写入文件时不能使用getline？

Question

I am trying to write a string set by the cin command to a file. I have it working, but it is not writing all of the string; just everything ebfore the first white space. So someone suggested I use:

Write_Test << getline( Text , cin );

To make it accept white spaces, but as the title says I cant use getline?

All code:

string Text;
        cout << "Write something: ";
        cin >> Text;
        if (Text != "")
        {           
            ifstream Write_Test("Write_Test.txt");//Creating the file       
            //Write_Test << Text;       //Write a message to the file.
            Write_Test << getline( Text , cin );
            Write_Test.close();                 //Close the stream, meaning the file will be saved.     
            cout << "Done!";
        }

Thanks for any help!

Answer 1

First of all, you probably meant to write

std::getline(std::cin, Text)

This expression take an std::istream& and returns this std::istream& . Assuming you got the arguments of getline() right, the expression

out << std::getline(std::cin, Text)

actually write the stream state of std::cin to out . This may be what you wanted but my guess is that you actually meant to use

if (std::getline(std::cin, Text)) {
    WriteTest << Text;
}

This should write a line of text read from std::cin to WriteTest .

A complete program would look something like this:

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>

int main()
{
    std::ofstream out("WriteTest.txt");
    if (!out) {
        std::cout << "Error: failed to open output file\n";
        return EXIT_FAILURE;
    }
    std::string text;
    if (std::getline(std::cin, text)) {
        out << text << '\n';
    }
    else {
        std::cout << "Error: failed to read a line\n";
}