CPP

check file exist cpp

#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); 
}

c++ check if file exits

#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";
   }
}

check if file exists c++

#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;
}

c++ file exists

/*-------------------------------------------------------------------
    Returns a boolean indicating whether a file exists 
-------------------------------------------------------------------*/
bool FileExists(string Filepath)
{
   struct stat buffer;
   return (stat (Filepath.c_str(), &buffer) == 0);
}

c++ how to check whether a file exists?

#include <filesystem>

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

check file exist cpp

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**