CSV文件C++操作库：MiniCSV
g2b4
9年前
MiniCSV 是一个基于c++文件流的小巧而灵活的 CSV 库。
Writing
We see an example of writing tab-separated values to file usingcsv::ofstreamclass. Tab is a perfect separator to use because it seldom appear in the data. I have once encountered a comma in company name which ruined the CSV processing.
#include "minicsv.h" struct Product { Product() : name(""), qty(0), price(0.0f) {} Product(std::string name_, int qty_, float price_) : name(name_), qty(qty_), price(price_) {} std::string name; int qty; float price; }; int main() { csv::ofstream os("products.txt", std::ios_base::out); os.set_delimiter('\t'); if(os.is_open()) { Product product("Shampoo", 200, 15.0f); os << product.name << product.qty << product.price << NEWLINE; Product product2("Soap", 300, 6.0f); os << product2.name << product2.qty << product2.price << NEWLINE; } os.flush(); return 0; }NEWLINEis defined as'\n'. We cannot usestd::endlhere becausecsv::ofstreamis not derived from thestd::ofstream.
Reading
To read back the same file,csv::ifstreamis used andstd::coutis for displaying the read items on the console.
#include "minicsv.h" #include <iostream> int main() { csv::ifstream is("products.txt", std::ios_base::in); is.set_delimiter('\t'); if(is.is_open()) { Product temp; while(is.read_line()) { is >> temp.name >> temp.qty >> temp.price; // display the read items std::cout << temp.name << "," << temp.qty << "," << temp.price << std::endl; } } return 0; }The output in console is as follows.
Shampoo,200,15 Soap,300,6