Simple question, hopefully an easy way and just want to verify I'm doing it the correct / efficient way.
I have a class T object, which is typically put into a vector that is created in my main() function. It can be any kind of data, string, int, float.. etc. I'm reading from a file... which is inputted from the user and passed onto t...
Say I do this (a contrived example):
#include <iostream>
#include <fstream>
using namespace std;
int main(int argc, char* argv[])
{
ifstream ifs(argv[1]);
char ch;
while(ifs.read(&ch, 1)) {
cout << ch;
}
}
I assume(hope) that the iostream library does some internal buffering here and doesn't turn this into g...
Hi, I wanna stop the reading of my text input file when the word "synonyms" appears. I'm using ifstream and I don't know how to break the loop. I tried using a stringstream "synonyms" but it ended up junking my bst. I included the complete project files below in case you wanna avoid typing.
Important part:
for(;;) /*here, I wanna b...
While reading a file (ifstream), is there any way to direct it to make a new line?
For instance, I would like for THIS to happen:
myfile>>array[1]>>array[2]>>endl;
Obviously, the "endl" just isn't allowed. Is there another way to do this?
Edit---thanks for the quick responses guys!
From a text file, I'm trying to store two strings...
I want to make the line marked with // THIS LINE SHOULD BE PRINTING do its thing, which is print the int values between "synonyms" and "antonyms".
This is the text file:
dictionary.txt
1 cute
2 hello
3 ugly
4 easy
5 difficult
6 tired
7 beautiful
synonyms
1 7
7 1
antonyms
1 3
3 1 7
4 5
5 4
7 3
#include <iostream>
#include <fstrea...
I want to eliminate the junk that I'm getting on the vector<int> synsAux below. It should print:
1
7
7
1
I'm getting an extra 2 before the first and third digit, why? Is this 2 an ascii value for the blank space or something? How do I avoid its reading?
This is the dictionary file needed to run the program:
dictionary.txt
1 cute
2 ...
I've been informed that my library is slower than it should be, on the order of 30+ times too slow parsing a particular file (text file, size 326 kb). The user suggested that it may be that I'm using std::ifstream (presumably instead of FILE).
I'd rather not blindly rewrite, so I thought I'd check here first, since my guess would be the...
how do i detect and move to the next line using std::ifstream?
void readData(ifstream& in)
{
string sz;
getline(in, sz);
cout << sz <<endl;
int v;
for(int i=0; in.good(); i++)
{
in >> v;
if (in.good())
cout << v << " ";
}
in.seekg(0, ios::beg);
sz.clear();
getline(in, sz);
cout...
I have this function to read in all ints from the file.
The problem is when i read letters i trigger a new line and i always seek by 1 and not to the end of line. How can i write this function better?
int v;
while (!in.eof())
{
while (in >> v)
cout << v << " ";
cout << endl;
if (in.eof())
break;
...
Greetings everyone, new to the forums :)
I'm currently writing a Simulated Annealing code to solve a traveling salesman problem and have run into difficulties with storing and using my read data from a txt file. Each row & column in the file represents each city, with the distance between two different cities stored as a 15 x 15 matrix:...
I want to read unsigned bytes from a binary file.
So I wrote the following code.
#include <iostream>
#include <fstream>
#include <vector>
#include <istream>
std::string filename("file");
size_t bytesAvailable = 128;
size_t toRead = 128;
std::basic_ifstream<unsigned char> inf(filename.c_str(), std::ios_base::in | std::ios_base::binary)...
Do I need to manually call close() when I use a std::ifstream?
For example in the code:
std::string readContentsOfFile(std::string fileName) {
std::ifstream file(fileName.c_str());
if (file.good()) {
std::stringstream buffer;
buffer << file.rdbuf();
file.close();
return buffer.str();
}
throw std::runt...
I've been all over the ifstream questions here on SO and I'm still having trouble reading a simple text file. I'm working with Visual Studio 2008.
Here's my code:
// CPPFileIO.cpp : Defines the entry point for the console application.
//
#include "stdafx.h"
#include <fstream>
#include <conio.h>
#include <iostream>
#include <string>
...
Hello,
I want the user to give me the full path where the file exists and not just the file name. How do I open the file this way?
Is it something like this:
ifstream file;
file.open("C:/Demo.txt", ios::in);
Because it doesnt seem to work..I think..
Thanks in advance,
Greg
...
Now I have a file with many data in it.
And I know the data I need begins at position (long)x and has a given size sizeof(y)
How can I get this data?
...
I know there's been a handful of questions regarding std::ifstream::open(), but the answers didn't solve my problem. Most of them were specific to Win32, and I'm using SDL, not touching any OS-specific functionality (...that's not wrapped up into SDL).
The problem is: std::ifstream::open() doesn't seem to work anymore since I've switche...
In VS 2005, I have some code that looks like this:
ifs.open("foo");
while (!ifs.eof())
{
ifs.read(&bar,sizeof(bar));
loc = ifs.tellg();
loc += bar.dwHeaderSize;
// four byte boundary padding
if ((loc % 4) != 0)
loc += 4 - (loc % 4);
ifs.seekg(loc,ios::beg);
}
ifs.close();
The code worked fine in VS 2005...
Hi,
I just took some older code of a file reader that had been developed under Linux and tried to use that very same code in my Windows project compiled with MSVC++7.1. The code compiled without any problems, but the file seemed to be empty according to the file reader on Windows.
I tracked the problem down to ifstream.readsome() that ...
Hello,
I'm learning C++ and i'm getting some troubles when i'm trying to use a String in a ifstream method, like this:
string filename;
cout << "Enter the name of the file: ";
cin >> filename;
ifstream file ( filename );
Here is the full code:
// obtaining file size
#include <iostream>
#include <fstream>
using namespace std;
int...
Must be a simple answer but I am at a loss, here is the code that is returning an error. I have tried with and without the starting slash.
I won't know the full path, I want it to be relative from the exe, and that is the relative path. I tried escaping the slashes.
My problem is that i get "error opening file" when the file is there. ...