I have been trying to embed python into c. I am on Linux Mint 17 and installed python-dev. I have been following the documentation on https://docs.python.org/2/extending/embedding.html I was able to compile the first example using the following.
我一直在尝试将python嵌入到c中,我在Linux Mint 17上安装了python-dev。我一直在跟踪https://docs.pythonorg/2/extending/嵌入式.html的文档,我可以使用下面的方法编译第一个示例。
#include <Python.h>
int
main(int argc, char *argv[])
{
Py_SetProgramName(argv[0]); /* optional but recommended */
Py_Initialize();
PyRun_SimpleString("from time import time,ctime\n"
"print 'Today is',ctime(time())\n");
Py_Finalize();
return 0;
}
I compiled using gcc with this command:
我用这个命令编译了gcc:
gcc `python2.7-config --cflags` test.c -o test `python2.7-config --ldflags`
The program compiles fine and works. When I tried to compile the pure embedding example here:
该程序编译良好并有效。当我尝试编译纯嵌入例子时:
#include <Python.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 = PyString_FromString(argv[1]);
/* 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 = 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;
}
I used the same gcc compile command and I got the following error:
我使用了相同的gcc编译命令,我得到了以下错误:
test.c: In function ‘main’:
test.c:6:33: warning: unused variable ‘pDict’ [-Wunused-variable]
PyObject *pName, *pModule, *pDict, *pFunc;
Why does this happen and how do I solve this?
为什么会这样,我怎么解这个?
1 个解决方案
#1
1
It means exactly what the warning says: You are declaring a variable but are not using it anywhere. Just delete pDict and you'll be fine:
这就意味着警告说:您声明了一个变量,但是没有在任何地方使用它。只要删除命令,你就会没事:
PyObject *pName, *pModule, *pFunc;
#1
1
It means exactly what the warning says: You are declaring a variable but are not using it anywhere. Just delete pDict and you'll be fine:
这就意味着警告说:您声明了一个变量,但是没有在任何地方使用它。只要删除命令,你就会没事:
PyObject *pName, *pModule, *pFunc;