main.cpp

#include <Python.h>
#include <iostream>
#include <Windows.h>
#include <cmath>
#include <string>
#include <fstream>
#include <iomanip>

using namespace std;

/*
Description:
To call this function, simply pass the function name in Python that you wish to call.
Example:
callProcedure("printsomething");
Output:
Python will print on the screen: Hello from python!
Return:
None
*/
void CallProcedure(string pName)
{
	char* procname = new char[pName.length() + 1];
	std::strcpy(procname, pName.c_str());

	Py_Initialize();
	PyObject* my_module = PyImport_ImportModule("CS210_Starter_PY_Code");
	PyErr_Print();
	PyObject* my_function = PyObject_GetAttrString(my_module, procname);
	PyObject* my_result = PyObject_CallObject(my_function, NULL);
	Py_Finalize();

	delete[] procname;
}

/*
Description:
To call this function, pass the name of the Python functino you wish to call and the string parameter you want to send
Example:
int x = callIntFunc("PrintMe","Test");
Output:
Python will print on the screen:
You sent me: Test
Return:
100 is returned to the C++
*/
int callIntFunc(string proc, string param)
{
	char* procname = new char[proc.length() + 1];
	std::strcpy(procname, proc.c_str());

	char* paramval = new char[param.length() + 1];
	std::strcpy(paramval, param.c_str());


	PyObject* pName, * pModule, * pDict, * pFunc, * pValue = nullptr, * presult = nullptr;
	// Initialize the Python Interpreter
	Py_Initialize();
	// Build the name object
	pName = PyUnicode_FromString((char*)"CS210_Starter_PY_Code");
	// Load the module object
	pModule = PyImport_Import(pName);
	// pDict is a borrowed reference
	pDict = PyModule_GetDict(pModule);
	// pFunc is also a borrowed reference
	pFunc = PyDict_GetItemString(pDict, procname);
	if (PyCallable_Check(pFunc))
	{
		pValue = Py_BuildValue("(z)", paramval);
		PyErr_Print();
		presult = PyObject_CallObject(pFunc, pValue);
		PyErr_Print();
	}
	else
	{
		PyErr_Print();
	}
	//printf("Result is %d\n", _PyLong_AsInt(presult));
Py_DECREF(pValue);
// Clean up
Py_DECREF(pModule);
Py_DECREF(pName);
// Finish the Python Interpreter
Py_Finalize();

// clean
delete[] procname;
delete[] paramval;


return _PyLong_AsInt(presult);
}

/*
Description:
To call this function, pass the name of the Python functino you wish to call and the string parameter you want to send
Example:
int x = callIntFunc("doublevalue",5);
Return:
25 is returned to the C++
*/
int callIntFunc(string proc, int param)
{
	char* procname = new char[proc.length() + 1];
	std::strcpy(procname, proc.c_str());

	PyObject* pName, * pModule, * pDict, * pFunc, * pValue = nullptr, * presult = nullptr;
	// Initialize the Python Interpreter
	Py_Initialize();
	// Build the name object
	pName = PyUnicode_FromString((char*)"CS210_Starter_PY_Code");
	// Load the module object
	pModule = PyImport_Import(pName);
	// pDict is a borrowed reference
	pDict = PyModule_GetDict(pModule);
	// pFunc is also a borrowed reference
	pFunc = PyDict_GetItemString(pDict, procname);
	if (PyCallable_Check(pFunc))
	{
		pValue = Py_BuildValue("(i)", param);
		PyErr_Print();
		presult = PyObject_CallObject(pFunc, pValue);
		PyErr_Print();
	}
	else
	{
		PyErr_Print();
	}
	//printf("Result is %d\n", _PyLong_AsInt(presult));
	Py_DECREF(pValue);
	// Clean up
	Py_DECREF(pModule);
	Py_DECREF(pName);
	// Finish the Python Interpreter
	Py_Finalize();

	// clean
	delete[] procname;

	return _PyLong_AsInt(presult);
}


int main()
{

	string num1;
	int choice;
	string printH;
	ifstream inFS("frequency.dat");
	string itemName;
	int itemQuantity;



	do {
		cout << "\n1: Create a list of all items purchased with quantities" << endl;
		cout << "2: Create a number of how many times an item was purchased" << endl;
		cout << "3: Create a histogram of all items purchased in a day" << endl;
		cout << "Enter your selection as a number 1, 2, 3, or 4 to exit." << endl;
		cin >> choice;   // accepting user input
		switch (choice)
		{
		case 1:
			CallProcedure("ReadFile");  // pulling python function
			break;
		case 2:
			cout << "Select an item from the list, please select following option for list of items" << endl;
			cin >> num1;  // user input

			num1[0] = toupper(num1[0]);  // fixes user input to have first letter capitalized
			cout << callIntFunc("ItemCount", num1);  // utilizes function and takes userinput
			break;
		case 3:

			CallProcedure("Histogram");  // pulls from function

			inFS.open("frequency.dat");        //Open frequency.dat

			if (inFS.is_open())  // test condition to see file is open
			{
				cout << "File is good to read!\n press option three again" << endl;

				while ((getline(inFS, itemName, ' ') && (inFS >> itemQuantity))) 
				{
					cout << itemName << " "; // prints(myfile, first item line with space in between
				

					for (int i = 0; i < itemQuantity; i++)  // loop to get histogram
					{
						cout << "*";
					}
					cout << endl;
				}
				{		
				}
				inFS.close();   // closing the file

				break;

		case 4:
			cout << "Exiting program" << endl;
			exit(3);
			return 3;  // exits program
		default:
			cout << "Invalid selection" << endl;   // telling the user they selected a wrong input
			break;
			}
		}
		} while (choice > 0 || choice <= 3);
		// validates user input
		return 0;
	}