如何在c++ (linux)中获取有文件名的文件的完整路径

#include <iostream>
#include <cstdlib>

int main() {
    const char* filename = "example.txt";
    char path[PATH_MAX];

    if (realpath(filename, path) != NULL) {
        std::cout << "Absolute path: " << path << std::endl;
    } else {
        std::cerr << "Failed to get absolute path." << std::endl;
    }

    return 0;
}

#include <iostream>
#include <cstdlib>
#include <unistd.h>

int main() {
    const char* filename = "example.txt";
    char path[PATH_MAX];

    if (readlink(filename, path, sizeof(path)) != -1) {
        std::cout << "Absolute path: " << path << std::endl;
    } else {
        std::cerr << "Failed to get absolute path." << std::endl;
    }

    return 0;
}