Dear Erik, I highly appreciate you for taking the time and helping people. Basically, we have some mathematical problems in a GUI application implemented in Qt-C++ which sage is capable of computing them. This is why we decided to integrate sage in our app.
However, As you mentioned it is a very complex or even impossible task to integrate sage into a windows application since sage is a software suit rather than a python library. After googling some, I found another project called SageMathCell <https://sagecell.sagemath.org/> which provides REST <https://en.wikipedia.org/wiki/Representational_state_transfer> interface to a sage server. I guess this is the best of way achieving what we are looking for. Unless I'm very much mistaken, with SageMathCell we can run all sage scripts with peace of mind. As mentioned in this tutorial <http://analyticphysics.com/Coding%20Methods/Accessing%20SageMath%20as%20a%20Web%20Service.htm> one should URL encode the sage script and POST it to http://{IP address of your SageMathCell server}:8888/service. This perfectly works however I cannot it get to work for some scripts. For instance calling the service with below code works: QNetworkRequest request; request.setUrl(QUrl("http://192.168.224.130:8888/service";)); request.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded"); arrReqBody = "code=print(1+1)"; // This is the sage script which is put in HTTP body request arrReqBody = request.url().toPercentEncoding(arrReqBody, "=()[].:,"); QNetworkAccessManager *netMgr = new QNetworkAccessManager(); QObject::connect(netMgr, SIGNAL(finished(QNetworkReply*)), this, SLOT(sageReply(QNetworkReply*))); netMgr->post(request, arrReqBody); Which returns the result in stdout as shown below: "{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1, \"user_expressions\": {}, \"payload\": []}, \"success\": true, \"stdout\": \"2\\n\"}" On the other hand, changing sage script to below does not work. arrReqBody = "code='Y=Polyhedron(vertices=[(0,0,0,0,0,0,0,0),(0,0,0,1,0,1,0,1),(0,0,0,1,0,1,1,1),(0,0,0,1,1,1,0,1)])"; arrReqBody += "for v in Y.inequality_generator():print v'"; Above HTTP body returns below which states that the script has been successfully ran but I've no idea why stdout is missing. "{\"execute_reply\": {\"status\": \"ok\", \"execution_count\": 1, \"user_expressions\": {}, \"payload\": []}, \"success\": true}" My best guess is that there is something wrong about the encoding however no luck until now. I would appreciate it if someone could lend me a hand on this. Thanks, Javan On Wednesday, January 31, 2018 at 5:30:16 PM UTC+3:30, Erik Bray wrote: > > On Tue, Jan 30, 2018 at 2:35 PM, J. Javan <jafarj...@gmail.com > <javascript:>> wrote: > > I can see that you have successfully linked against sage. > > I also have a Qt GUI application which needs to do some mathematics in > the > > background. > > This application is targeted for windows platforms. I have installed > sage > > from this link. > > Could you please guide me on how to link my app with sage? > > > > I'm running your code as below > > > > #include <Python.h> > > > > > > int main(int argc, char *argv[]) > > > > { > > > > > > int retVal = 0; > > > > Py_Initialize(); > > > > PySys_SetArgv(argc, (wchar_t**) argv); > > > > printf("1+1:\n"); > > > > PyRun_SimpleString("print (1+1)"); > > > > printf("Load sage \n"); > > > > retVal = PyRun_SimpleString("from sage.all import *"); > > > > printf("Factor 2310:\n"); > > > > PyRun_SimpleString("print factor(2310)"); > > > > Py_Finalize(); > > > > return 0; > > > > } > > > > > > And this gives me the following output: > > > > 1+1: > > 2 > > Load sage > > Traceback (most recent call last): > > File "<string>", line 1, in <module> > > ModuleNotFoundError: No module named 'sage' > > Factor 2310: > > File "<string>", line 1 > > print factor(2310) > > ^ > > SyntaxError: invalid syntax > > Press <RETURN> to close this window... > > > > The output is clearly stating that sage cannot be found. > > This is because I have linked to my locally compiled python static > > libraries(Actually I have downloaded python source code and linked > against > > it.) which are not aware of sage. > > > > Also I tried to link against python provided in sage installation but I > > can't find any "python.lib" in it. > > I have also set an environment variable $SAGE_LOCAL pointing to > "C:\Program > > Files\SageMath 8.1\runtime\opt\sagemath-8.1\local" but no luck. > > > > Environment: > > Qt_v5.9 > > Windows 7 > > Python_v3.6.4 > > Sage_v8.1 > > Hi, > > I saw this mail forwarded to sage-devel, but it appears to be missing > quite a lot of context. What, specifically, is it that you're trying > to do? > > To be clear, Sage for Windows is not just a Python module. It's an > entire software suite, including its own Python interpreter. All of > it is complied with Cygwin. You won't be able to "import sage" from > different Python. > > If you're trying to build an application that uses Sage internally > somehow you have two choices really--build the entire software inside > Sage's environment (you can do this, for example, from the Sage Shell > which is really a Cygwin shell in the Sage environment). That is, > build all your software in Cygwin, linking with the Python in Sage, > etc. This can be tricky unless you know what you're doing with Sage's > development environment. > > Your other alternative is that you can always call Sage's Python from > outside Sage (but again, you'll still have to set a few environment > variables at a minimum), and depending on how Python is integrated > into your software this could mean anything from running the Python > interpreter as a subprocess and communicating with it, to dynamically > linking with the libpython DLL in Sage and running C Python code like > in your example above. Though to be honest I'm not exactly sure if > it's possible to link a Cygwin DLL into a non-Cygwin executable. But I > think maybe it's possible.... > > Please let me know more about what you're trying to do though and I > can probably be of more help. > > Best, > E > > > > On Wednesday, September 14, 2011 at 4:15:58 AM UTC+4:30, Michael > Rubinstein > > wrote: > >> > >> Thanks! That worked for me too, though I'm not sure how you decided on > >> the specific > >> choices of libraries to link to. > >> > >> Mike > >> > >> On Sep 13, 6:39 pm, Willem Jan Palenstijn <w...@usecode.org> wrote: > >> > On Tue, Sep 13, 2011 at 08:46:05AM -0700, Michael Rubinstein wrote: > >> > > >> > > I tried adding PySys_SetArgv(argc, argv); after Py_Initialize(); > >> > > It gets me further but then gives a strange error message: > >> > > >> > > Loading the Sage library... > >> > > >> > > ------------------------------------------------------------ > >> > > Unhandled SIGSEGV: A segmentation fault occurred in Sage. > >> > > This probably occurred because a *compiled* component > >> > > of Sage has a bug in it (typically accessing invalid memory) > >> > > or is not properly wrapped with _sig_on, _sig_off. > >> > > You might want to run Sage under gdb with 'sage -gdb' to debug > this. > >> > > Sage will now terminate (sorry). > >> > > ------------------------------------------------------------ > >> > > >> > I've just tried it here with your embed.c + PySys_SetArgv(argc, > argv), > >> > and it > >> > works for me when I link against libpython2.6 dynamically: > >> > > >> > $ gcc -I$SAGE_LOCAL/include/python2.6 embed.c -lpython2.6 -lm -lutil > >> > -lpthread -ldl -o embed > >> > $ ./embed > >> > 1+1: > >> > 2 > >> > Load sage > >> > Factor 2310: > >> > 2 * 3 * 5 * 7 * 11 > >> > $ > >> > > >> > This is 64 bit linux with sage 4.7.1rc1. > >> > > >> > -Willem Jan > > > > -- > > You received this message because you are subscribed to the Google > Groups > > "sage-devel" group. > > To unsubscribe from this group and stop receiving emails from it, send > an > > email to sage-devel+...@googlegroups.com <javascript:>. > > To post to this group, send email to sage-...@googlegroups.com > <javascript:>. > > Visit this group at https://groups.google.com/group/sage-devel. > > For more options, visit https://groups.google.com/d/optout. > -- You received this message because you are subscribed to the Google Groups "sage-devel" group. 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