嵌入式Python 2.7.2从用户定义的目录导入模块 [英] Embedded Python 2.7.2 Importing a module from a user-defined directory
问题描述
我正在将Python嵌入到具有已定义API的C/C ++应用程序中.
I'm embedding Python into a C/C++ application that will have a defined API.
应用程序需要实例化脚本中定义的类,这些类的结构大致如下:
The application needs to instantiate classes defined in a script, which are structured roughly like this:
class userscript1:
def __init__(self):
##do something here...
def method1(self):
## method that can be called by the C/C++ app...etc
我过去曾为(概念验证)设法使用以下类型的代码来完成此任务:
I've managed in the past (for the proof-of-concept) to get this done using the following type of code:
PyObject* pName = PyString_FromString("userscript.py");
PyObject* pModule = PyImport_Import(pName);
PyObject* pDict = PyModule_GetDict(pModule);
PyObject* pClass = PyDict_GetItemString(pDict, "userscript");
PyObject* scriptHandle = PyObject_CallObject(pClass, NULL);
现在我更多地处于生产环境中,这在PyImport_Import行上失败了-我认为这可能是因为我试图在目录前添加脚本名称,例如
Now that I'm in more of a production environment, this is failing at the PyImport_Import line - I think this might be because I'm trying to prepend a directory to the script name, e.g.
PyObject* pName = PyString_FromString("E:\\scriptlocation\\userscript.py");
现在,为了让您了解我已经尝试过的方法,我尝试在所有这些调用之前修改系统路径,以使其搜索此模块.基本上尝试以编程方式修改sys.path:
Now, to give you an idea of what I've tried, I tried modifying the system path before all of these calls to make it search for this module. Basically tried modifying sys.path programmatically:
PyObject* sysPath = PySys_GetObject("path");
PyObject* path = PyString_FromString(scriptDirectoryName);
int result = PyList_Insert(sysPath, 0, path);
这些行运行正常,但对使我的代码正常工作没有任何作用.显然,我的实际代码中有很多错误检查已排除在外,所以不必担心!
These lines run ok, but have no effect on making my code work. Obviously, my real code has a boatload of error checking that I have excluded so don't worry about that!
所以我的问题是:如何将嵌入式解释器适当地定向到我的脚本,以便实例化这些类?
So my question: how do I direct the embedded interpreter to my scripts appropriately so that I can instantiate the classes?
推荐答案
您需要指定userscript
,而不是userscript.py
也要使用PyImport_ImportModule
,它直接需要char *
you need to specify userscript
and not userscript.py
also use PyImport_ImportModule
it directly takes a char *
userscript.py
表示软件包userscript
此代码对我有用:
#include <stdio.h>
#include <stdlib.h>
#include <Python.h>
int main(void)
{
const char *scriptDirectoryName = "/tmp";
Py_Initialize();
PyObject *sysPath = PySys_GetObject("path");
PyObject *path = PyString_FromString(scriptDirectoryName);
int result = PyList_Insert(sysPath, 0, path);
PyObject *pModule = PyImport_ImportModule("userscript");
if (PyErr_Occurred())
PyErr_Print();
printf("%p\n", pModule);
Py_Finalize();
return 0;
}
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