opening without exists Fastest way to check if a file exist using standard C++/C++11/C?




8 Answers

I use this piece of code, it works OK with me so far. This does not use many fancy features of C++:

bool is_file_exist(const char *fileName)
{
    std::ifstream infile(fileName);
    return infile.good();
}
c++ ifstream check if file exists

I would like to find the fastest way to check if a file exist in standard C++11, C++, or C. I have thousands of files and before doing something on them I need to check if all of them exist. What can I write instead of /* SOMETHING */ in the following function?

inline bool exist(const std::string& name)
{
    /* SOMETHING */
}



It depends on where the files reside. For instance, if they are all supposed to be in the same directory, you can read all the directory entries into a hash table and then check all the names against the hash table. This might be faster on some systems than checking each file individually. The fastest way to check each file individually depends on your system ... if you're writing ANSI C, the fastest way is fopen because it's the only way (a file might exist but not be openable, but you probably really want openable if you need to "do something on it"). C++, POSIX, Windows all offer additional options.

While I'm at it, let me point out some problems with your question. You say that you want the fastest way, and that you have thousands of files, but then you ask for the code for a function to test a single file (and that function is only valid in C++, not C). This contradicts your requirements by making an assumption about the solution ... a case of the XY problem. You also say "in standard c++11(or)c++(or)c" ... which are all different, and this also is inconsistent with your requirement for speed ... the fastest solution would involve tailoring the code to the target system. The inconsistency in the question is highlighted by the fact that you accepted an answer that gives solutions that are system-dependent and are not standard C or C++.




Without using other libraries, I like to use the following code snippet:

#ifdef _WIN32
   #include <io.h> 
   #define access    _access_s
#else
   #include <unistd.h>
#endif

bool FileExists( const std::string &Filename )
{
    return access( Filename.c_str(), 0 ) == 0;
}

This works cross-platform for Windows and POSIX-compliant systems.




inline bool exist(const std::string& name)
{
    ifstream file(name);
    if(!file)            // If the file was not found, then file is 0, i.e. !file=1 or true.
        return false;    // The file was not found.
    else                 // If the file was found, then file is non-0.
        return true;     // The file was found.
}



You may also do bool b = std::ifstream('filename').good();. Without the branch instructions(like if) it must perform faster as it needs to be called thousands of times.




all_of (begin(R), end(R), [](auto&p){ exists(p); })

where R is your sequence of path-like things, and exists() is from the future std or current boost. If you roll your own, keep it simple,

bool exists (string const& p) { return ifstream{p}; }

The branched solution isn't absolutely terrible and it won't gobble file descriptors,

bool exists (const char* p) {
    #if defined(_WIN32) || defined(_WIN64)
    return p && 0 != PathFileExists (p);
    #else
    struct stat sb;
    return p && 0 == stat (p, &sb);
    #endif
}



You can use std::ifstream, funcion like is_open, fail, for example as below code (the cout "open" means file exist or not):

cited from this answer




In C++17 :

#include <experimental/filesystem>

bool is_file_exist(std::string& str) {   
    namespace fs = std::experimental::filesystem;
    fs::path p(str);
    return fs::exists(p);
}



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