Error in file reading with ifstream

Question

I'm having issue in the ifstream function, I have tried using the argv[1] as parameter but wont load the map, the map is located in the same folder of main code. I'm stucked here and can not debug.

#include <cstdlib>
#include <iostream>
#include <iomanip>
#include <fstream>
#include <sstream>
using namespace std;

int main (int argc, char *argv[]){

    int h;
    int w;
    int var;


    string inputLine;

    ifstream f;
    f.open("map.pgm",ios::in);
    if (!f){
        cout << "error" << endl;
        exit(1);
    }

I'm using Visual Studio 2017

In VS by default program current directory is not where source is, but executable. So either move you `map.pgm` there or specify full path — Slava, Mar 17 '17 at 14:28
Use Process Monitor to find out where it tries to load the map from — Thomas Weller, Mar 17 '17 at 14:28
***In VS by default program current directory is not where source is, but executable.*** This is wrong. In Visual Studio the default folder is the folder containing the project file unless you changed the default. This way if you run a Debug or Release configuration your data files are in the same place. — drescherjm, Mar 17 '17 at 14:30
Have you tried using the full path of the file, just to rule out the possibility that your application is looking in the wrong place? — Trevor, Mar 17 '17 at 14:37

score -1 · Answer 1 · edited May 23 '17 at 12:00

-1

Change this line:

if (!f){

by this:

if (!f.is_open()){

BTW you can check current directory path with GetModuleFileName

edited May 23 '17 at 12:00

Community

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answered Mar 17 '17 at 14:51

Rama

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Can you explain why you think this is a solution and why it's preferable to check for just this rather than any error on the stream? – Retired Ninja Mar 17 '17 at 16:32
Don't bother; it isn't. – Lightness Races in Orbit Mar 17 '17 at 16:32
@RetiredNinja Well OP stated that he is stuck, and can't debug. So I think checking the file is in right place and opened is a good start. Don't you? – Rama Mar 17 '17 at 17:07
1

`if(!f)` is true if the file was not opened. I don't see that your solution does anything other than narrow the check for all possible errors. – Retired Ninja Mar 17 '17 at 18:04

Error in file reading with ifstream

1 Answers1