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File reading....

Started by demonrealms Jun 1, 2003 at 3:07 PM 2 replies 500+ views

Original Post

Jun 1, 2003 at 3:07 PM

How do you make it so(using visual c++ 6.0) your program will read a fiel line by line? I can get it to read one line and that''s it. Heres my code:

char system[180];
ifstream system_01( "tower.data" );
system_01 >> system;
system_01.close();
cout << system << endl;

how do I get it to read line by line? And if you could, how do you get it to find and read a certian line, then stop reading by a * symbol?

Lektrix

Jun 1, 2003 at 5:00 PM

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

int main()
{
    ...

    std::ifstream system_01("tower.data");

    std::string line;
    std::getline(system_01, line);

    ...

    std::cout << line << std::endl;

    ...

    return 0;
}

getline()

takes the form of:


std::getline(std::ostream& os, std::string& str, char delim = '\n');

So, in my example, it will read from system_01 until it reaches the last paramter (defaulted to the newline character ('\n')), placing it in line. So, for stopping at the '*' symbol, you would do something like:


std::getline(system_01, line, '*');

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[edited by - Lektrix on June 1, 2003 6:03:54 PM]

demonrealms

Jun 1, 2003 at 7:04 PM

It only oputs one line though, why?

demonrealms

Jun 1, 2003 at 7:08 PM

Never mind, it works except one problem...
when I put the * it only puts a space in beween the lines.
then it continues going.

std::ifstream system_01("tower.txt");
	while(!system_01.eof())
	{
		std::string line;
		std::getline(system_01, line, '*');
		std::cout << line << std::endl;
	}

Anyone know why?

[edited by - demonrealms on June 1, 2003 8:16:56 PM]

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