Embedding Python in a C++ class -
hope guys can help. searched , googled not find solution. firstly code:
main.cpp #include <iostream> #include <iomanip> #include "togglelights.h" using namespace std; int main () { bool lightson; lights lightsgo(50); lightson=lightsgo.lightschanged(); return 0; } togglelights.cpp
#include "togglelights.h" using namespace std; lights::lights(const int getbrightness) { } bool lights :: lightschanged() { setenv("pythonpath",".",1); py_initialize(); state=pygilstate_ensure(); //pname = pystring_fromstring("lights"); pmodule = pyimport_importmodule("lights"); parg = py_buildvalue("(iii)", l_leftlightpin, l_rightlightpin,l_brightness); // pdict = pymodule_getdict(pmodule); pfunc = pyobject_getattrstring(pmodule,"setlights"); pret = pyeval_callobject(pfunc,parg); if (pystring_check(pret)) { py_decref(pvalue); py_decref(pmodule); py_decref(pname); py_finalize(); return true; } else { py_decref(pvalue); py_decref(pmodule); py_decref(pname); py_finalize(); return false; } } void lights::init_lights(const int getbrightness) { //setup * setup = setup::get(); l_leftlightpin=20; l_rightlightpin=21; l_brightness=getbrightness; } togglelights.h
#ifndef togglelights_h_included #define togglelights_h_included //# pragma once #include "python.h" using namespace std; //class setup; class lights { private: int l_leftlightpin; int l_rightlightpin; int l_brightness; public: pyobject *pname, *pmodule, *parg, *pfunc, *pret, *pvalue; pygilstate_state state; lights(const int getbrightness = 50); bool lightschanged(); void init_lights(const int getbrightness); //setup * setup ; }; #endif // togglelights_h_included lights.py
#!/usr/bin/env python2.7 # script alex eames http://raspi.tv #http://raspi.tv/2013/how-to-use-soft-pwm-in-rpi-gpio-pt-2-led-dimming-and-motor-speed-control # using pwm rpi.gpio pt 2 - requires rpi.gpio 0.5.2a or higher def setlights(pinl,pinr,level): import rpi.gpio gpio # needed rpi.gpio time import sleep # pull in sleep function time module gpio.setmode(gpio.bcm) # choose bcm or board numbering schemes. use bcm gpio.setup(25, gpio.out)# set gpio 25 output white led gpio.setup(24, gpio.out)# set gpio 24 output red led left = gpio.pwm(pinl, 100) # create object white pwm on port 25 @ 100 hertz right = gpio.pwm(pinr, 100) # create object red pwm on port 24 @ 100 hertz left.start(level) # start white led on 0 percent duty cycle (off) right.start(level) # red on (100%) # fun starts, we'll vary duty cycle # dim/brighten leds, 1 bright while other dim #pause_time = 0.02 # can change slow down/speed #try: # while true: # in range(0,101): # 101 because stops when finishes 100 # white.changedutycycle(i) # red.changedutycycle(100 - i) # sleep(pause_time) # in range(100,-1,-1): # 100 0 in steps of -1 # white.changedutycycle(i) # red.changedutycycle(100 - i) # sleep(pause_time) # except keyboardinterrupt: # white.stop() # stop white pwm output # red.stop() # stop red pwm output # gpio.cleanup() # clean gpio on ctrl+c exit as can still need finish python side not problem is.
everything builds in code::blocks (i code directly on pi) when press f8 step through code hassles start.
firsly error , did read compiler ignore don't know how in code::blocks. 1st prize rid of completely. here error:
>setting breakpoints >debugger name , version: gnu gdb (gdb) 7.4.1-debian >program received signal sigill, illegal instruction. >in ?? () (/usr/lib/arm-linux-gnueabihf/libcrypto.so.1.0.0) i use step out button continue debugging , reach lightson.cpp fun starts. execution of code jumps next line , previous. see below.
at /home/pi/pythonfiles/newtest/newtest/main.cpp:11 @ /home/pi/pythonfiles/newtest/newtest/main.cpp:12 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:26 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:24 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:26 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:27 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:28 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:30 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:31 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:30 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:31 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:33 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:31 @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:33 program received signal sigsegv, segmentation fault. in pyobject_getattrstring () (/usr/lib/libpython2.7.so.1.0) @ /home/pi/pythonfiles/newtest/newtest/lightson.cpp:33 i did put watch on variables , pmodule (line 30 of execution) example - gets value , set null executes second time.
i did test code previous time did not use classes , code ran fine.
could please explain , assist?
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