file - How i can select the file and my program show the things in it?

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C++

#include "stdafx.h"
#include<iomanip>
#include <fstream>
#include<iostream>
using namespace std;
#include <iostream>
#include <iomanip>
#include <fstream>
using namespace std;
int main() {
    ifstream inFile;
    inFile.open("C:\\Users\Public\Documents\c++ test for overloading\alaki\test.data");
    if (!inFile) {
        cout << "Unable to open file";
        exit(1);
    inFile.close();
    return 0;
   }
}

How I can select the file and let my program show the things in it?

Posted 4-Feb-11 1:29am

mf_arian

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Andrew Brock · Accepted Answer · 2011-02-04T02:20:00

If you are doing it from the console, then you can use cin to get input.
You can use a loop of reading chunks and displaying it or adding it to a string to read the contents

#include <iomanip>
#include <fstream>
#include <iostream>
#include <string>
using namespace std;
int main() {
    ifstream inFile;
    string file;
    cout << "Enter a file name:" << endl;
    cin >> file;
    //All \ need to be escaped with a 2nd \ like "C:\\Users\\Public\\Documents\\c++ test for overloading\\alaki\\test.data"
    inFile.open(file.c_str());
    if (!inFile.is_open()) { //you cant check the class for inequality... you need to call the is_open() method to see if it opened properley
        cout << "Unable to open file";
        //inFile.close(); //dont need to close... it never opened
        return -1; //you dont need exit and a return
    }
    char szContents[128]; //This can be any size you like. Dont make it too big (say more than 4096) unless you use new or malloc to create it.
    while (!inFile.eof()) {
        memset(szContents, 0, sizeof(szContents)); //empty the buffer
        inFile.read(szContents, sizeof(szContents) - 1); //include space for terminator
        cout << szContents;
    }
    inFile.close();
    return 0;
}

Hans Dietrich · Accepted Answer · 2011-02-04T02:16:00

Solution 2

Not sure exactly what you're after, but as far as accessing files, note that all backslashes must be escaped in a string literal; you have escaped only the first backslash in

inFile.open("C:\\Users\Public\Documents\c++ test for overloading\alaki\test.data");

.

Posted 4-Feb-11 2:16am

Hans Dietrich

Comments

Olivier Levrey 4-Feb-11 8:17am

good remark!

mf_arian 4-Feb-11 8:20am

can you write in the way that you think is true , please?

Hans Dietrich 4-Feb-11 8:39am

Every occurrence of '\' in a string literal must be doubled: '\\', like 'C:\\Users...".

mf_arian 4-Feb-11 8:52am

I did it but it was not useful thanks