我试图从Python网站https://docs.python.org/3/extending/embedding.html编译示例代码。除了下面这一行,一切都很好:
pName = PyUnicode_DecodeFSDefault(argv[1]);
我在我的MacOS El Captain上安装了python3.6。我的make文件如下所示:
^{pr2}$ < >编译C++代码时,我得到以下错误:gcc -c call_function.cpp -I/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m
call_function.cpp:16:13: error: use of undeclared identifier 'PyUnicode_DecodeFSDefault'
pName = PyUnicode_DecodeFSDefault(argv[1]);
^
1 error generated.
有人知道如何修正上述错误吗?我将非常感谢你的帮助。在
下面是完整的示例代码:
#include <Python/Python.h>
#include <Python/unicodeobject.h>
int main(int argc, char *argv[])
{
PyObject *pName, *pModule, *pDict, *pFunc;
PyObject *pArgs, *pValue;
int i;
if (argc < 3) {
fprintf(stderr,"Usage: call pythonfile funcname [args]\n");
return 1;
}
Py_Initialize();
pName = PyUnicode_DecodeFSDefault(argv[1]);
// pName = PyUnicode_FromString(argv[1]); <-- also gives me an error
/* Error checking of pName left out */
pModule = PyImport_Import(pName);
Py_DECREF(pName);
if (pModule != NULL) {
pFunc = PyObject_GetAttrString(pModule, argv[2]);
/* pFunc is a new reference */
if (pFunc && PyCallable_Check(pFunc)) {
pArgs = PyTuple_New(argc - 3);
for (i = 0; i < argc - 3; ++i) {
pValue = PyLong_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", PyLong_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;
}
我知道问题出在哪里。include
<Python/Python.h>
语句实际上链接到/System/Library/Frameworks/Python.framework/Versions/Current
,它目前是Python2.7。我已经在我的Mac上安装了python3.6,即使我在make文件中包含/Library/Frameworks/Python.framework/Versions/3.6/include/python3.6m
,它仍然引用MacOS的python2.7文件夹中的Python.h文件。我试图将当前的符号链接更改为新的3.6文件夹,但它不允许我进行更改。有人知道如何更改Python2.7当前文件夹的符号链接,这样gcc就可以使用python3.6文件夹来代替Python.h?在这个问题贴出来已经很久了,但是我想出的解决办法是:
您还应该检查argv[1]是否存在?在
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