readingcsv.cpp

来自「read from .csv files」· C++ 代码 · 共 52 行

#include "stdafx.h"
#include <algorithm>
#include <iostream>
#include <string>
#include <fstream>
#include <sstream>
#include <vector>
using namespace std;

void readCSV(istream &input, vector<vector<string>> &output)
{
	string csvLine;
	// read every line from the stream
	while(getline(input, csvLine))
	{
		istringstream csvStream(csvLine);
		vector<string> csvColumn;
		string csvElement;
		// read every element from the line that is seperated by commas
		// and put it into the vector or strings
		while(getline(csvStream, csvElement, ','))
		{
			csvColumn.push_back(csvElement);
		}		
		output.push_back(csvColumn);
	}
}

int main()
{
	fstream file("TOPSIS-in.csv", fstream::in);
	if(!file.is_open())
	{
		cout << "File not found!\n";
		return 1;
	}
	// typedef to save typing for the following object
	typedef vector< vector<string> > csvVector;
	csvVector csvData;

	readCSV(file, csvData);
	// print out read data to prove reading worked
	for(csvVector::iterator i = csvData.begin(); i != csvData.end(); ++i)
	{
		for(vector<string>::iterator j = i->begin(); j != i->end(); ++j)
		{
			cout << *j << ", ";
		}
			cout << "\n";
	}
}