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How to read and parse CSV files in C++?
You should really be using a library to parsing CSV files in C++ as there are many cases that you can miss if you read files on your own. The boost library for C++ provides a really nice set of tools for reading CSV files. For example,
example
#include<iostream>
vector<string> parseCSVLine(string line){
using namespace boost;
std::vector<std::string> vec;
// Tokenizes the input string
tokenizer<escaped_list_separator<char> > tk(line, escaped_list_separator<char>
('\', ',', '\"'));
for (auto i = tk.begin(); i!=tk.end(); ++i)
vec.push_back(*i);
return vec;
}
int main() {
std::string line = "hello,from,here";
auto words = parseCSVLine(line);
for(auto it = words.begin(); it != words.end(); it++) {
std::cout << *it << std::endl;
}
}output
This will give the output −
hello from here
Another way is to use a delimiter to split a line and take it in an array −
Example
Another way is to provide a custom delimiter to split the string by using the getline function −
#include <vector>
#include <string>
#include <sstream>
using namespace std;
int main() {
std::stringstream str_strm("hello,from,here");
std::string tmp;
vector<string> words;
char delim = ','; // Ddefine the delimiter to split by
while (std::getline(str_strm, tmp, delim)) {
// Provide proper checks here for tmp like if empty
// Also strip down symbols like !, ., ?, etc.
// Finally push it.
words.push_back(tmp);
}
for(auto it = words.begin(); it != words.end(); it++) {
std::cout << *it << std::endl;
}
}Output
This will give the output −
hello from here
Updated on: 11-Feb-2020
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