Well, my plam, which may be stupid, is to create a pythin, tkinter UI and call j from this.
--- Original Message --- From: "Devon McCormick" <[email protected]> Sent: July 19, 2014 1:01 PM To: "J-programming forum" <[email protected]> Subject: Re: [Jprogramming] Calling j.dll from python For what you want to do, could you do it the other way around: call Python from J? Or, alternatively, invoke J on a command-line from Python? On Fri, Jul 18, 2014 at 10:31 PM, Jon Hough <[email protected]> wrote: > 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 > -- Devon McCormick, CFA ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
