嵌入式python在c ++上的覆盆子pi

时间:2015-08-05 03:37:03

标签: python c++ raspberry-pi python-embedding

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。

1 个答案:

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