C-pythonapi中的分配对象和调用方法

2024-09-30 20:18:44 发布

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我想实例化一个类并使用cpythonapi调用它的方法。我不知道如何调用对象的方法。我使用的是python2.7和gcc版本6.3.0 20170516(Debian 6.3.0-18+deb9u1) python代码:

类mathops: def倍增(a,b): 打印“将计算”,a,“次数”,b c=0 对于范围(0,a)内的i: c=c+b 返回c

C代码:

#include <Python.h>

int
main(int argc, char *argv[])
{
PyObject *pName, *pModule, *pFunc;
PyObject *pArgs, *pValue;
int i;

if (argc < 3) {
    fprintf(stderr,"Usage: call pythonfile funcname [args]\n");
    return 1;
}

Py_Initialize();
pName = PyString_FromString(argv[1]);
/* Error checking of pName left out */

PyRun_SimpleString("import sys");
PyRun_SimpleString("sys.path.append(\".\")");

pModule = PyImport_Import(pName);
Py_DECREF(pName);

if (pModule != NULL) {

    pClass = PyObject_GetAttrString(pModule, argv[2]);

    //pFunc = PyObject_GetAttrString(pModule, argv[2]);
    /* pFunc is a new reference */

    if (pFunc && PyCallable_Check(pFunc)) {
        pObject = PyObject_CallObject(pClass, NULL)¶

/*如何调用方法?*/

        pArgs = PyTuple_New(argc - 3);
        for (i = 0; i < argc - 3; ++i) {
            pValue = PyInt_FromLong(atoi(argv[i + 3]));
            if (!pValue) {
                Py_DECREF(pArgs);
                Py_DECREF(pModule);
                fprintf(stderr, "Cannot convert argument\n");
                return 1;
            }
            /* pValue reference stolen here: */
            PyTuple_SetItem(pArgs, i, pValue);
        }
        pValue = PyObject_CallObject(pFunc, pArgs);
        Py_DECREF(pArgs);
        if (pValue != NULL) {
            printf("Result of call: %ld\n", PyInt_AsLong(pValue));
            Py_DECREF(pValue);
        }
        else {
            Py_DECREF(pFunc);
            Py_DECREF(pModule);
            PyErr_Print();
            fprintf(stderr,"Call failed\n");
            return 1;
        }
    }
    else {
        if (PyErr_Occurred())
            PyErr_Print();
        fprintf(stderr, "Cannot find function \"%s\"\n", argv[2]);
    }
    Py_XDECREF(pFunc);
    Py_DECREF(pModule);
}
else {
    PyErr_Print();
    fprintf(stderr, "Failed to load \"%s\"\n", argv[1]);
    return 1;
}
Py_Finalize();
return 0;

}


Tags: pyreturnifstderrpyobjectargvargcpvalue