I can't seem to find how to achieve this with fstream

[hunterb24]

I am trying to open a file that the user specifies and then read from that file. Here is my code. I cannot seem to get fstream to work with the cin file name.
Any help will be much appreciated.
Thanks!

#include <iostream>
#include <fstream>

int main()
{
char file[25];
std::cout << "***********************" << std::endl;
std::cout << "*  G R A D E B O O K  *" << std::endl;
std::cout << "***********************" << std::endl;
std::cout << "Please enter the name of the grade file: ";
std::cin >> file;

if (file)
std::cout << "Grade information read successfully..." << std::endl;
else
	std::cout << "Grade information  not read correctly..." << std::endl;

std::cout << "Menu" << std::endl;
std::cout << "----" << std::endl;

}

[Darkmaster]

http://www.cplusplus.com/doc/tutorial/files/

use std::string file;
check the value of file in a debugger, maybe you need to write "\\" for each new folder

[hunterb24]

i have tried, but cannot get it to work with a file determined by the user.

#include <iostream>
#include <fstream>

int main()
{
char file[25];
std::cout << "***********************" << std::endl;
std::cout << "*  G R A D E B O O K  *" << std::endl;
std::cout << "***********************" << std::endl;
std::cout << "Please enter the name of the grade file: ";
std::cin >> file;
std::ofstream file;

file.open();

if (file)
std::cout << "Grade information read successfully..." << std::endl;
else
	std::cout << "Grade information  not read correctly..." << std::endl;

std::cout << "Menu" << std::endl;
std::cout << "----" << std::endl;

}

[Darkmaster]

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

int main()
{
	std::string filepath, output;
	filepath="D:\\test.txt";
	std::ifstream file;
	file.open(filepath.c_str());

	if(file.is_open()){
		while(!file.eof()){
		file >> output;
		std::cout << output;
		}
	}
	file.close();
}

next time read the tutorial ;)
ofstream is for output, that's mentioned in the first line

[hunterb24]

on line 10 of your code is the same in mine, but eclipse is telling me that "statement cannot resolve address of overloaded function"

[Darkmaster]

yes, its the same but my file is an ifstream and yours an ofstream

[BrokenSilenceDev]

What compiler do you use?

[hunterb24]

#include <iostream>
#include <fstream>
#include <string>
int main()
{

std::string file;
std::cout << "***********************" << std::endl;
std::cout << "*  G R A D E B O O K  *" << std::endl;
std::cout << "***********************" << std::endl;
std::cout << "Please enter the name of the grade file: ";
std::cin >> file;

std::ifstream inFile;
inFile.open(file.c_str());



if (inFile)
	std::cout << "Grade information read successfully..." << std::endl;
else
	std::cout << "Grade information  not read correctly..." << std::endl;

}

I am getting the error here:

inFile.open(file.c_str());

scratch that, i'm not getting an error now...weird, but every time it says my file is not read correctly, what could cause this?

[BrokenSilenceDev]

What is the filename and what compiler are you using?

[hunterb24]

linux g++

[hunterb24]

the file name is input.txt, it's all in my eclipse workspace together

[BrokenSilenceDev]

Ah - ok. In Visual Studio when I debug it uses a directories relative to the project file, maybe your compiler is having a similar issue?

[hunterb24]

I don't see how it could since it's all in the workspace

[BrokenSilenceDev]

Sorry - I am not really familiar IDE s.

Try changing the if statement from if (inFile) to if (inFile.is_open())

[hunterb24]

it still prints out the else portion every time

[BrokenSilenceDev]

Ok, try sending the whole pathname as the filename: something like "C:\Users\...Additional Directories...\input.txt"

[hunterb24]

ok, so it works that way. Now to figure out why it won't work with the user input...hmmm

[BrokenSilenceDev]

Its likely an issue where the program tries to find the path or file relative to the program itself, or relative to the workspace.