling j.dll from python
> > > >>
> > > >> JGetM is what you need, but I strongly suggest reviewing
> > > >> http://jsoftware.com/wsvn/addons/trunk/general/misc/jdll.ijs (or
> > your local
> > > >> version) to get a better understanding of how things work
> > > >>
> > > >> This part addresses your question:
> > > >>
> > > >> jget=: 3 : 0
> > > >> cmd=. libj,' JGetM i x *c *x *x *x *x'
> > > >> 'e p n t r s d'=. cmd cd pJ,(,y);4#<,0
> > > >> if. e do.
> > > >> smoutput 'error code: ',":e
> > > >> return.
> > > >> end.
> > > >> (t,r,s) jfix d
> > > >> )
> > > >>
> > > >>
> > > >> On Fri, Jul 18, 2014 at 10:51 AM, Jon Hough <[email protected]>
> > wrote:
> > > >>
> > > >>> Please ignore the last sentence from my previous email. Copied and
> > pasted
> > > >>> by accident.
> > > >>>
> > > >>>> From: [email protected]
> > > >>>> To: [email protected]
> > > >>>> Date: Fri, 18 Jul 2014 15:50:41 +0100
> > > >>>> Subject: Re: [Jprogramming] Calling j.dll from python
> > > >>>>
> > > >>>> Joe, thanks. Your suggestion seems to work.
> > > >>>> However JGets seems to not exist.How do I then get the variable,
> > once
> > > >>> assigned?
> > > >>>> I tried to search through the .so/.dll for "get" functions:
> > > >>>>
> > > >>>> nm -g libj.so | grep Get
> > > >>>> Although jdll.ijs seems to contain jget, when I tried to call this
> > (in
> > > >>> Python) I get " undefined symbol: jget" (with variations on upper
> > and
> > > >>> lower cases)
> > > >>>>
> > > >>>>
> > > >>>>
> > > >>>>
> > > >>>> and couldn't find a function that seemed to get the variables.Also
> > I'm
> > > >>> having trouble finding libj.dll
> > > >>>>> Date: Fri, 18 Jul 2014 10:36:06 -0400
> > > >>>>> From: [email protected]
> > > >>>>> To: [email protected]
> > > >>>>> Subject: Re: [Jprogramming] Calling j.dll from python
> > > >>>>>
> > > >>>>> JInit() returns the instance that you need to invoke against
> > > >>>>>
> > > >>>>> see addons/general/misc/jdll.ijs
> > > >>>>>
> > > >>>>> jdo is defined as:
> > > >>>>>
> > > >>>>> jdo=: 3 : 0
> > > >>>>>
> > > >>>>> (libj,' JDo i x *c') cd pJ, boxopen y
> > > >>>>>
> > > >>>>> )
> > > >>>>>
> > > >>>>>
> > > >>>>> so I suspect you need to be passing that pointer address with
> > python
> > > >>> too...
> > > >>>>>
> > > >>>>>
> > > >>>>> jt = j.JInit()
> > > >>>>>
> > > >>>>> j.JDo(jt, "x =: 3")
> > > >>>>>
> > > >>>>>
> > > >>>>> [untested]
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> On Fri, Jul 18, 2014 at 10:33 AM, Thomas Costigliola <
> > > >>> [email protected]>
> > > >>>>> wrote:
> > > >>>>>
> > > >>>>>> Bill, Jon, sorry if that suggestion did not apply. I remembered it
> > > >>> was a
> > > >>>>>> common pitfall when calling from C. Maybe that is not the case
> > now.
> > > >>>>>>
> > > >>>>>>
> > > >>>>>> On Fri, Jul 18, 2014 at 10:29 AM, Jon Hough <[email protected]>
> > > >>> wrote:
> > > >>>>>>
> > > >>>>>>> My previous email was regarding Windows (7 with J801)
> > > >>>>>>> I just tried to do the same in Ubuntu (J801)
> > > >>>>>>> cdll.LoadLibrary("j801/bin/libj.so")
> > > >>>>>>> j = CDLL("j801/bin/libj.so")>>> j.JInit()158010848
> > > >>>>>>> No idea what the above output means. Is that the pointer address
> > of
> > > >>>>>>> something?
> > > >>>>>>> And then:
> > > >>>>>>>>>> j.JDo("x =: 3")Segmentation fault (core dumped)
> > > >>>>>>> And Python (2.7) crashed.
> > > >>>>>>>
> > > >>>>>>>> Date: Fri, 18 Jul 2014 22:09:28 +0800
> > > >>>>>>>> From: [email protected]
> > > >>>>>>>> To: [email protected]
> > > >>>>>>>> Subject: Re: [Jprogramming] Calling j.dll from python
> > > >>>>>>>>
> > > >>>>>>>> From which resource did you learn that(not python)? It should be
> > > >>> very
> > > >>>>>> out
> > > >>>>>>>> dated.
> > > >>>>>>>> On Jul 18, 2014 6:00 PM, "Jon Hough" <[email protected]>
> > > >>> wrote:
> > > >>>>>>>>
> > > >>>>>>>>> I am trying to call jdll.JDo from python but I get the error
> > > >>> message,
> > > >>>>>>>>> access violation.
> > > >>>>>>>>>
> > > >>>>>>>>> Here is my python.
> > > >>>>>>>>>
> > > >>>>>>>>> Cdll.LoadLibrary(path to j.dll)
> > > >>>>>>>>> J =CDLL(path to j.dll)
> > > >>>>>>>>>
> > > >>>>>>>>> J.JDo("x =: i. 3")
> > > >>>>>>>>>
> > > >>>>>>>>> This gives am error. In fact any string gives the error.
> > > >>>>>>>>>
> > > >>>>>>>>> J.JGet doesnt seem to give errors, but since I cannot set any j
> > > >>>>>>> variables,
> > > >>>>>>>>> it is not easy to test.
> > > >>>>>>>>>
> > > >>>>>>>>>
> > > >>>>>>
> > > >>>
> > ----------------------------------------------------------------------
> > > >>>>>>>>> For information about J forums see
> > > >>>>>> http://www.jsoftware.com/forums.htm
> > > >>>>>>>>>
> > > >>>>>>>>
> > > >>>
> > ----------------------------------------------------------------------
> > > >>>>>>>> For information about J forums see
> > > >>> http://www.jsoftware.com/forums.htm
> > > >>>>>>>
> > > >>>>>>>
> > > >>>
> > ----------------------------------------------------------------------
> > > >>>>>>> For information about J forums see
> > > >>> http://www.jsoftware.com/forums.htm
> > > >>>>>>>
> > > >>>>>>
> > > >>>
> > ----------------------------------------------------------------------
> > > >>>>>> For information about J forums see
> > > >>> http://www.jsoftware.com/forums.htm
> > > >>>>>>
> > > >>>>>
> > ----------------------------------------------------------------------
> > > >>>>> For information about J forums see
> > http://www.jsoftware.com/forums.htm
> > > >>>>
> > > >>>>
> > ----------------------------------------------------------------------
> > > >>>> For information about J forums see
> > http://www.jsoftware.com/forums.htm
> > > >>>
> > > >>>
> > ----------------------------------------------------------------------
> > > >>> For information about J forums see
> > http://www.jsoftware.com/forums.htm
> > > >>>
> > > >> ----------------------------------------------------------------------
> > > >> For information about J forums see
> > http://www.jsoftware.com/forums.htm
> > > >
> > > > ----------------------------------------------------------------------
> > > > For information about J forums see http://www.jsoftware.com/forums.htm
> > > ----------------------------------------------------------------------
> > > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> > ----------------------------------------------------------------------
> > For information about J forums see http://www.jsoftware.com/forums.htm
> >
> ----------------------------------------------------------------------
> For information about J forums see http://www.jsoftware.com/forums.htm
----------------------------------------------------------------------
For information about J forums see http://www.jsoftware.com/forums.htm
