C++ unable to read line by line a file via wstring utf-8

Question

#include <sstream> #include <fstream> #include <codecvt> #include <deque> #include <iostream> #include <fcntl.h> #include <io.h> int main() { _setmode(_fileno(stdout), _O_U8TEXT); std::wstring wstr; std::locale::global(std::locale(std::locale::empty(), new std::codecvt_utf8<wchar_t>)); std::deque<std::wstring> lines, words; std::wifstream wif(L"C:/Users/Administrator/source/repos/ConsoleApplication1/x64/Debug/data.txt"); if (wif.is_open()) { std::wstringstream wss; wss << wif.rdbuf(); wstr = wss.str(); wif.close(); } else { std::wcout << L"Не удалось открыть файл!"; } { std::wstringstream wss(wstr); std::wstring temp; while (std::getline(wss, temp, L'\n')) lines.push_back(temp); } { for (std::wstring i : lines) { std::wstringstream wss(i); std::wstring temp; while (std::getline(wss, temp, L' ')) words.push_back(temp); } } std::wcout << words[6]; }

01.01.2014 Старт Кошелёк 990 Изначально в кошельке было 990 руб 01.01.2014 Старт Карта 7000 А на карте 7000 20.09.2014 Кошелёк Проезд 70 Заплатил за проезд 20.09.2014 Кошелёк Базар 500 Купил фруктов на базаре asd 2014-09-21 Карта Книги 770.31 Купил книжку по карточке 2014-09-21 Карта Кошелёк 770.31 21.02.2014 Карта Кошелёк 1000 Снял тысячу в банкомате - - - - -

UPD. I need to skip lines with invalid date, invalid format... I forgot my iss... in order to fix line by line appending to deque... we do not care about commentary existance we care about existance 4 first items like date, source, destination, amount..

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Thomas Matthews
– Thomas Matthews

2021-11-25 19:22:29 +00:00
Commented Nov 25, 2021 at 19:22 — Thomas Matthews
– Thomas Matthews, Commented Nov 25, 2021 at 19:22
@ThomasMatthews, I trust this community more.

Lith
– Lith

2021-11-25 19:23:56 +00:00
Commented Nov 25, 2021 at 19:23 — Lith
– Lith, Commented Nov 25, 2021 at 19:23

Remy Lebeau · Accepted Answer · 2021-11-25 19:46:36Z

1

Since the comment text has spaces in it, use std::getline() instead of operator>> to read it, eg:

if (!((iss >> date_ >> source_ >> destination_ >> amount_) && getline(iss, comment_)))

Alternatively:

if (!(iss >> date_ >> source_ >> destination_ >> amount_)) { continue; } if (!getline(iss, comment_)) { continue; }

answered Nov 25, 2021 at 19:46

Remy Lebeau

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4 Comments

Lith Over a year ago

Thanks, however I still stuck at being unable to read anything. What is really surprises me.

Remy Lebeau Over a year ago

@Lith are you saying that while (std::getline(infile, line)) is not reading anything at all?

Lith Over a year ago

I found some other stackoverflow answers, thankfully I am still unable to parse line by line this file. I only got one element a first line and not fully. My output is : Файл прочитан, закрываем!01.01.2014 Старт

Remy Lebeau Over a year ago

@Lith what's with the for loop that is removing L'\0' characters? After UTF-8 decoding, a text file shouldn't have any null characters in it. Besides, your while loop is calling getline() with L'\0' for the delimiter, so wline won't have any L'\0' in it anyway, and you not even using the stripped convert for anything, so the for loop is completely wasted. Also, your outer while loop should be calling getline() with L'\n' as the delimiter, not L'\0'.

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C++ unable to read line by line a file via wstring utf-8

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