如何解决C++运行时错误：'file read/write error'？

#include <iostream>
#include <fstream>

int main() {
    std::ifstream file("example.txt");
    if (!file.is_open()) {
        std::cout << "File does not exist." << std::endl;
        // 创建新文件
        std::ofstream newFile("example.txt");
    }
    // 文件存在，继续读取或写入操作
    return 0;
}

#include <iostream>
#include <fstream>
#include <chrono>
#include <thread>

int main() {
    std::ofstream file("example.txt");
    if (!file.is_open()) {
        std::cout << "Failed to open file." << std::endl;
        return -1;
    }
    // 尝试写入文件，如果失败则等待1秒后再次尝试
    bool success = false;
    while (!success) {
        try {
            file << "Hello, world!" << std::endl;
            success = true;
        } catch (std::ofstream::failure e) {
            std::cout << "Unable to write to file." << std::endl;
            std::this_thread::sleep_for(std::chrono::seconds(1));
        }
    }
    // 写入成功后关闭文件
    file.close();

    return 0;
}

#include <iostream>
#include <fstream>
#include <sys/stat.h>

int main() {
    std::ofstream file("example.txt");
    if (!file.is_open()) {
        std::cout << "Failed to open file." << std::endl;
        return -1;
    }
    // 尝试写入文件，如果失败则更改文件权限
    bool success = false;
    while (!success) {
        try {
            file << "Hello, world!" << std::endl;
            success = true;
        } catch (std::ofstream::failure e) {
            std::cout << "Unable to write to file." << std::endl;
            // 更改文件权限
            chmod("example.txt", S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH);
        }
    }
    // 写入成功后关闭文件
    file.close();

    return 0;
}