在我询问如何在python中调用c ++之前,这对我来说很难。后来我发现如果用c ++调用python似乎更容易。当我跟着the tutorial on codeproject时,我在编译时遇到了以下问题。
"pi@raspberrypi ~/New $ g++ led.cpp"
led.cpp:3:20: fatal error: Python.h: No such file or directory
compilation terminated.
我整天搜索了解决方案。我试过sudo apt-get install python-dev
(甚至其他版本,例如2.7,3.2等),但是一切都已经完全安装并且仍然会出错。我可以通过查找我的覆盆子pi的函数找到Python.h的位置。
最后我在某个网站上找到了以下解决方案:
pi@raspberrypi ~/New $ g++ $(python-config --includes) led.cpp
Python.h致命错误被驳回,并且出现以下错误。
/tmp/ccSIJpeH.o: In function `main':
led.cpp:(.text+0x30): undefined reference to `Py_Initialize'
led.cpp:(.text+0x44): undefined reference to `PyString_FromString'
led.cpp:(.text+0x54): undefined reference to `PyImport_Import'
led.cpp:(.text+0x64): undefined reference to `PyModule_GetDict'
led.cpp:(.text+0x84): undefined reference to `PyDict_GetItemString'
led.cpp:(.text+0x94): undefined reference to `PyCallable_Check'
led.cpp:(.text+0xbc): undefined reference to `PyObject_CallObject'
led.cpp:(.text+0xc4): undefined reference to `PyErr_Print'
led.cpp:(.text+0x158): undefined reference to `Py_Finalize'
collect2: ld returned 1 exit status
请告诉我如何解决这个问题!
附录:谢谢Nitori回答我的问题。我现在可以编译它。在编译之后,它创建了一个“a.out”文件,但是当我运行它时它什么都没做......
这是led.cpp的代码
// python functions from C code
//
#include <Python.h>
int main(int argc, char *argv[])
{
PyObject *pName, *pModule, *pDict, *pFunc, *pValue;
if (argc < 3)
{
printf("Usage: exe_name python_source function_name\n");
return 1;
}
// Initialize the Python Interpreter
Py_Initialize();
// Build the name object
pName = PyString_FromString(argv[1]);
// Load the module object
pModule = PyImport_Import(pName);
// pDict is a borrowed reference
pDict = PyModule_GetDict(pModule);
// pFunc is also a borrowed reference
pFunc = PyDict_GetItemString(pDict, argv[2]);
if (PyCallable_Check(pFunc))
{
PyObject_CallObject(pFunc, NULL);
} else
{
PyErr_Print();
}
// Clean up
Py_DECREF(pModule);
Py_DECREF(pName);
// Finish the Python Interpreter
Py_Finalize();
return 0;
}
这是我要调用的python代码。 led.py
import RPi.GPIO as GPIO
import time
def ledopen():
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.OUT)
GPIO.setup(27, GPIO.OUT)
GPIO.setup(22, GPIO.OUT)
GPIO.setup(18, GPIO.OUT)
GPIO.setup(23, GPIO.OUT)
GPIO.setup(24, GPIO.OUT)
GPIO.output(27, True)
GPIO.output(22, True)
GPIO.output(18, True)
GPIO.output(23, True)
GPIO.output(24, True)
GPIO.output(17, True)
time.sleep(5)
GPIO.output(27, False)
GPIO.output(22, False)
GPIO.output(18, False)
GPIO.output(23, False)
GPIO.output(24, False)
GPIO.output(17, False)
GPIO.cleanup()
return
ledopen()
我通过输入“sudo ./a.out led led ledopen”来调用该程序。它什么也没做。
答案 0 :(得分:1)
您还需要链接Python。对于您编译的方式,这应该有效:g++ $(python-config --includes --libs) led.cpp