请教牛牛们一个C++内嵌python的问题,谢谢    作者:rolyluo发表于2009-06-16 15:57:48

	   

	   本人对python外行,但有任务得内嵌python并调用它的一些函数

请牛牛们帮我看下下面这两段代码,



本来的打算是:从一个文件读入数据,然后用这些数据初始化一个对象,但这里通过python,使得执行过程变成用callFunc执行函数来生成对象了,使得我不知从哪里怎样读数据



我想请问的是:

1, 第一段中的模块module_ 与第二段中的callFunc函数的关系是什么?

2, 第一段中importResult 是执行了打开文件的返回,这与模块module_有什么关系?

3, callFunc里面的函数与importResult 执行的那个文件又有什么关系?



Configuration::Configuration(std::string filename, int argc, const char* argv[]) {

	Py_Initialize();

	module_ = PyImport_AddModule("__main__");

	dict_ = PyModule_GetDict(module_);

	// Run program parameters before the configuration file, in case any values are

	// needed for its initialization

	runArgs(argc, argv);

	int importResult = PyRun_SimpleString((std::string("from ") + filename + " import *").c_str());

	if (importResult == -1) {

		PyErr_Print();

		throwError("Error opening config file '" + filename + "'");

	}

	//PyObject *confMod = PyImport_ImportModuleLevel("configSW", dict_, dict_, 0, -1);

	//if (confMod == 0) {

	//	PyErr_Print();

	//	throwError("Error opening config file '" + filename + "'");

	//}

	// Run parameters again in case any of them were overwritten in the config file

	runArgs(argc, argv);

}

/////////////////////////////////////////////

template 

blitz::TinyVector Configuration::callFunc(std::string funcName, blitz::TinyVector point) {

	// If the point contains NaN, then return the zero vector

	if (isNaN(point(0)) || isNaN(point(1))) {

		return static_cast(0);

	}

	PyObject *func = PyDict_GetItemString(dict_, funcName.c_str());

	if (func == 0 || !PyCallable_Check(func)) {

		throwError(std::string("Error: Function '") + funcName + "' not found in configuration file");

	}

	PyObject *ret = PyObject_CallFunction(func, "dd", point(0), point(1));

	if(ret == 0) {

		PyErr_Print();

		throwError(std::string("Error calling function '") + funcName + "'");

	}

	blitz::TinyVector ans;

	if (PyTuple_Check(ret)) {

		if (PyTuple_Size(ret) < N) {

			throwError("Too few values returned from '" + funcName + "'");

		}

		for (int i = 0; i < N; ++i) {

			ans(i) = convert(PyTuple_GetItem(ret, i));

		}

	}

	else {

		if (N > 1) {

			throwError("Too few values returned from '" + funcName + "'");

		}

		ans(0) = convert(ret);

	}

	Py_XDECREF(ret);

	return ans;

}

////////////////////////////////////////////////

// Declare template specializations of the above function

template blitz::TinyVector Configuration::callFunc(std::string funcName, blitz::TinyVector point);

template blitz::TinyVector Configuration::callFunc(std::string funcName, blitz::TinyVector point);

template blitz::TinyVector Configuration::callFunc(std::string funcName, blitz::TinyVector point);