检测文件是否存在于windows中。

bool DoesExistFile(std::wstring filePath)
{
    bool result = true;

    HANDLE fileHandle = CreateFile(
        filePath.c_str(),
        GENERIC_READ,
        0,
        NULL,
        OPEN_EXISTING,
        0,
        NULL);

    if ((fileHandle != NULL) && (fileHandle != INVALID_HANDLE_VALUE))
        CloseHandle(fileHandle);
    else
    {
        DWORD error = GetLastError();

        if ((error == ERROR_FILE_NOT_FOUND) || (error == ERROR_PATH_NOT_FOUND))
            result = false;
    }

    return result;
}

你可以使用std::ifstream，函数如is_open, fail，例如下面的代码(cout“open”表示文件是否存在):

引自以下答案

在c++ 17中:

#include <experimental/filesystem>

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

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.
}

这里有一个简单的例子!

#include <iostream>
#include <fstream>
using namespace std;
    
void main(){
   SearchFile("test.txt");
}

bool SearchFile(const char *file)
{
   ifstream infile(file);
   if (!infile.good())
   {
    // If file is not there
    exit(1);
   }
}

如果你需要区分一个文件和一个目录，考虑下面这两个都使用stat的最快标准工具，如PherricOxide所演示的:

#include <sys/stat.h>
int FileExists(char *path)
{
    struct stat fileStat; 
    if ( stat(path, &fileStat) )
    {
        return 0;
    }
    if ( !S_ISREG(fileStat.st_mode) )
    {
        return 0;
    }
    return 1;
}

int DirExists(char *path)
{
    struct stat fileStat;
    if ( stat(path, &fileStat) )
    {
        return 0;
    }
    if ( !S_ISDIR(fileStat.st_mode) )
    {
        return 0;
    }
    return 1;
}