[英]calling a method from a python interpreter
per Voo's advice on this thread:根据 Voo 对此线程的建议:
How can I "hook into" Python from C++ when it executes a function? 当它执行 function 时,如何从 C++ “挂钩” Python? My goal is to profile 我的目标是简介
I have opened up a new thread for a new question, which is, in C++, how can I initialize a PythonInterpreter and then call a method from it.我为一个新问题开辟了一个新线程,即在 C++ 中,如何初始化 PythonInterpreter,然后从中调用方法。 Specifically, I'd like to be able to call cProfile's methods and also get data from it.具体来说,我希望能够调用 cProfile 的方法并从中获取数据。
Okay that'll be a bit longer.好的,那会更长一点。 Note that I pretty much ignore all "usual" error checking - pretty much any python method may return NULL in which case you should handle that gracefully.请注意,我几乎忽略了所有“常规”错误检查 - 几乎任何 python 方法都可能返回 NULL 在这种情况下您应该优雅地处理它。 I show the "unusual" part checking if the given object is callable.我展示了“不寻常”部分,检查给定的 object 是否可调用。 Note that PyDECREF fails if the object pointer is NULL, Py_XDECREF does not.请注意,如果 object 指针为 NULL,则 PyDECREF 会失败,而 Py_XDECREF 不会。 And now to the code - there may be a better way to solve all this, but this works fine for me and sadly the documentation is extremely lacking.现在到代码 - 可能有更好的方法来解决所有这些问题,但这对我来说很好,遗憾的是文档非常缺乏。
C++ code: C++ 代码:
#include <Python.h>
static PyThreadState *mainstate;
void initPython(){
PyEval_InitThreads();
Py_Initialize();
mainstate = PyThreadState_Swap(NULL);
PyEval_ReleaseLock();
}
void exitPython(){
PyEval_AcquireLock();
PyThreadState_Swap(mainstate);
Py_Finalize();
}
void callScript() {
PyGILState_STATE gstate = PyGILState_Ensure();
PyObject *pName = PyUnicode_FromString("Startup");
PyObject *pModule = PyImport_Import(pName);
Py_DECREF(pName);
PyObject *pFunc = PyObject_GetAttrString(pModule, "startup");
if (pFunc && PyCallable_Check(pFunc)) {
PyObject *arglist = Py_BuildValue("(u)", "TestScript");
PyObject *result = PyObject_CallObject(pFunc, arglist);
Py_DECREF(arglist);
// Now you have the returned object of the function - do something with it.
// In our case that's None, but you should extend the python scrip to return
// whatever you need - see the profiler API.
Py_DECREF(result);
}
Py_XDECREF(pFunc); // XDECREF does not fail if pointer is NULL.
Py_DECREF(pModule);
PyGILState_Release(gstate);
}
int main() {
printf("Start.\n");
initPython();
callScript();
exitPython();
printf("Exit.\n");
return 0;
}
Your specific script that is always called, change this so that you return all the data you want in a useful manner - at the moment we just use cProfile.run() which just prints some information:始终调用您的特定脚本,更改它以便您以有用的方式返回所需的所有数据 - 目前我们只使用 cProfile.run() ,它只打印一些信息:
Startup.py
import cProfile
def startup(module_name):
print("Start script")
cProfile.run("import " + module_name)
print("Finished script")
Finally the trivial script that is executed:最后执行的简单脚本:
TestScript.py
sum = 0
for i in range(10000):
sum += i
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