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c++ check if file exits

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White Spoonbill answered on November 24, 2020 Popularity 9/10 Helpfulness 5/10

answer c++ check if file exits

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c++ check if file exits

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#include <fstream>
#include<iostream>
using namespace std;
int main() {
   /* try to open file to read */
   ifstream ifile;
   ifile.open("b.txt");
   if(ifile) {
      cout<<"file exists";
   } else {
      cout<<"file doesn't exist";
   }
}

Popularity 9/10 Helpfulness 5/10 Language cpp

Source: www.tutorialspoint.com

Tags: c++ file

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Contributed on Jan 28 2021

White Spoonbill

0 Answers Avg Quality 2/10

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check file exist cpp

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#include <sys/stat.h>
#include <unistd.h>
#include <string>
#include <fstream>

inline bool exists_test0 (const std::string& name) {
    ifstream f(name.c_str());
    return f.good();
}

inline bool exists_test1 (const std::string& name) {
    if (FILE *file = fopen(name.c_str(), "r")) {
        fclose(file);
        return true;
    } else {
        return false;
    }   
}

inline bool exists_test2 (const std::string& name) {
    return ( access( name.c_str(), F_OK ) != -1 );
}

inline bool exists_test3 (const std::string& name) {
  struct stat buffer;   
  return (stat (name.c_str(), &buffer) == 0); 
}

Popularity 10/10 Helpfulness 7/10 Language cpp

Source: stackoverflow.com

Tags: c++

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Contributed on Nov 24 2020

Defeated Dingo

0 Answers Avg Quality 2/10

c++ how to check whether a file exists?

Comment

#include <filesystem>

void do_something()
{
 	if (std::filesystem::exists(FILE_PATH))
    {
     	std::cout << "yes, that file exists" << std::endl; 
    }
}

Popularity 9/10 Helpfulness 6/10 Language cpp

Source: Grepper

Tags: c++

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Contributed on Feb 03 2022

Four Striped Grass Mouse

0 Answers Avg Quality 2/10

check if file exists c++

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#include <iostream>
#include <fstream>
using namespace std;

int main()
{
    ifstream file("myfile.txt");
  
    if(!file) // checks the existence of file
        cout<< "file was not found ";
  	return 0;
}

Popularity 9/10 Helpfulness 5/10 Language typescript

Source: Grepper

Tags: c++ file-exists

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Contributed on Jun 12 2022

Sleep deprived

0 Answers Avg Quality 2/10

check file exist cpp

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Method exists_test0 (ifstream): **0.485s**
Method exists_test1 (FILE fopen): **0.302s**
Method exists_test2 (posix access()): **0.202s**
Method exists_test3 (posix stat()): **0.134s**

Popularity 9/10 Helpfulness 2/10 Language cpp

Source: stackoverflow.com

Tags: c++

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Contributed on Nov 24 2020

Defeated Dingo

0 Answers Avg Quality 2/10

c++ check if file exits

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check file exist cpp

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